Increment Rotary encoder working on MEGA but not on NANO

Hi all,

pls move this topic if it is in the wrong section.

I have a simple Encoder counter for increase and decrease for every 100th step it sets an output nothing fancy.

The program works fine without a problem on a Arduino Mega 256 but due to its overkill on this project i have decided to move it to a nano.

But now the issue starts iam not getting any readings on the nano.

I have added a serial start up print to see if the nano is processing.

se blow my code for the MEGA does anyone have a suggestion why this is not working on the nano?

volatile unsigned int temp, counter = 0; // This variable will increase or decrease depending on the rotation of the encoder

void setup() {
    Serial.begin(9600);
  Serial.println("Setup complete. Starting program...");

  pinMode(2, INPUT_PULLUP); // internal pullup input pin 2 (interrupt 0 on Arduino Nano)
  pinMode(3, INPUT_PULLUP); // internal pullup input pin 3 (interrupt 1 on Arduino Nano)
  pinMode(7, OUTPUT);       // D7 as output
  pinMode(8, OUTPUT);       // D8 as output
  pinMode(9, INPUT_PULLUP); // D9 as input with internal pullup

  // Setting up interrupt
  // A rising pulse from encoder activates ai0(). AttachInterrupt 0 is DigitalPin nr 2 on Arduino Nano.
  attachInterrupt(digitalPinToInterrupt(2), ai0, RISING);

  // B rising pulse from encoder activates ai1(). AttachInterrupt 1 is DigitalPin nr 3 on Arduino Nano.
  attachInterrupt(digitalPinToInterrupt(3), ai1, RISING);
}

void loop() {
  // Send the value of counter
  if (counter != temp) {
    Serial.println(counter);
    temp = counter;
  }

  // If D9 is read as HIGH, reset counter to 0
  if (digitalRead(9) == LOW) {
    counter = 0;
  }

  // If counter exceeds 14000, reset counter to 0
  if (counter > 14000) {
    counter = 0;
  }
}

void ai0() {
  // ai0 is activated if DigitalPin nr 2 is going from LOW to HIGH
  // Check pin 3 to determine the direction
  if (digitalRead(3) == LOW) {
    counter++;
    // For every 100th rising count of counter, set D7 high
    if (counter % 100 == 0) {
      digitalWrite(7, HIGH);
      Serial.print("D7 HIGH on increment: ");
      Serial.println(counter);
      delay(10);  // Brief delay to ensure the signal is detectable
      digitalWrite(7, LOW);
    }
  } else {
    counter--;
    // For every 100th falling count of counter, set D8 high
    if (counter % 100 == 0) {
      digitalWrite(8, HIGH);
      Serial.print("D8 HIGH on decrement: ");
      Serial.println(counter);
      delay(10);  // Brief delay to ensure the signal is detectable
      digitalWrite(8, LOW);
    }
  }
}

void ai1() {
  // ai1 is activated if DigitalPin nr 3 is going from LOW to HIGH
  // Check pin 2 to determine the direction
  if (digitalRead(2) == LOW) {
    counter--;
    // For every 100th falling count of counter, set D8 high
    if (counter % 100 == 0) {
      digitalWrite(8, HIGH);
      Serial.print("D8 HIGH on decrement: ");
      Serial.println(counter);
      delay(10);  // Brief delay to ensure the signal is detectable
      digitalWrite(8, LOW);
    }
  } else {
    counter++;
    // For every 100th rising count of counter, set D7 high
    if (counter % 100 == 0) {
      digitalWrite(7, HIGH);
      Serial.print("D7 HIGH on increment: ");
      Serial.println(counter);
      delay(10);  // Brief delay to ensure the signal is detectable
      digitalWrite(7, LOW);
    }
  }
}

The rotary encoder is working on 5-24V and has A & B outputs for clockwise and counterclock

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