ESP8266 Community Forum

- Tue Nov 14, 2017 7:01 pm #71848 Hello,

First of all I wanted to say "hi!" as this is my first post here

I've spend the entire day a trying to drive a NEMA 17 stepper motor with a NodeMCU board via an L298N driver.

When using an Arduino UNO board, the motor works perfectly, however when I try to run the same code on a NodeMCU board, it causes a hw wdt reset

ets Jan 8 2013,rst cause:4, boot mode:(3,6)

I've been looking in Google for a solution but no luck so far, I wasn't able to find anyone driving a NEMA 17 with a L298N driver with the Stepper.h library.

Has anyone here been able to drive such a motor with the same driver and library? I would really appreciate any kind of help.

Setup:

• A Coil: D1 + D2
• B Coil: D3 + D4
• A PWM: D5
• B PWM: D6

- Tue Nov 14, 2017 9:55 pm #71849 A common cause for WDT reset is a loop which runs too long. No problem on Arduino, but won’t work on esp8266. If I recall correctly, doing anything for 50ms or more, without a call to yield() or delay(), will cause WDT reset.


Without knowing what code you’re running, it cannot be determined whether the trouble is in the sketch, or the library.

- Thu Nov 16, 2017 3:50 pm #71897 I was so frustrated I did not try to get it working again until now and... IT WORKS!

Find below the code I used for the test:

Code: Select all#include <Stepper.h>

const int stepsPerRevolution = 200; 
Stepper myStepper(stepsPerRevolution, D1,D2,D3,D4); 

int enA = D5;
int enB = D6;

void setup() {
  pinMode(enA, OUTPUT);
  pinMode(enB, OUTPUT);
  // establece la velocidad en 60rpm
  myStepper.setSpeed(60);
  // inicializa el puerto serial
  Serial.begin(9600);
}

void loop() {
  analogWrite(enA, 700);
  analogWrite(enB, 700);
 
  Serial.println("clockwise");
  myStepper.step(stepsPerRevolution);
  delay(500);
 
  Serial.println("counterclockwise");
  myStepper.step(-stepsPerRevolution);
  delay(500);
  analogWrite(enA, 0);
  analogWrite(enB, 0);
  delay(9000);
}

Thank you for your help anyway!!!