Missing counting encoder

Forum 2005-2010 (read only) Hardware Interfacing
1

I have

  • DC motor with encoder 8000 pulse/round ( minertia series F B5L)
  • arduino ATmega328

I already use interupt but it still missing counting

int encoder0PinA = 2;
int encoder0PinB = 3;
volatile int encoder0Pos = 0;
volatile int encoder0PinALast = LOW;
volatile int n = LOW;
int valNew = 0;
int valOld = 0;
volatile int m = LOW;

void setup()
{
pinMode (encoder0PinA,INPUT);
pinMode (encoder0PinB,INPUT);
Serial.begin (9600);
attachInterrupt(1, CountA, CHANGE);
attachInterrupt(0, StateB, FALLING);
}

void loop()
{
encoder0PinALast = n;
valNew = encoder0Pos;
if (valNew != valOld) {
Serial.println (encoder0Pos, DEC);
valOld = valNew;
}

}

void CountA()
{
n = digitalRead(encoder0PinA);
if ((encoder0PinALast == LOW) && (n == HIGH)) {
if (m == LOW) {
encoder0Pos--;
}
else {
encoder0Pos++;
}
}
}
void StateB()
{
m = digitalRead(encoder0PinB);
}

2

This motor is 130 rpm (sorry not good in english ^^)

If it too fast for this code or arduino, how can I use this encoder?

Have any code for change this encoder too lower pulse?

3

Hi YeahYoo,

We need to know the answers to Richard's questions, ie rotational speed and position or just RPM needed.

However, bear in mind that interrupts are actually slower than properly-written polled code, so if the speeds are high you may need to adjust your code.

Rob

4

I try to do shaft position encoding.

PS : my project is balancing bicycle robot by stearing control
(This motor use to control stearing)