Encoder have a maximum value?

Projects Programming
1

Hi, I'm having problems reading an optic encoder, it counts pulses just fine but when it gets to a certain value it resets from another pulse count, this is the code I'm using.

#define ENCA 2 // YELLOW
#define ENCB 3 // WHITE
volatile int posi = 0;

void setup() {
  Serial.begin(9600);
  pinMode(ENCA,INPUT);
  pinMode(ENCB,INPUT);
  attachInterrupt(digitalPinToInterrupt(ENCA),readEncoder,RISING);
}

void loop() {
  Serial.println(posi);
  
  }

void readEncoder(){
  int b = digitalRead(ENCB);
  if(b > 0){
    posi++;
  }
  else{
    posi--;
  }
}

I attached the encoder to a dc motor to try it, it has 430 pulses per revolution
and the serial plotter output is the following

imagen_2022-05-24_200033743
imagen_2022-05-24_2000337431920×928 23.3 KB

it gets to 32743 and then it goes to the negative value, the motor its spinning only in one direction.

2

At what point does posi overflow ?
Check your data types.

3

Arduino data types and the ranges of values that they can hold.

4

Ooh thanks, i think thats it, i went to the page and for int it goes to the value i had, thanks for the help, gonna try it again with another data type