Electrical – Generate rotary encoder signal

arduinoencoder

I need to generate signals at the output of a Mega Arduino to simulate the signals of a rotary encoder. I know how to generate frequency signals through the function below. How could I generate the signals as in the image below, with a time lag between them? I have to take into account that the frequency must be the same.

void Encoder() {
    tone(51,60);//Generates a 60Hz signal at output 51
    tone(52,60);//Generates a 60Hz signal at output 52
}

enter image description here

update:

I was able to generate the desired signal by doing the following:

void Encoder() {

        int i;

        for (i == 0; i <= 10000; i++) {
            digitalWrite(50, HIGH);
            delay(10);
            digitalWrite(48, HIGH);
            delay(10);
            digitalWrite(50, LOW);
            delay(10);
            digitalWrite(48, LOW);
            delay(10);
            digitalWrite(50, HIGH);
            delay(10);
            digitalWrite(48, HIGH);
            delay(10);
            digitalWrite(50, LOW);
            delay(10);
            digitalWrite(48, LOW);
            delay(10);
        }
    }

Best Answer

If you don't care too much about the exact frequency and timing you can use the below method- delays are 1/4 of 1/60 second or 4167us ideally, but the writes and the loop use some time so the frequency will be a bit lower than 60Hz.

If you need very accurate timing or you need the micro to be available for other tasks you can access the on-chip timers directly, but that's a bit more effort. 

// play with the below number a bit to change the timing
#define DLY 4167

void setup() {
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
digitalWrite(13, LOW);
digitalWrite(12, LOW);
}

void loop() {
  delayMicroseconds(DLY); 
  digitalWrite(12, HIGH);
  delayMicroseconds(DLY); 
  digitalWrite(13, HIGH);
  delayMicroseconds(DLY); 
  digitalWrite(12, LOW);
  delayMicroseconds(DLY); 
  digitalWrite(13, LOW);
  }

(ignore the voltage display, they are both 0/5V)

enter image description here

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