Attach interrupt not working on arduino Uno

Projects Programming
1

hello, hope you doing all well, i was trying to trigger an interruption from a nano rp 2040 connect on arduino nano, i linked them with one wire, set the pin for interruption, and this is the code i used :

volatile bool pinState = LOW;
void setup() {
  Serial.begin(9600);
   // Set up the interrupt pin as input
  pinMode(10, INPUT);

  // Attach interrupt to the interrupt pin, triggering on any change (RISING or FALLING)
  attachInterrupt(digitalPinToInterrupt(10), handleInterrupt, CHANGE);
}

void loop() {
  // put your main code here, to run repeatedly:
    delay(100);
}

void handleInterrupt() {
  // This function is called when the interrupt pin changes state
  pinState = digitalRead(10); // Read the current state of the pin

  if (pinState == HIGH) {
    Serial.println("Interrupt detected: Pin is HIGH");
  } else {
    Serial.println("Interrupt detected: Pin is LOW");
  }
}

i did use a level shifter ( since rp2040 operates on 3.3 V and uno on 5 v logic) , i tested with an oscilloscope and checked that the wire sending interruption signal to arduino uno had indeed 5 V, so i can t figure out why the interruption isn't happening.

2

The topic title

Attach interrupt not working on arduino Uno

Please clarify which board the sketch that you posted is running on

3

You attached the interrupt to pin 10 but your handler is reading pin 11.

4

sorry, that was the code on arduino uno ( once the rp 2040 connect set the pin to high, it should trigger the interruption) , i added a print of the digital state of the pin in uno and it s effectively changing, so the problem is why the interruption not triggered.

5

no , it s was mistake by me while writing the code here, sorry.

6

you need 2 wires : GNDs need to be shared

make also sure that they run at the same voltage.

7

The Uno does not support external interrupts on pin 10, only pins 2 and 3

2 Likes
9

ah thanks, didn t knew that, thought i could customize using attach interrupt.

10

anyway to do an interruption on arduino uno on a custom pin like D4 or D10 ?

11

You can use pin change interrupts, but they have several limitations.

You should never print or do any serial I/O in an interrupt routine. On most MCUs, that will crash or freeze the program.

Arduino put in a work-around that allows serial print to work in ISRs, on some MCUs, but it is a bad idea.

12

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