How to use linear encoders with Arduino. hardware, code, and demo.

How to salvage linear encoders form a broken (or out of ink) printer and use them with an Arduino to make precise motions measurements. Hardware, theory, software walkthrough, and demo.

I also discuss some of the pitfalls of interrupt code.

The code:

// Interrupt information
// 0 on pin 2
// 1 on pin 3

#define encoderI 2
#define encoderQ 4 // Only use one interrupt in this example

volatile int count;
void setup()
{
Serial.begin(115200);
count=0;
pinMode(encoderI, INPUT);
pinMode(encoderQ, INPUT);

attachInterrupt(0, handleEncoder, CHANGE);

}

void loop()
{
Serial.println(count);
delay(10);
}

void handleEncoder()
{
if(digitalRead(encoderI) == digitalRead(encoderQ))
{
count++;
}
else
{
count--;
}

}

Видео How to use linear encoders with Arduino. hardware, code, and demo. канала Cheap Science