Interrupt pins stay triggered when powering on Stepper Controller

[hhelmbold]

I just started using the ESP32 and having issues using interrupt pins. All of this is working on an Arduino board but I would like to switch over to the ESP32. I have 2 Hall Effect switches connected to pins 32 and 33. The Stepper motor is on pins 16 (DIR), 17 (PUL) and 4 (ENA)

The Stepper motor works when I test it with a simple sketch (Nema 42 using a Microstep Driver DM556S). The Hall Effect Switches works when I test them with a simple sketch, but if I power on the stepper motor's power supply the interrupts immediately gets triggered. As a newby this is really confusing me. Attached is an image of the layout and the code will follow.

With the power to the stepper motor OFF and running the sketch I get "Triggered" when the magnet moves over the Hall Effect Switches. The moment I turn on the power to the stepper motor I just get an endless loop of "Triggered" in the serial monitor.

Code: Untitled.cpp Select all

const byte RightHallPin = 33;

const byte LeftHallPin = 32;



void setup() {

  Serial.begin(115200);

  pinMode(LeftHallPin, INPUT_PULLUP);

  pinMode(RightHallPin, INPUT_PULLUP);

  attachInterrupt(digitalPinToInterrupt(LeftHallPin), chgdir, RISING);

  attachInterrupt(digitalPinToInterrupt(RightHallPin), chgdir, RISING);

  Serial.println("Initialised");

}



void chgdir() {

  Serial.println("Triggered");

}



void loop() {

  delay(1);

}

[Sprite]

Do you have an oscilloscope you can connect to the Hall sensor output pins? Sounds like you're getting interference from the steppers on those lines.

[hhelmbold]

Unfortunately not... and doing this as a hobby I admit I don't always know what I am doing. I also think it is interference...

I have also tried a simple digital pin sketch that will display 0 or 1 for the Hall Effect switch, not using interrupts, just using the basic loop function and a delay(200).

The result is that it will display 0 for a while, then display 1, then display 0, then display 1 - all this without a magnet, so it does look like it is interference which I don't get on the Arduino boards. But I also know the Arduino boards has some extra resistors etc built onto the board which the esp32 doesn't have.

I think my question is maybe what can I add to reduce this interference?

[hhelmbold]

UPDATE - I placed a 104 Ceramic capacitor over the Gnd and VIN wires of the Hall Effect Switch and this is giving better results. It seems like it is more stable and I can use the switches for now. Not sure if this is the correct solution, but it's working for now.