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Smart Christmas Star

Made by ashokr / Art / Communication / Games & Gaming / Holidays / Lights

About the project

Choose your own color & Control the Christmas star via Phone.

Project info

Difficulty: Easy

Platforms: Android, NXP, Android Things

Estimated time: 4 hours

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

Items used in this project

Hardware components

	LED - SMD RGB	x 1
	NXP 32-bit MCU, Power Arch core, 512KB Flash, 64MHz, -40/+105degC, Automotive Grade, QFP 64	x 1
	NXP 32-bit MCU, Power Arch core, 512KB Flash, 64MHz, -40/+105degC, Automotive Grade, QFP 64	x 1
	Ultrasonic Sensor Hc-sr04	x 1

Software apps and online services

	RGB Star Android App https://play.google.com/store/apps/details?id=com.ashok.rgbstar&hl=en_US
	LPCXpressoIDE

Hand tools and fabrication machines

Soldering Station

x 1

Story

Hello Guys!

Every year when Christmas arrives, i used to make my own version of 5 point star.I have a video tutorial on "Making of X-Mas Star" here have a look and try it yourself. I 'm little bored of doing the same thing every year, for change this time i made the "RGB Christmas Star".

The Idea is controlling RGB led from smart phone via Bluetooth. I had chooses small ARM controller (LPC810) from NXP because of less pins also its available in DIP package.To drive the LED 3 PWM signals from LPC810. BT module HC-05 is commonly available in market, it establish the communication between my smart phone and the MCU.

Hardware side nothing much,RGB LED is directly soldered to LPC810, and the other end 3.3v regulator i made to power the LPC810 and LED's.

And finally this setup is sit inside the Christmas Star with 5v USB power cable.

For mobile , i had created an android application for picking up the color and send the RGB values to MCU over blue-tooth. The MCU process the value and generate the PWM values according to the color selection.

Checkout the Working Video here! Happy Christmas!

caption (optional)

Schematics, diagrams and documents

RGB Star Schematic

Regulator IC may be different one

Code

RGB Star Source

#include "lpc8xx_clkconfig.h"
#include "lpc8xx_gpio.h"
#include "lpc8xx_uart.h"

#define RLED_ON()   (LPC_GPIO_PORT->SET0 = 1 << 1)
#define RLED_OFF() 	(LPC_GPIO_PORT->CLR0 = 1 << 1)
#define GLED_ON() 	(LPC_GPIO_PORT->SET0 = 1 << 2)
#define GLED_OFF() 	(LPC_GPIO_PORT->CLR0 = 1 << 2)
#define BLED_ON() 	(LPC_GPIO_PORT->SET0 = 1 << 3)
#define BLED_OFF() 	(LPC_GPIO_PORT->CLR0 = 1 << 3)
#define LPC_UART LPC_UART0

#define TRUE				1
#define true				1
#define FALSE				0
#define false				0

#define ONT_MIN				0
#define ONT_MAX				255
#define PT_MAX				255

#define UART_BAUD_9600	9600

#define SYSTICK_DELAYms		(SystemCoreClock/1000)  	/* Generate 1ms Ticks */
#define SYSTICK_DELAYus		(SystemCoreClock/100000)  	/* Generate .01ms (10us) Ticks */


// Variable to store CRP value in. Will be placed automatically
// by the linker when "Enable Code Read Protect" selected.
// See crp.h header for more information

volatile uint32_t msTicks=0;
volatile uint8_t RxData[4];
volatile uint8_t RxReady=0;
volatile uint8_t led_EN=0;

extern volatile uint8_t  UARTRxBuffer[BUFSIZE];
extern volatile uint32_t UARTRxCount;
struct Channel{

	volatile uint16_t ONTime;
	volatile uint32_t msPTicks;
	volatile uint8_t Set_Value;
	volatile uint8_t Enabled;
}r,g,b,ch4,ch5;



/* SysTick interrupt happens every 10 ms */
void SysTick_Handler(void)
{
msTicks++;
}

void Data_Init(){


	r.Enabled = false;
	g.Enabled = false;
	b.Enabled = false;


	r.ONTime = 255;
	g.ONTime = 255;
	b.ONTime = 255;


}
/* Main Program */

int main (void) {

uint16_t regVal;

  SystemCoreClockUpdate();

  //SwitchMatrix_Init();

  GPIOInit();

  /* Called for system library in core_cmx.h(x=0 or 3). */
  SysTick_Config( SYSTICK_DELAYus );



  LPC_SWM->PINENABLE0 = 0xffffffbfUL;

  /* Pin Assign 8 bit Configuration */
   /* U0_TXD */
   /* U0_RXD */
   LPC_SWM->PINASSIGN0 = 0xffff0004UL;



  LPC_GPIO_PORT->DIR0 |= (1 << 1);
  LPC_GPIO_PORT->DIR0 |= (1 << 2);
  LPC_GPIO_PORT->DIR0 |= (1 << 3);




	//init_mrt(0x8000);
  Data_Init();

  UARTInit(LPC_USART0,UART_BAUD_9600);

  RLED_ON();
  	  					GLED_ON();
  	  					BLED_ON();

  	  				

	
  while (1)                                /* Loop forever */
  {
    	  if(msTicks >= 255){

	  					msTicks = 0;
	  					RLED_ON();
	  					GLED_ON();
	  					BLED_ON();

	  					r.Enabled = true;
	  					g.Enabled = true;
	  					b.Enabled = true;


	  				 	 }
	  				else if((msTicks >= r.ONTime) && r.Enabled){

	  					RLED_OFF();
	  					r.Enabled = false;

	  					}
	  				else if((msTicks >= g.ONTime) && g.Enabled){

	  					GLED_OFF();
	  					g.Enabled = false;

	  					}
	  				else if((msTicks >= b.ONTime ) && b.Enabled){

	  					BLED_OFF();
	  					b.Enabled = false;

	  					}

	  					if(RxReady == true){


	  				    	RxData[0]=UARTRxBuffer[0];
	  				    	RxData[1]=UARTRxBuffer[1];
	  				    	RxData[2]=UARTRxBuffer[2];
	  				    	RxData[3]=UARTRxBuffer[3];

	  				    	if((RxData[0] <=255) && (RxData[1] <= 255) && (RxData[2] <= 255) && (RxData[0] <= 255) ){

	  				    		r.ONTime = RxData[1];
	  				    		g.ONTime = RxData[2];
	  				    		b.ONTime = RxData[3];
	  				    		led_EN = RxData[0];
	  				    	}


	  				    	RxReady= false;


	  				}
  }
}

Credits

ashokr

Hello! I’m Ashok. I’m currently working as software engineer. passionate about doing Hobbies Projects and Animations works.

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