change encoder pulses to degrees

Projects Programming
1

hello all,

i have my projects but i'm very new with arduino and the programming. I make encoder disc with 120 holes and two optocoupler as the sensors to count pulses. I got this code but this code just count the pulses not degrees.

#include <LiquidCrystal.h>

char lineText[]="  Hello World!  ";
int sensor01;
int sensor02;

int stepOld;
int step;

long PulseCount;

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(6, 7, 8, 9, 10, 11);

#define SENSOR_A 3
#define SENSOR_B 2


void checkState(){
  sensor01 = digitalRead(SENSOR_A);
  sensor02 = digitalRead(SENSOR_B);

  if(sensor01 == 1 && sensor02 == 1){
    step = 0;
    if(stepOld == 1){
      PulseCount--;
    }
    if(stepOld == 3){
      PulseCount++;
    }
    stepOld = 0;
  }

  if(sensor01 == 0 && sensor02 == 1){
    step = 1;
    if(stepOld == 2){
      PulseCount--;
    }
    if(stepOld == 0){
      PulseCount++;
    }
    stepOld = 1;
  }

  if(sensor01 == 0 && sensor02 == 0){
    step = 2;
    if(stepOld == 3){
      PulseCount--;
    }
    if(stepOld == 1){
      PulseCount++;
    }
    stepOld = 2;
  }

  if(sensor01 == 1 && sensor02 == 0){
    step = 3;
    if(stepOld == 0){
      PulseCount--;
    }
    if(stepOld == 2){
      PulseCount++;
    }
    stepOld = 3;
  }

}

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.setCursor(0, 0);
  lcd.print("                ");
  lcd.setCursor(0, 1);
  lcd.print("                ");

  attachInterrupt(0, checkState, CHANGE);
  attachInterrupt(1, checkState, CHANGE);



  PulseCount = 0;
}

void loop() {

  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 0);

  lcd.print("Pulses:");
  if(PulseCount > -1){
    lcd.print(" ");
  }

  if(PulseCount < 10 && PulseCount > -10){
    lcd.print(" ");
  }

  if(PulseCount < 100 && PulseCount > -100){
    lcd.print(" ");
  }

  lcd.print(PulseCount);
  if(sensor01 == 1){
    lcd.print(" HIGH");
  }
  else{
    lcd.print(" LOW ");
  }




  lcd.setCursor(0, 1);

  if(sensor02 == 1){
    lcd.print("            HIGH");
  }
  else{
    lcd.print("            LOW ");
  }

}

i have some questions :

  1. how to convert the pulses to degrees on the codes ?

  2. I want to stop the counter when it has max value and the encoder back to start position (0 degree). So the display keep show the max value. How to make it possible ?

2

This this is the code I used to have the degrees wrap around. it's simple

      if (YawInput > 180) YawInput -= 360; // rollover to negative
      if (YawInput < -180) YawInput += 360; // rollover to positive

as for converting the pulses to degrees just add them to the variable and reset it to zero.

YawInput  += PulseCount
PulseCount = 0;

z

3
  1. how to convert the pulses to degrees on the codes ?

One pulse == n degrees. When you know what n is, then simple multiplication is all that is required.