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Roll It Measure It

Made by Eswar / 3D Printing / Productivity / Sensors / Wearables

About the project

An invention doesn’t have to complicated but it has to be useful for the humankind.

Project info

Difficulty: Moderate

Platforms: Arduino, Atmel

Estimated time: 1 week

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

Items used in this project

Hardware components

	Rotary Encoder	x 1
	ARDUINO NANO V3	x 1
	ATMEGA328PB IND TEMP QFN/MLF	x 1
	resistors	x 1
	capacitors	x 1
	Lithium Ion Polymer Battery - 3.7V 500mAh	x 1
	Monochrome 0.96" OLED Graphic Display	x 1
	tp4056 lithium ion battery charger ic	x 1
	AMS117 Low dropout regulator	x 1

View all

Software apps and online services

	Arduino ide for program the arduino
	proteus simulation purpose
	eagle schematic and PCB designing
	FUSION360 for 3d modelling and rendering

Hand tools and fabrication machines

	soldering iron	x 1
	multimeter	x 1

Story

Simulation video link:QINK

I made this circuit only for simulation purpose. So, I didn’t include battery charging circuits and battery here. since I couldn't able to find the rotary encoder in proteus I used a motor encoder for simulation purpose. Here I connected the output A and B of the encoder to GPIO pins of atmega328. And I followed usual connection and program for OLED. and here I represented the rotary encoder using a separate button. And by pressing that you can see variation information like battery percentage, measured distance in different units (mm, cm, M).and by tweaking the program a bit you can assign any functionality to that button. Like one click to measure and double click to battery percentage and so on. Since it just a prototype I didn’t use any filter circuit in rotary encoder.

Code:

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
 
int pin1 = 2;
int pin2 = 3;
int pin3 = 5;
int AnalogPin=A5;
 
int Nticks = 0; 
int State;
int LastState; 
int counter=0; 
int counter_state;
int prestate=0;
 
const float pi = 3.14;
const float R = 3.45;
float batAnalog=0;
int   bat=0;
const int N = 40;
 
float distance = 0;
float distance1=0;
float distance2=0;
String thisString;
 
#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 
#define OLED_MOSI   9
#define OLED_CLK   10
#define OLED_DC    11
#define OLED_CS    12
#define OLED_RESET 13
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,
  OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);
  
 
  
void setup() {
  Serial.begin(9600);
 pinMode (pin1 ,INPUT_PULLUP);
  pinMode (pin2 ,INPUT_PULLUP);
  pinMode(pin3,INPUT);
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
  
  }
  delay(2000);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
 
   
 
  
}
 
void loop() {
 
     counter_state=digitalRead(pin3);
   
     
     if(counter_state==HIGH && prestate==0)
     {
      if(counter<=3)
      {
        counter++;
        prestate=1;
      }
     }
     else if(counter_state==LOW)
     {
      prestate=0;
     }
     
     if(counter>3)
     {
      counter=0;
     }
     Serial.print("count");
     Serial.println(counter);
     
    State = digitalRead(pin1);
   if (State != LastState){     
     if (digitalRead(pin2) != State) { 
       Nticks ++;
     } 
     
     else {
       Nticks --;
     }
   } 
 
  distance = ((2*pi*R)/N) * Nticks ;
  distance=distance*-1;
  thisString = String(distance);
   
  
  LastState = State;
 
  if (counter==0)
  {
  display.setCursor(10,10);
  display.print(distance);
  display.print(" Cm");
  display.display();
  Serial.println(distance);
  display.clearDisplay();
  }
  if (counter==1)
  {
  distance1=(distance/100);
  display.setCursor(10,10);
  display.print(distance1);
  display.print(" M");
  display.display();
  Serial.println(distance);
  display.clearDisplay();
    
  }
  if (counter==2)
  {
  distance2=(distance*10);
  display.setCursor(10,10);
  display.print(distance2);
  display.print(" mm");
  display.display();
  Serial.println(distance);
  display.clearDisplay();
  }
 if(counter==3)
  {
    batAnalog=analogRead(A5);
    {
      batAnalog=(batAnalog*5.0)/1024.0;
      delay(500);
      bat=((batAnalog/5.0)*100);
      display.setCursor(10,10);
      display.print("Battery aval ");
      display.print(bat);
      display.print("%");
      display.display();
      Serial.println(bat);
      display.clearDisplay();
      
    }
  }
}

I have made a schematic in eagle that you can refer and I have also made a 3d enclosure for this project.so it will look more cool and easily portable. You can find those files in my GitHub repository. Since I have small amount of time available in midst of my college works, I have added some of the fundamental features only guys. But in future I am planning to add some features to it by integrating some sensors, own designed small encoder to make it compact and a better display panel.so guys stay tuned for updates.

Guys you may think this not a complicated invention but it is a useful one.as I mentioned earlier

An invention doesn’t have to complicated but it has to be useful for the humankind.

And I believe this project satisfies this wise quote.

Ok guys that’s it. I guess It's time for you to hit your workstation and make something useful that will make the world a better place.

Schematics, diagrams and documents

PCB

CAD, enclosures and custom parts

3d modeled enclosure

Go to download

Code

roll it

Roll IT code

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

int pin1 = 2;
int pin2 = 3;
int pin3 = 5;
int AnalogPin=A5;

int Nticks = 0; 
int State;
int LastState; 
int counter=0; 
int counter_state;
int prestate=0;

const float pi = 3.14;
const float R = 3.45;
float batAnalog=0;
int   bat=0;
const int N = 40;

float distance = 0;
float distance1=0;
float distance2=0;
String thisString;

#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 
#define OLED_MOSI   9
#define OLED_CLK   10
#define OLED_DC    11
#define OLED_CS    12
#define OLED_RESET 13
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,
  OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);
  

  
void setup() {
  Serial.begin(9600);
 pinMode (pin1 ,INPUT_PULLUP);
  pinMode (pin2 ,INPUT_PULLUP);
  pinMode(pin3,INPUT);
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
  
  }
  delay(2000);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
 
   

  
}

void loop() {

     counter_state=digitalRead(pin3);
   
     
     if(counter_state==HIGH && prestate==0)
     {
      if(counter<=3)
      {
        counter++;
        prestate=1;
      }
     }
     else if(counter_state==LOW)
     {
      prestate=0;
     }
     
     if(counter>3)
     {
      counter=0;
     }
     Serial.print("count");
     Serial.println(counter);
     
    State = digitalRead(pin1);
   if (State != LastState){     
     if (digitalRead(pin2) != State) { 
       Nticks ++;
     } 
     
     else {
       Nticks --;
     }
   } 

  distance = ((2*pi*R)/N) * Nticks ;
  distance=distance*-1;
  thisString = String(distance);
   
  
  LastState = State;

  if (counter==0)
  {
  display.setCursor(10,10);
  display.print(distance);
  display.print(" Cm");
  display.display();
  Serial.println(distance);
  display.clearDisplay();
  }
  if (counter==1)
  {
  distance1=(distance/100);
  display.setCursor(10,10);
  display.print(distance1);
  display.print(" M");
  display.display();
  Serial.println(distance);
  display.clearDisplay();
    
  }
  if (counter==2)
  {
  distance2=(distance*10);
  display.setCursor(10,10);
  display.print(distance2);
  display.print(" mm");
  display.display();
  Serial.println(distance);
  display.clearDisplay();
  }
 if(counter==3)
  {
    batAnalog=analogRead(A5);
    {
      batAnalog=(batAnalog*5.0)/1024.0;
      delay(500);
      bat=((batAnalog/5.0)*100);
      display.setCursor(10,10);
      display.print("Battery aval ");
      display.print(bat);
      display.print("%");
      display.display();
      Serial.println(bat);
      display.clearDisplay();
      
    }
  }
}

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Roll It Measure It

About the project

Project info