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PSoC 4: The Auto Ranging Multi-Meter

About the project

An auto ranging meter with diode/LED, resistance, capacitance, continuity testing capabilities. No Voltage or Current measurements !

Project info

Difficulty: Moderate

Platforms: Adafruit, Cypress, SparkFun

Estimated time: 1 hour

License: GNU General Public License, version 3 or later (GPL3+)

Items used in this project

Hardware components

	Sparkfun Capacitor Kit	x 1
	Tiny Breadboard	x 1
	Tiny Breadboard	x 1
	Tiny Breadboard	x 1
	Jumper Wire Kit - 140pcs	x 1

Software apps and online services

Cypress PSoC Creator

Hand tools and fabrication machines

Soldering iron (generic)

x 1

Story

Meters are Meters!

For someone who is a hobbyist/pro-developer/engineer, it never hurts to have a spare meter! This is the story of a hobby meter, named DRCC meter. DRCC stands for Diode Resistance Capacitance and Continuity testing meter.

Features

Auto ranging resistance measure: 10 Ohms - 500 kOhms
Auto ranging fast capacitance measure: 1 uF - 4000 uF
Diode/LED with forward voltage drop: < 2.0 Volts
Continuity of circuit trace/wire < 100 Ohms
Fast update
Capable of measuring big caps
Cool icons for components

All Options

Simple Hardware & Working Principles

The hardware is very simple. Just a PSoC 4 4$ kit on a breadboard, few resistors, a buzzer, a 20x4 LCD Character display and 2 connecting probe!

Resistance

From Ohms law V = I * R or R = V/I, injecting known I value and measuring the V with ADC, resistance R can be calculated. The current injection is done in PSoC 4 using IDAC module. Details explained Here from a old project with just resistance measurement capability.

Capacitance

As for Capacitance, C = Q * V, means Capacitance is equal to Charge Q stored in a capacitor times Voltage build up across capacitor terminals. Again, Charge Q = I * t, meaning Current times Time is Charge. Now, injecting a known current for a known time, total charge stored can be calculated. During this charge storage voltage V will build up which is measured using ADC. Finally, capacitance can be measured from multiplying all the measured value C = V * I * t .

1 / 2 • Measuring big caps

Continuity

Continuity of any electrical path means Low Resistance. It can be measured in the same way resistance measurement.

Diode/LED

Diodes exhibit a forward voltage drop known as knee voltage where diode voltage pretty much locks up. By applying full IDAC current through diode or LED this voltage drop can be reached. Next the ADC is used to measure up the FW voltage drop. If there is 0 Volt drop means the diode is Bad/Short.

Diode Test

What is IDAC?

IDAC is a Digital to Analog Converter Current Source. It can source/sink of current which is programmable.

IDAC can be shorted to Ground or V supply, without any harm
IDAC pin goes to 5 volt when set current can not flow through load
IDAC consumes Analog Routing/paths inside PSoC
IDAC has current step of 1.2 uA or 2.4 uA
IDAC current step current's Integer Multiple in 7/8 bit can be programmed

Magical Firmware

The PSoC Creator (version 3.1 used) is a magical firmware allows to add the cool components and wire up internally the hardware parts, so the complication on external hardware is minimized.

An ADC (12 bit) is used to measure, an IDAC (8 bit) is used to inject known test current to external components, timer to keep track of elapsed test time, LCD component drives the display with breeze, few GPIO pins to change options and press indication on LED. Measurement and current inject is done with an analog pin.

1 / 2 • PSoC Internal Schematics

PSoC Components Configuration

1 / 4 • ADC Settings

LCD icons for ohms, resistor, capacitor, diode etc are made using custom fonts as follows in the LCD component.

Graphical Icons

LCD is connected to Port 0 Pins: 0-7 as per following table from datasheet:

PSoC to LCD Hardware wiring

Schematics, diagrams and documents

Device Pin Map

CY8C049 , PSoC 4 CY4245AXI083

Code

PSoC Creator Files

Full Code

Download

main.c

Codes

#include <project.h>

volatile uint32_t us_10=0;  // 10 uSec variable
int current =0;
int voltage =0;
int resistance=0;
uint32_t IDAC_Val=0xff;
int c=4095;    
int j=0; //use as loop counter
int mode =1;

CY_ISR(Timing_ISR_Handler)
{
    us_10++;
    Timer_ClearInterrupt(Timer_TC_INTERRUPT_MASK);

}


uint8_t  sine_wave[256] = {
  0x80, 0x83, 0x86, 0x89, 0x8C, 0x90, 0x93, 0x96,
  0x99, 0x9C, 0x9F, 0xA2, 0xA5, 0xA8, 0xAB, 0xAE,
  0xB1, 0xB3, 0xB6, 0xB9, 0xBC, 0xBF, 0xC1, 0xC4,
  0xC7, 0xC9, 0xCC, 0xCE, 0xD1, 0xD3, 0xD5, 0xD8,
  0xDA, 0xDC, 0xDE, 0xE0, 0xE2, 0xE4, 0xE6, 0xE8,
  0xEA, 0xEB, 0xED, 0xEF, 0xF0, 0xF1, 0xF3, 0xF4,
  0xF5, 0xF6, 0xF8, 0xF9, 0xFA, 0xFA, 0xFB, 0xFC,
  0xFD, 0xFD, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
  0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFE, 0xFE, 0xFD,
  0xFD, 0xFC, 0xFB, 0xFA, 0xFA, 0xF9, 0xF8, 0xF6,
  0xF5, 0xF4, 0xF3, 0xF1, 0xF0, 0xEF, 0xED, 0xEB,
  0xEA, 0xE8, 0xE6, 0xE4, 0xE2, 0xE0, 0xDE, 0xDC,
  0xDA, 0xD8, 0xD5, 0xD3, 0xD1, 0xCE, 0xCC, 0xC9,
  0xC7, 0xC4, 0xC1, 0xBF, 0xBC, 0xB9, 0xB6, 0xB3,
  0xB1, 0xAE, 0xAB, 0xA8, 0xA5, 0xA2, 0x9F, 0x9C,
  0x99, 0x96, 0x93, 0x90, 0x8C, 0x89, 0x86, 0x83,
  0x80, 0x7D, 0x7A, 0x77, 0x74, 0x70, 0x6D, 0x6A,
  0x67, 0x64, 0x61, 0x5E, 0x5B, 0x58, 0x55, 0x52,
  0x4F, 0x4D, 0x4A, 0x47, 0x44, 0x41, 0x3F, 0x3C,
  0x39, 0x37, 0x34, 0x32, 0x2F, 0x2D, 0x2B, 0x28,
  0x26, 0x24, 0x22, 0x20, 0x1E, 0x1C, 0x1A, 0x18,
  0x16, 0x15, 0x13, 0x11, 0x10, 0x0F, 0x0D, 0x0C,
  0x0B, 0x0A, 0x08, 0x07, 0x06, 0x06, 0x05, 0x04,
  0x03, 0x03, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01,
  0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x03,
  0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x0A,
  0x0B, 0x0C, 0x0D, 0x0F, 0x10, 0x11, 0x13, 0x15,
  0x16, 0x18, 0x1A, 0x1C, 0x1E, 0x20, 0x22, 0x24,
  0x26, 0x28, 0x2B, 0x2D, 0x2F, 0x32, 0x34, 0x37,
  0x39, 0x3C, 0x3F, 0x41, 0x44, 0x47, 0x4A, 0x4D,
  0x4F, 0x52, 0x55, 0x58, 0x5B, 0x5E, 0x61, 0x64,
  0x67, 0x6A, 0x6D, 0x70, 0x74, 0x77, 0x7A, 0x7D
};


void measure_resistance(void);
void measure_continuity(void);
void measure_capacitance(void);
void measure_diode(void);
void measure_inductance(void);


void res_mode(void)
{
        
}
/////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////// MAIN LOOP /////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////
int main()
{   
    LCD_Start();
    ADC_Start();
    IDAC_Start();
    Timer_Start();
    Timing_ISR_StartEx(Timing_ISR_Handler);
//    CyGlobalIntEnable;
    mode=1;
    IDAC_SetValue(IDAC_Val);
    ADC_StartConvert();
    LCD_Position(1,0);LCD_PrintString(" ! PSoC Auto Range !");
    LCD_Position(2,0);LCD_PrintString("***   LRC Meter  ***");
    CyDelay(2000);
    LCD_ClearDisplay();

    
    for(;;)
    {
    measure_capacitance();
    measure_resistance();
    measure_continuity();
    measure_diode();
        if (mode>4) {mode=1;}
    
  
    } ///////////////////////// Forever for loop ends here /////////////////////////////////*/

} ///////////////////=========== main loop Ends Here ===============/////////////////////////





///////////////////////////// FUNCTIONS BODY /////////////////////////////
void measure_resistance()
{
     IDAC_Start();
    unsigned long R=0;
    while (mode==1)
    {
    Buzzer_Write(0);
    IDAC_Val=0xff;
    c=4095;
    
        while((IDAC_Val>0)&&(c>=4000))
        {
    
        IDAC_Val=IDAC_Val-0x01;
        IDAC_SetValue(IDAC_Val);
        CyDelay(3);
        while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
        c=ADC_GetResult16(0);
        CyDelay(2);
        }   
        
        if (c<4000)
        {
            
            IDAC_SetValue(IDAC_Val);      
            CyDelay(1);
            current= IDAC_Val*1.2;   // in uAmp
            voltage=c*1000/2;        // in uVolt
            resistance = voltage/current;  // Ohms Law to calculate resistanc
            resistance = resistance - 148; // offsetting internal trace resistance of 150 ohms per trace
                
                if (resistance<=0) {resistance = 0;}                  // omitting any negative value
                if (resistance>5000) {resistance = resistance*1.05;} // soft correction to reduce error
                
              LCD_ClearDisplay();
                // 500K IS THE LIMIT FOR RESISTANCE 
             if (resistance<500000)
             {
              //  Show Result on LCD  //     
              LCD_Position(0,0); LCD_PrintString("*  RESISTANCE MODE *");      
              LCD_Position(1,6);LCD_PrintString("o_");LCD_PutChar(LCD_CUSTOM_2);LCD_PutChar(LCD_CUSTOM_3);
              LCD_PutChar(LCD_CUSTOM_2);LCD_PutChar(LCD_CUSTOM_3);LCD_PrintString("_o");
              LCD_Position(2,5); LCD_PrintU32Number(resistance);
              LCD_PrintString(" ");LCD_PutChar(LCD_CUSTOM_0);
              LCD_Position(3,5);LCD_PrintU32Number(resistance/1000);
                    if(resistance%1000>=100)LCD_PrintString(".");
                    else if(resistance%1000>=10)LCD_PrintString(".0");
                    else if(resistance%1000<10)LCD_PrintString(".00");
              LCD_PrintU32Number(resistance%1000);
              LCD_PrintString(" k");
              LCD_PutChar(LCD_CUSTOM_0);
              CyDelay(100); 
             }
            
            else 
             {
              LCD_Position(0,0);LCD_PrintString("*  RESISTANCE MODE *");                      
              LCD_Position(1,6);LCD_PrintString("o_    _o");         
              LCD_Position(2,0); LCD_PrintString("No Resistor Detected");
              LCD_Position(3,0); LCD_PrintString(" Connect Resistor !!");
              CyDelay(100);
              }
            

        
        CyDelay(100);
        // mode exit if user press switch     
            if(LED_Read()==1){mode++;}
        }
        
     
    }
}


void measure_capacitance()
{
   
    while (mode==2)
    {
     // Timer_WritePeriod(10);
        IDAC_Stop();
          while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
          c=ADC_GetResult16(0);
   
        LCD_ClearDisplay();
        LCD_Position(0,0);
        LCD_PrintString("* CAPACITANCE MODE *");
        LCD_Position(1,2);
        LCD_PrintString("(+) o--  --o (-)");

        IDAC_Start();
        IDAC_Val=100;
        IDAC_SetValue(IDAC_Val);// times 1.2 uA times CHARGE TIME is Q Coulomb charge
   
        int k=0;
        uint16 ADC_Level = 2048 ; // caps will charge through IDAC current upto this level
            while(c<ADC_Level)
            {
                if(k==0) // One time loop 
                {
                LCD_Position(0,0);LCD_PrintString("* CAPACITANCE MODE *");
                LCD_Position(1,2);LCD_PrintString("(+) o--");LCD_PutChar(LCD_CUSTOM_6);
                LCD_PutChar(LCD_CUSTOM_5);LCD_PrintString("--o (-)");

                LCD_Position(2,0);LCD_PrintString("   Measuring.....");
                k++;CyGlobalIntDisable; us_10=0;CyGlobalIntEnable;
                }
                // ADC is measuring voltage across capacitor
                while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}  
                c=ADC_GetResult16(0);
    
            }
    
        CyGlobalIntDisable;  // disabling interrupt to stop updating time
        IDAC_SetValue(0x00); // IDAC current is set 0
        IDAC_Stop();         // IDAC is stopped
        LCD_ClearDisplay();
        
        // Using C = Q/V = I*t/V formula, Capacitance will be calculated and displayed 
                while(c>256)
                {     
                LCD_Position(0,0); LCD_PrintString("* CAPACITANCE MODE *");        
        // Calculation Below //
                
                //  float Charge = IDAC_Val*1.2; // 1.2 uA is the step current               
                //  uint32 Time = us_10/100;  // microsec to milisec
                //  float Volt = ADC_Level/2.0;
                //  Approx Timing Correction for Execution Delay by adding 20% to calculated value (1.2 times)
                
                double nFCaptemp =  1000*1.2*((IDAC_Val*1.2*us_10/100.0)/(ADC_Level/2.0));
                uint32 nFCap = nFCaptemp;
                uint32 Capacitance = nFCap/1000;
              
        
        // Displaying Capacitacne on LCD //
                LCD_Position(1,2);LCD_PrintString("(+) o--  --o (-)");
              //  LCD_PrintString("(+) o--");LCD_PutChar(LCD_CUSTOM_6);LCD_PutChar(LCD_CUSTOM_5);LCD_PrintString("--o (-)");  
                LCD_Position(2,7); LCD_PrintU32Number(Capacitance);LCD_PrintString(" uF ");
                LCD_Position(3,7);; LCD_PrintU32Number(nFCap);LCD_PrintString(" nF ");
    
                CyDelay(500);
                
                // Checks for presence of Capacitance connected to Probe //
                while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                c=ADC_GetResult16(0);

                }
        LCD_ClearDisplay();
        // mode exit if user press switch
        if(LED_Read()==1){mode++;}
        
        
    } 

}



void measure_continuity()
{
    IDAC_Start();
    LCD_ClearDisplay(); 
              //  Show Result on LCD  //     
    LCD_Position(0,0);LCD_PrintString("*  CONTINUITY MODE *");                      
    LCD_Position(1,6);LCD_PrintString("o-    -o");         
    LCD_Position(2,0); LCD_PrintString("   Continuity....  ");
    LCD_Position(3,0); LCD_PrintString("   Not Detected !!  ");
              
    Buzzer_Write(0);
    IDAC_Val=100;
    IDAC_SetValue(IDAC_Val);
    c=100;
    CyDelay(1000);
     while (mode==3)
    {
        
                if (c<50)
              { 
                  while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                  c=ADC_GetResult16(0);
                  CyDelay(10);
              LCD_ClearDisplay();
              //  Show Result on LCD  //     
              LCD_Position(0,0); LCD_PrintString("*  CONTINUITY MODE *");      
              LCD_Position(1,6);LCD_PrintString("o------o");
              LCD_Position(2,0); LCD_PrintString("   Continuity....  ");
              LCD_Position(3,0); LCD_PrintString("      Detected !!  ");
              Buzzer_Write(1);
              CyDelay(20); 
             }
            
              if (c>50)  
              {
                    while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                    c=ADC_GetResult16(0);
                    CyDelay(10);
              LCD_ClearDisplay(); 
              //  Show Result on LCD  //     
              LCD_Position(0,0);LCD_PrintString("*  CONTINUITY MODE *");                      
              LCD_Position(1,6);LCD_PrintString("o-    -o");         
              LCD_Position(2,0); LCD_PrintString("   Continuity....  ");
              LCD_Position(3,0); LCD_PrintString("   Not Detected !!  ");
              Buzzer_Write(0);
              CyDelay(20);
              }
            

        
        CyDelay(20);
        // mode exit if user press switch     
                  if(LED_Read()==1){mode++;Buzzer_Write(0);}
        
        
     
    }
    
}

//////// diode ///////////////
void measure_diode()
{
    IDAC_Start();
    LCD_ClearDisplay(); 
              //  Show Result on LCD  //     
    LCD_Position(0,0);LCD_PrintString("*    DIODE MODE    *");                      
    LCD_Position(1,6);LCD_PrintString("o--  --o");         
    LCD_Position(2,0); LCD_PrintString("   Diode/LED  ....  ");
    LCD_Position(3,0); LCD_PrintString("   Not Detected !!  ");
              
    Buzzer_Write(0);
    IDAC_Val=255;
    IDAC_SetValue(IDAC_Val);
    c=100;
    CyDelay(1000);
     while (mode==4)
    {
        
                if (c>3850)
              { 
                  while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                  c=ADC_GetResult16(0);
                  CyDelay(10);
              LCD_ClearDisplay();
              //  Show Result on LCD  //     
                LCD_Position(0,0);LCD_PrintString("*    DIODE MODE    *");                      
                LCD_Position(1,6);LCD_PrintString("o--  --o");         
                LCD_Position(2,0); LCD_PrintString("   Diode/LED  ....  ");
                LCD_Position(3,0); LCD_PrintString("   Not Detected !!  ");
              Buzzer_Write(0);
              CyDelay(200); 
             }
            
              if (c<3850)  
              {
                    while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                    c=ADC_GetResult16(0);
                    CyDelay(10);
              LCD_ClearDisplay(); 
              //  Show Result on LCD  //     
               LCD_Position(0,0);LCD_PrintString("*    DIODE MODE    *");                      
               LCD_Position(1,6);LCD_PrintString("o--");
               LCD_PutChar(LCD_CUSTOM_6);LCD_PutChar(LCD_CUSTOM_4);LCD_PrintString("--o");         
               LCD_Position(2,0); LCD_PrintString("Diode/LED Detected !");
               LCD_Position(3,1); LCD_PrintString("V_fd = ");
               int vfd = c/2; // in mV
               LCD_PrintU32Number(vfd/1000);
                    if(vfd%1000>=100)LCD_PrintString(".");
                    else if(vfd%1000>=10)LCD_PrintString(".0");
                    else if(vfd%1000<10)LCD_PrintString(".00");
              LCD_PrintU32Number(vfd%1000);
              LCD_PrintString(" Volt");
               
            Buzzer_Write(1);
            CyDelay(10);
            Buzzer_Write(0);
              CyDelay(200);
              }
            

        
        CyDelay(20);
        // mode exit if user press switch     
                  if(LED_Read()==1){mode++;Buzzer_Write(0);}
        
        
     
    }
    
}


//////////////////////

void ind_mode(void)
{
    LCD_Position(0,0);
    LCD_PrintString("* INDUCTANCE  MODE *");
    
    LCD_Position(1,6);
        LCD_Position(1,6);
        LCD_PrintString("o-");LCD_PutChar(LCD_CUSTOM_7);LCD_PutChar(LCD_CUSTOM_7);
        LCD_PutChar(LCD_CUSTOM_7);LCD_PutChar(LCD_CUSTOM_7);LCD_PrintString("-o");
    LCD_Position(2,0); LCD_PrintString("  Program for      ");
    LCD_Position(3,0); LCD_PrintString("      SINE Wave  ");    
    CyDelay(100);
    while(mode==3)
    {
      int i=0;
        for(i=0;i<255;i=i+8)
        {
   IDAC_SetValue(sine_wave[i]); // feed from a lookuo table
         }     
     if(LED_Read()==1) {mode++;}// EXIT COND
  
        }
    
    
}

Code Ver 1.5

Capacitance, Resistance, Diode/Continuity Ok

#include <project.h>

volatile uint32_t us_10=0;  // 10 uSec variable
int current =0;
int voltage =0;
int resistance=0;
uint32_t IDAC_Val=0xff;
int c=4095;    
int j=0; //use as loop counter
int mode =1;

CY_ISR(Timing_ISR_Handler)
{
    us_10++;
    Timer_ClearInterrupt(Timer_TC_INTERRUPT_MASK);

}


uint8_t  sine_wave[256] = {
  0x80, 0x83, 0x86, 0x89, 0x8C, 0x90, 0x93, 0x96,
  0x99, 0x9C, 0x9F, 0xA2, 0xA5, 0xA8, 0xAB, 0xAE,
  0xB1, 0xB3, 0xB6, 0xB9, 0xBC, 0xBF, 0xC1, 0xC4,
  0xC7, 0xC9, 0xCC, 0xCE, 0xD1, 0xD3, 0xD5, 0xD8,
  0xDA, 0xDC, 0xDE, 0xE0, 0xE2, 0xE4, 0xE6, 0xE8,
  0xEA, 0xEB, 0xED, 0xEF, 0xF0, 0xF1, 0xF3, 0xF4,
  0xF5, 0xF6, 0xF8, 0xF9, 0xFA, 0xFA, 0xFB, 0xFC,
  0xFD, 0xFD, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
  0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFE, 0xFE, 0xFD,
  0xFD, 0xFC, 0xFB, 0xFA, 0xFA, 0xF9, 0xF8, 0xF6,
  0xF5, 0xF4, 0xF3, 0xF1, 0xF0, 0xEF, 0xED, 0xEB,
  0xEA, 0xE8, 0xE6, 0xE4, 0xE2, 0xE0, 0xDE, 0xDC,
  0xDA, 0xD8, 0xD5, 0xD3, 0xD1, 0xCE, 0xCC, 0xC9,
  0xC7, 0xC4, 0xC1, 0xBF, 0xBC, 0xB9, 0xB6, 0xB3,
  0xB1, 0xAE, 0xAB, 0xA8, 0xA5, 0xA2, 0x9F, 0x9C,
  0x99, 0x96, 0x93, 0x90, 0x8C, 0x89, 0x86, 0x83,
  0x80, 0x7D, 0x7A, 0x77, 0x74, 0x70, 0x6D, 0x6A,
  0x67, 0x64, 0x61, 0x5E, 0x5B, 0x58, 0x55, 0x52,
  0x4F, 0x4D, 0x4A, 0x47, 0x44, 0x41, 0x3F, 0x3C,
  0x39, 0x37, 0x34, 0x32, 0x2F, 0x2D, 0x2B, 0x28,
  0x26, 0x24, 0x22, 0x20, 0x1E, 0x1C, 0x1A, 0x18,
  0x16, 0x15, 0x13, 0x11, 0x10, 0x0F, 0x0D, 0x0C,
  0x0B, 0x0A, 0x08, 0x07, 0x06, 0x06, 0x05, 0x04,
  0x03, 0x03, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01,
  0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x03,
  0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x0A,
  0x0B, 0x0C, 0x0D, 0x0F, 0x10, 0x11, 0x13, 0x15,
  0x16, 0x18, 0x1A, 0x1C, 0x1E, 0x20, 0x22, 0x24,
  0x26, 0x28, 0x2B, 0x2D, 0x2F, 0x32, 0x34, 0x37,
  0x39, 0x3C, 0x3F, 0x41, 0x44, 0x47, 0x4A, 0x4D,
  0x4F, 0x52, 0x55, 0x58, 0x5B, 0x5E, 0x61, 0x64,
  0x67, 0x6A, 0x6D, 0x70, 0x74, 0x77, 0x7A, 0x7D
};


void measure_resistance(void);
void measure_continuity(void);
void measure_capacitance(void);
void measure_diode(void);
void measure_inductance(void);


void res_mode(void)
{
        
}
/////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////// MAIN LOOP /////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////
int main()
{   
    LCD_Start();
    ADC_Start();
    IDAC_Start();
    Timer_Start();
    Timing_ISR_StartEx(Timing_ISR_Handler);
//    CyGlobalIntEnable;
    mode=1;
    IDAC_SetValue(IDAC_Val);
    ADC_StartConvert();
    LCD_Position(1,0);LCD_PrintString(" ! PSoC Auto Range !");
    LCD_Position(2,0);LCD_PrintString("***   LRC Meter  ***");
    CyDelay(2000);
    LCD_ClearDisplay();

    
    for(;;)
    {
    measure_capacitance();
    measure_resistance();
    measure_continuity();
    measure_diode();
        if (mode>4) {mode=1;}
    
  
    } ///////////////////////// Forever for loop ends here /////////////////////////////////*/

} ///////////////////=========== main loop Ends Here ===============/////////////////////////





///////////////////////////// FUNCTIONS BODY /////////////////////////////
void measure_resistance()
{
     IDAC_Start();
    unsigned long R=0;
    while (mode==1)
    {
    Buzzer_Write(0);
    IDAC_Val=0xff;
    c=4095;
    
        while((IDAC_Val>0)&&(c>=4000))
        {
    
        IDAC_Val=IDAC_Val-0x01;
        IDAC_SetValue(IDAC_Val);
        CyDelay(3);
        while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
        c=ADC_GetResult16(0);
        CyDelay(2);
        }   
        
        if (c<4000)
        {
            
            IDAC_SetValue(IDAC_Val);      
            CyDelay(1);
            current= IDAC_Val*1.2;   // in uAmp
            voltage=c*1000/2;        // in uVolt
            resistance = voltage/current;  // Ohms Law to calculate resistanc
            resistance = resistance - 148; // offsetting internal trace resistance of 150 ohms per trace
                
                if (resistance<=0) {resistance = 0;}                  // omitting any negative value
                if (resistance>5000) {resistance = resistance*1.05;} // soft correction to reduce error
                
              LCD_ClearDisplay();
                // 500K IS THE LIMIT FOR RESISTANCE 
             if (resistance<500000)
             {
              //  Show Result on LCD  //     
              LCD_Position(0,0); LCD_PrintString("*  RESISTANCE MODE *");      
              LCD_Position(1,6);LCD_PrintString("o_");LCD_PutChar(LCD_CUSTOM_2);LCD_PutChar(LCD_CUSTOM_3);
              LCD_PutChar(LCD_CUSTOM_2);LCD_PutChar(LCD_CUSTOM_3);LCD_PrintString("_o");
              LCD_Position(2,5); LCD_PrintU32Number(resistance);
              LCD_PrintString(" ");LCD_PutChar(LCD_CUSTOM_0);
              LCD_Position(3,5);LCD_PrintU32Number(resistance/1000);
                    if(resistance%1000>=100)LCD_PrintString(".");
                    else if(resistance%1000>=10)LCD_PrintString(".0");
                    else if(resistance%1000<10)LCD_PrintString(".00");
              LCD_PrintU32Number(resistance%1000);
              LCD_PrintString(" k");
              LCD_PutChar(LCD_CUSTOM_0);
              CyDelay(100); 
             }
            
            else 
             {
              LCD_Position(0,0);LCD_PrintString("*  RESISTANCE MODE *");                      
              LCD_Position(1,6);LCD_PrintString("o_    _o");         
              LCD_Position(2,0); LCD_PrintString("No Resistor Detected");
              LCD_Position(3,0); LCD_PrintString(" Connect Resistor !!");
              CyDelay(100);
              }
            

        
        CyDelay(100);
        // mode exit if user press switch     
            if(LED_Read()==1){mode++;}
        }
        
     
    }
}


void measure_capacitance()
{
   
    while (mode==2)
    {
     // Timer_WritePeriod(10);
        IDAC_Stop();
          while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
          c=ADC_GetResult16(0);
   
        LCD_ClearDisplay();
        LCD_Position(0,0);
        LCD_PrintString("* CAPACITANCE MODE *");
        LCD_Position(1,2);
        LCD_PrintString("(+) o--  --o (-)");

        IDAC_Start();
        IDAC_Val=100;
        IDAC_SetValue(IDAC_Val);// times 1.2 uA times CHARGE TIME is Q Coulomb charge
   
        int k=0;
        uint16 ADC_Level = 2048 ; // caps will charge through IDAC current upto this level
            while(c<ADC_Level)
            {
                if(k==0) // One time loop 
                {
                LCD_Position(0,0);LCD_PrintString("* CAPACITANCE MODE *");
                LCD_Position(1,2);LCD_PrintString("(+) o--");LCD_PutChar(LCD_CUSTOM_6);
                LCD_PutChar(LCD_CUSTOM_5);LCD_PrintString("--o (-)");

                LCD_Position(2,0);LCD_PrintString("   Measuring.....");
                k++;CyGlobalIntDisable; us_10=0;CyGlobalIntEnable;
                }
                // ADC is measuring voltage across capacitor
                while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}  
                c=ADC_GetResult16(0);
    
            }
    
        CyGlobalIntDisable;  // disabling interrupt to stop updating time
        IDAC_SetValue(0x00); // IDAC current is set 0
        IDAC_Stop();         // IDAC is stopped
        LCD_ClearDisplay();
        
        // Using C = Q/V = I*t/V formula, Capacitance will be calculated and displayed 
                while(c>256)
                {     
                LCD_Position(0,0); LCD_PrintString("* CAPACITANCE MODE *");        
        // Calculation Below //
                
                //  float Charge = IDAC_Val*1.2; // 1.2 uA is the step current               
                //  uint32 Time = us_10/100;  // microsec to milisec
                //  float Volt = ADC_Level/2.0;
                //  Approx Timing Correction for Execution Delay by adding 20% to calculated value (1.2 times)
                
                double nFCaptemp =  1000*1.2*((IDAC_Val*1.2*us_10/100.0)/(ADC_Level/2.0));
                uint32 nFCap = nFCaptemp;
                uint32 Capacitance = nFCap/1000;
              
        
        // Displaying Capacitacne on LCD //
                LCD_Position(1,2);LCD_PrintString("(+) o--  --o (-)");
              //  LCD_PrintString("(+) o--");LCD_PutChar(LCD_CUSTOM_6);LCD_PutChar(LCD_CUSTOM_5);LCD_PrintString("--o (-)");  
                LCD_Position(2,7); LCD_PrintU32Number(Capacitance);LCD_PrintString(" uF ");
                LCD_Position(3,7);; LCD_PrintU32Number(nFCap);LCD_PrintString(" nF ");
    
                CyDelay(500);
                
                // Checks for presence of Capacitance connected to Probe //
                while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                c=ADC_GetResult16(0);

                }
        LCD_ClearDisplay();
        // mode exit if user press switch
        if(LED_Read()==1){mode++;}
        
        
    } 

}



void measure_continuity()
{
    IDAC_Start();
    LCD_ClearDisplay(); 
              //  Show Result on LCD  //     
    LCD_Position(0,0);LCD_PrintString("*  CONTINUITY MODE *");                      
    LCD_Position(1,6);LCD_PrintString("o-    -o");         
    LCD_Position(2,0); LCD_PrintString("   Continuity....  ");
    LCD_Position(3,0); LCD_PrintString("   Not Detected !!  ");
              
    Buzzer_Write(0);
    IDAC_Val=100;
    IDAC_SetValue(IDAC_Val);
    c=100;
    CyDelay(1000);
     while (mode==3)
    {
        
                if (c<50)
              { 
                  while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                  c=ADC_GetResult16(0);
                  CyDelay(10);
              LCD_ClearDisplay();
              //  Show Result on LCD  //     
              LCD_Position(0,0); LCD_PrintString("*  CONTINUITY MODE *");      
              LCD_Position(1,6);LCD_PrintString("o------o");
              LCD_Position(2,0); LCD_PrintString("   Continuity....  ");
              LCD_Position(3,0); LCD_PrintString("      Detected !!  ");
              Buzzer_Write(1);
              CyDelay(20); 
             }
            
              if (c>50)  
              {
                    while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                    c=ADC_GetResult16(0);
                    CyDelay(10);
              LCD_ClearDisplay(); 
              //  Show Result on LCD  //     
              LCD_Position(0,0);LCD_PrintString("*  CONTINUITY MODE *");                      
              LCD_Position(1,6);LCD_PrintString("o-    -o");         
              LCD_Position(2,0); LCD_PrintString("   Continuity....  ");
              LCD_Position(3,0); LCD_PrintString("   Not Detected !!  ");
              Buzzer_Write(0);
              CyDelay(20);
              }
            

        
        CyDelay(20);
        // mode exit if user press switch     
                  if(LED_Read()==1){mode++;Buzzer_Write(0);}
        
        
     
    }
    
}

//////// diode ///////////////
void measure_diode()
{
    IDAC_Start();
    LCD_ClearDisplay(); 
              //  Show Result on LCD  //     
    LCD_Position(0,0);LCD_PrintString("*    DIODE MODE    *");                      
    LCD_Position(1,6);LCD_PrintString("o--  --o");         
    LCD_Position(2,0); LCD_PrintString("   Diode/LED  ....  ");
    LCD_Position(3,0); LCD_PrintString("   Not Detected !!  ");
              
    Buzzer_Write(0);
    IDAC_Val=255;
    IDAC_SetValue(IDAC_Val);
    c=100;
    CyDelay(1000);
     while (mode==4)
    {
        
                if (c>3850)
              { 
                  while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                  c=ADC_GetResult16(0);
                  CyDelay(10);
              LCD_ClearDisplay();
              //  Show Result on LCD  //     
                LCD_Position(0,0);LCD_PrintString("*    DIODE MODE    *");                      
                LCD_Position(1,6);LCD_PrintString("o--  --o");         
                LCD_Position(2,0); LCD_PrintString("   Diode/LED  ....  ");
                LCD_Position(3,0); LCD_PrintString("   Not Detected !!  ");
              Buzzer_Write(0);
              CyDelay(200); 
             }
            
              if (c<3850)  
              {
                    while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                    c=ADC_GetResult16(0);
                    CyDelay(10);
              LCD_ClearDisplay(); 
              //  Show Result on LCD  //     
               LCD_Position(0,0);LCD_PrintString("*    DIODE MODE    *");                      
               LCD_Position(1,6);LCD_PrintString("o--");
               LCD_PutChar(LCD_CUSTOM_6);LCD_PutChar(LCD_CUSTOM_4);LCD_PrintString("--o");         
               LCD_Position(2,0); LCD_PrintString("Diode/LED Detected !");
               LCD_Position(3,1); LCD_PrintString("V_fd = ");
               int vfd = c/2; // in mV
               LCD_PrintU32Number(vfd/1000);
                    if(vfd%1000>=100)LCD_PrintString(".");
                    else if(vfd%1000>=10)LCD_PrintString(".0");
                    else if(vfd%1000<10)LCD_PrintString(".00");
              LCD_PrintU32Number(vfd%1000);
              LCD_PrintString(" Volt");
               
            Buzzer_Write(1);
            CyDelay(10);
            Buzzer_Write(0);
              CyDelay(200);
              }
            

        
        CyDelay(20);
        // mode exit if user press switch     
                  if(LED_Read()==1){mode++;Buzzer_Write(0);}
        
        
     
    }
    
}


//////////////////////

void ind_mode(void)
{
    LCD_Position(0,0);
    LCD_PrintString("* INDUCTANCE  MODE *");
    
    LCD_Position(1,6);
        LCD_Position(1,6);
        LCD_PrintString("o-");LCD_PutChar(LCD_CUSTOM_7);LCD_PutChar(LCD_CUSTOM_7);
        LCD_PutChar(LCD_CUSTOM_7);LCD_PutChar(LCD_CUSTOM_7);LCD_PrintString("-o");
    LCD_Position(2,0); LCD_PrintString("  Program for      ");
    LCD_Position(3,0); LCD_PrintString("      SINE Wave  ");    
    CyDelay(100);
    while(mode==3)
    {
      int i=0;
        for(i=0;i<255;i=i+8)
        {
   IDAC_SetValue(sine_wave[i]); // feed from a lookuo table
         }     
     if(LED_Read()==1) {mode++;}// EXIT COND
  
        }
    
    
}

Code Ver 1.6

Provision for Inductance

#include <project.h>

volatile uint32_t us_10=0;  // 10 uSec variable
int current =0;
int voltage =0;
int resistance=0;
uint32_t IDAC_Val=0xff;
int c=4095;    
int j=0; //use as loop counter
int mode =1;

CY_ISR(Timing_ISR_Handler)
{
    us_10++;
    Timer_ClearInterrupt(Timer_TC_INTERRUPT_MASK);

}


uint8_t  sine_wave[256] = {
  0x80, 0x83, 0x86, 0x89, 0x8C, 0x90, 0x93, 0x96,
  0x99, 0x9C, 0x9F, 0xA2, 0xA5, 0xA8, 0xAB, 0xAE,
  0xB1, 0xB3, 0xB6, 0xB9, 0xBC, 0xBF, 0xC1, 0xC4,
  0xC7, 0xC9, 0xCC, 0xCE, 0xD1, 0xD3, 0xD5, 0xD8,
  0xDA, 0xDC, 0xDE, 0xE0, 0xE2, 0xE4, 0xE6, 0xE8,
  0xEA, 0xEB, 0xED, 0xEF, 0xF0, 0xF1, 0xF3, 0xF4,
  0xF5, 0xF6, 0xF8, 0xF9, 0xFA, 0xFA, 0xFB, 0xFC,
  0xFD, 0xFD, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
  0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFE, 0xFE, 0xFD,
  0xFD, 0xFC, 0xFB, 0xFA, 0xFA, 0xF9, 0xF8, 0xF6,
  0xF5, 0xF4, 0xF3, 0xF1, 0xF0, 0xEF, 0xED, 0xEB,
  0xEA, 0xE8, 0xE6, 0xE4, 0xE2, 0xE0, 0xDE, 0xDC,
  0xDA, 0xD8, 0xD5, 0xD3, 0xD1, 0xCE, 0xCC, 0xC9,
  0xC7, 0xC4, 0xC1, 0xBF, 0xBC, 0xB9, 0xB6, 0xB3,
  0xB1, 0xAE, 0xAB, 0xA8, 0xA5, 0xA2, 0x9F, 0x9C,
  0x99, 0x96, 0x93, 0x90, 0x8C, 0x89, 0x86, 0x83,
  0x80, 0x7D, 0x7A, 0x77, 0x74, 0x70, 0x6D, 0x6A,
  0x67, 0x64, 0x61, 0x5E, 0x5B, 0x58, 0x55, 0x52,
  0x4F, 0x4D, 0x4A, 0x47, 0x44, 0x41, 0x3F, 0x3C,
  0x39, 0x37, 0x34, 0x32, 0x2F, 0x2D, 0x2B, 0x28,
  0x26, 0x24, 0x22, 0x20, 0x1E, 0x1C, 0x1A, 0x18,
  0x16, 0x15, 0x13, 0x11, 0x10, 0x0F, 0x0D, 0x0C,
  0x0B, 0x0A, 0x08, 0x07, 0x06, 0x06, 0x05, 0x04,
  0x03, 0x03, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01,
  0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x03,
  0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x0A,
  0x0B, 0x0C, 0x0D, 0x0F, 0x10, 0x11, 0x13, 0x15,
  0x16, 0x18, 0x1A, 0x1C, 0x1E, 0x20, 0x22, 0x24,
  0x26, 0x28, 0x2B, 0x2D, 0x2F, 0x32, 0x34, 0x37,
  0x39, 0x3C, 0x3F, 0x41, 0x44, 0x47, 0x4A, 0x4D,
  0x4F, 0x52, 0x55, 0x58, 0x5B, 0x5E, 0x61, 0x64,
  0x67, 0x6A, 0x6D, 0x70, 0x74, 0x77, 0x7A, 0x7D
};


void measure_resistance(void);
void measure_continuity(void);
void measure_capacitance(void);
void measure_diode(void);
void measure_inductance(void);


void res_mode(void)
{
        
}
/////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////// MAIN LOOP /////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////
int main()
{   
    LCD_Start();
    ADC_Start();
    IDAC_Start();
    Timer_Start();
    Timing_ISR_StartEx(Timing_ISR_Handler);
//    CyGlobalIntEnable;
    mode=1;
    IDAC_SetValue(IDAC_Val);
    ADC_StartConvert();
    LCD_Position(1,0);LCD_PrintString(" ! PSoC Auto Range !");
    LCD_Position(2,0);LCD_PrintString("***   LRC Meter  ***");
    CyDelay(2000);
    LCD_ClearDisplay();

    
    for(;;)
    {
    measure_capacitance();
    measure_resistance();
    measure_continuity();
    measure_diode();
        if (mode>4) {mode=1;}
    
  
    } ///////////////////////// Forever for loop ends here /////////////////////////////////*/

} ///////////////////=========== main loop Ends Here ===============/////////////////////////





///////////////////////////// FUNCTIONS BODY /////////////////////////////
void measure_resistance()
{
     IDAC_Start();
    unsigned long R=0;
    while (mode==1)
    {
    Buzzer_Write(0);
    IDAC_Val=0xff;
    c=4095;
    
        while((IDAC_Val>0)&&(c>=4000))
        {
    
        IDAC_Val=IDAC_Val-0x01;
        IDAC_SetValue(IDAC_Val);
        CyDelay(3);
        while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
        c=ADC_GetResult16(0);
        CyDelay(2);
        }   
        
        if (c<4000)
        {
            
            IDAC_SetValue(IDAC_Val);      
            CyDelay(1);
            current= IDAC_Val*1.2;   // in uAmp
            voltage=c*1000/2;        // in uVolt
            resistance = voltage/current;  // Ohms Law to calculate resistanc
            resistance = resistance - 148; // offsetting internal trace resistance of 150 ohms per trace
                
                if (resistance<=0) {resistance = 0;}                  // omitting any negative value
                if (resistance>5000) {resistance = resistance*1.05;} // soft correction to reduce error
                
              LCD_ClearDisplay();
                // 500K IS THE LIMIT FOR RESISTANCE 
             if (resistance<500000)
             {
              //  Show Result on LCD  //     
              LCD_Position(0,0); LCD_PrintString("*  RESISTANCE MODE *");      
              LCD_Position(1,6);LCD_PrintString("o_");LCD_PutChar(LCD_CUSTOM_2);LCD_PutChar(LCD_CUSTOM_3);
              LCD_PutChar(LCD_CUSTOM_2);LCD_PutChar(LCD_CUSTOM_3);LCD_PrintString("_o");
              LCD_Position(2,5); LCD_PrintU32Number(resistance);
              LCD_PrintString(" ");LCD_PutChar(LCD_CUSTOM_0);
              LCD_Position(3,5);LCD_PrintU32Number(resistance/1000);
                    if(resistance%1000>=100)LCD_PrintString(".");
                    else if(resistance%1000>=10)LCD_PrintString(".0");
                    else if(resistance%1000<10)LCD_PrintString(".00");
              LCD_PrintU32Number(resistance%1000);
              LCD_PrintString(" k");
              LCD_PutChar(LCD_CUSTOM_0);
              CyDelay(100); 
             }
            
            else 
             {
              LCD_Position(0,0);LCD_PrintString("*  RESISTANCE MODE *");                      
              LCD_Position(1,6);LCD_PrintString("o_    _o");         
              LCD_Position(2,0); LCD_PrintString("No Resistor Detected");
              LCD_Position(3,0); LCD_PrintString(" Connect Resistor !!");
              CyDelay(100);
              }
            

        
        CyDelay(100);
        // mode exit if user press switch     
            if(LED_Read()==1){mode++;}
        }
        
     
    }
}


void measure_capacitance()
{
   
    while (mode==2)
    {
     // Timer_WritePeriod(10);
        IDAC_Stop();
          while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
          c=ADC_GetResult16(0);
   
        LCD_ClearDisplay();
        LCD_Position(0,0);
        LCD_PrintString("* CAPACITANCE MODE *");
        LCD_Position(1,2);
        LCD_PrintString("(+) o--  --o (-)");

        IDAC_Start();
        IDAC_Val=100;
        IDAC_SetValue(IDAC_Val);// times 1.2 uA times CHARGE TIME is Q Coulomb charge
   
        int k=0;
        uint16 ADC_Level = 2048 ; // caps will charge through IDAC current upto this level
            while(c<ADC_Level)
            {
                if(k==0) // One time loop 
                {
                LCD_Position(0,0);LCD_PrintString("* CAPACITANCE MODE *");
                LCD_Position(1,2);LCD_PrintString("(+) o--");LCD_PutChar(LCD_CUSTOM_6);
                LCD_PutChar(LCD_CUSTOM_5);LCD_PrintString("--o (-)");

                LCD_Position(2,0);LCD_PrintString("   Measuring.....");
                k++;CyGlobalIntDisable; us_10=0;CyGlobalIntEnable;
                }
                // ADC is measuring voltage across capacitor
                while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}  
                c=ADC_GetResult16(0);
    
            }
    
        CyGlobalIntDisable;  // disabling interrupt to stop updating time
        IDAC_SetValue(0x00); // IDAC current is set 0
        IDAC_Stop();         // IDAC is stopped
        LCD_ClearDisplay();
        
        // Using C = Q/V = I*t/V formula, Capacitance will be calculated and displayed 
                while(c>256)
                {     
                LCD_Position(0,0); LCD_PrintString("* CAPACITANCE MODE *");        
        // Calculation Below //
                
                //  float Charge = IDAC_Val*1.2; // 1.2 uA is the step current               
                //  uint32 Time = us_10/100;  // microsec to milisec
                //  float Volt = ADC_Level/2.0;
                //  Approx Timing Correction for Execution Delay by adding 20% to calculated value (1.2 times)
                
                double nFCaptemp =  1000*1.2*((IDAC_Val*1.2*us_10/100.0)/(ADC_Level/2.0));
                uint32 nFCap = nFCaptemp;
                uint32 Capacitance = nFCap/1000;
              
        
        // Displaying Capacitacne on LCD //
                LCD_Position(1,2);LCD_PrintString("(+) o--  --o (-)");
              //  LCD_PrintString("(+) o--");LCD_PutChar(LCD_CUSTOM_6);LCD_PutChar(LCD_CUSTOM_5);LCD_PrintString("--o (-)");  
                LCD_Position(2,7); LCD_PrintU32Number(Capacitance);LCD_PrintString(" uF ");
                LCD_Position(3,7);; LCD_PrintU32Number(nFCap);LCD_PrintString(" nF ");
    
                CyDelay(500);
                
                // Checks for presence of Capacitance connected to Probe //
                while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                c=ADC_GetResult16(0);

                }
        LCD_ClearDisplay();
        // mode exit if user press switch
        if(LED_Read()==1){mode++;}
        
        
    } 

}



void measure_continuity()
{
    IDAC_Start();
    LCD_ClearDisplay(); 
              //  Show Result on LCD  //     
    LCD_Position(0,0);LCD_PrintString("*  CONTINUITY MODE *");                      
    LCD_Position(1,6);LCD_PrintString("o-    -o");         
    LCD_Position(2,0); LCD_PrintString("   Continuity....  ");
    LCD_Position(3,0); LCD_PrintString("   Not Detected !!  ");
              
    Buzzer_Write(0);
    IDAC_Val=100;
    IDAC_SetValue(IDAC_Val);
    c=100;
    CyDelay(1000);
     while (mode==3)
    {
        
                if (c<50)
              { 
                  while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                  c=ADC_GetResult16(0);
                  CyDelay(10);
              LCD_ClearDisplay();
              //  Show Result on LCD  //     
              LCD_Position(0,0); LCD_PrintString("*  CONTINUITY MODE *");      
              LCD_Position(1,6);LCD_PrintString("o------o");
              LCD_Position(2,0); LCD_PrintString("   Continuity....  ");
              LCD_Position(3,0); LCD_PrintString("      Detected !!  ");
              Buzzer_Write(1);
              CyDelay(20); 
             }
            
              if (c>50)  
              {
                    while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                    c=ADC_GetResult16(0);
                    CyDelay(10);
              LCD_ClearDisplay(); 
              //  Show Result on LCD  //     
              LCD_Position(0,0);LCD_PrintString("*  CONTINUITY MODE *");                      
              LCD_Position(1,6);LCD_PrintString("o-    -o");         
              LCD_Position(2,0); LCD_PrintString("   Continuity....  ");
              LCD_Position(3,0); LCD_PrintString("   Not Detected !!  ");
              Buzzer_Write(0);
              CyDelay(20);
              }
            

        
        CyDelay(20);
        // mode exit if user press switch     
                  if(LED_Read()==1){mode++;Buzzer_Write(0);}
        
        
     
    }
    
}

//////// diode ///////////////
void measure_diode()
{
    IDAC_Start();
    LCD_ClearDisplay(); 
              //  Show Result on LCD  //     
    LCD_Position(0,0);LCD_PrintString("*    DIODE MODE    *");                      
    LCD_Position(1,6);LCD_PrintString("o--  --o");         
    LCD_Position(2,0); LCD_PrintString("   Diode/LED  ....  ");
    LCD_Position(3,0); LCD_PrintString("   Not Detected !!  ");
              
    Buzzer_Write(0);
    IDAC_Val=255;
    IDAC_SetValue(IDAC_Val);
    c=100;
    CyDelay(1000);
     while (mode==4)
    {
        
                if (c>3850)
              { 
                  while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                  c=ADC_GetResult16(0);
                  CyDelay(10);
              LCD_ClearDisplay();
              //  Show Result on LCD  //     
                LCD_Position(0,0);LCD_PrintString("*    DIODE MODE    *");                      
                LCD_Position(1,6);LCD_PrintString("o--  --o");         
                LCD_Position(2,0); LCD_PrintString("   Diode/LED  ....  ");
                LCD_Position(3,0); LCD_PrintString("   Not Detected !!  ");
              Buzzer_Write(0);
              CyDelay(200); 
             }
            
              if (c<3850)  
              {
                    while( ADC_IsEndConversion(ADC_RETURN_STATUS)){}
                    c=ADC_GetResult16(0);
                    CyDelay(10);
              LCD_ClearDisplay(); 
              //  Show Result on LCD  //     
               LCD_Position(0,0);LCD_PrintString("*    DIODE MODE    *");                      
               LCD_Position(1,6);LCD_PrintString("o--");
               LCD_PutChar(LCD_CUSTOM_6);LCD_PutChar(LCD_CUSTOM_4);LCD_PrintString("--o");         
               LCD_Position(2,0); LCD_PrintString("Diode/LED Detected !");
               LCD_Position(3,1); LCD_PrintString("V_fd = ");
               int vfd = c/2; // in mV
               LCD_PrintU32Number(vfd/1000);
                    if(vfd%1000>=100)LCD_PrintString(".");
                    else if(vfd%1000>=10)LCD_PrintString(".0");
                    else if(vfd%1000<10)LCD_PrintString(".00");
              LCD_PrintU32Number(vfd%1000);
              LCD_PrintString(" Volt");
               
            Buzzer_Write(1);
            CyDelay(10);
            Buzzer_Write(0);
              CyDelay(200);
              }
            

        
        CyDelay(20);
        // mode exit if user press switch     
                  if(LED_Read()==1){mode++;Buzzer_Write(0);}
        
        
     
    }
    
}


//////////////////////

void ind_mode(void)
{
    LCD_Position(0,0);
    LCD_PrintString("* INDUCTANCE  MODE *");
    
    LCD_Position(1,6);
        LCD_Position(1,6);
        LCD_PrintString("o-");LCD_PutChar(LCD_CUSTOM_7);LCD_PutChar(LCD_CUSTOM_7);
        LCD_PutChar(LCD_CUSTOM_7);LCD_PutChar(LCD_CUSTOM_7);LCD_PrintString("-o");
    LCD_Position(2,0); LCD_PrintString("  Program for      ");
    LCD_Position(3,0); LCD_PrintString("      SINE Wave  ");    
    CyDelay(100);
    while(mode==3)
    {
      int i=0;
        for(i=0;i<255;i=i+8)
        {
   IDAC_SetValue(sine_wave[i]); // feed from a lookuo table
         }     
     if(LED_Read()==1) {mode++;}// EXIT COND
  
        }
    
    
}

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PSoC 4: The Auto Ranging Multi-Meter

About the project

Project info

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Software apps and online services

Hand tools and fabrication machines

Story

Meters are Meters!

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Magical Firmware

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Code

PSoC Creator Files

main.c

Code Ver 1.5

Code Ver 1.6

Credits

electrouser805

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Shop

Project Hub

Video

Blog

Shop home

3D printing

Single Board Computers

Development kits

Sensors

Internet of things

Robotics

Accessories

Product of the Week

Electromaker Educator

The Electromaker Show

The Electromaker Podcast

PSoC 4: The Auto Ranging Multi-Meter

About the project

Project info

Items used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Meters are Meters!

Features

Simple Hardware & Working Principles

What is IDAC?

Magical Firmware

More Videos

Schematics, diagrams and documents

Device Pin Map

Code

PSoC Creator Files

main.c

Code Ver 1.5

Code Ver 1.6

Credits

electrouser805

Leave your feedback...

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