24byj-48 bipolar mod not working with esp 8266

[azurion28]

Hello,
I recently tried to automate my blind using an esp 8266 and some 24byj48. After my first prototype, I realized that the motor was short of a little bit of torque. I found online that converting it to a bipolar motor could solve my issue.

I ordered what was needed for the conversion and to power everything and tried to power my motor but it did not work. I know it is possible because I have seen some people doing it online but mine won't.
Here's my schematic

And here is the simple code (only used to test the motor):

#include <Stepper.h>

// Configuration des broches
const int stepPin = 5;    // Broche pas du moteur
const int dirPin = 6;    // Broche direction du moteur   (pin inferieur)
const int sleepPin = 7;  // Broche sleep du driver

// Configuration du moteur
const int step = 2048;
const int speed = 1000; // Vitesse du moteur en pas par seconde

// Création de l'objet Stepper
Stepper stepper(64, stepPin, dirPin);

void setup() {
  // Configuration des broches en sortie
  pinMode(stepPin, OUTPUT);
  pinMode(dirPin, OUTPUT);
  pinMode(sleepPin, OUTPUT);

  // Activation du driver (en mettant la broche sleep à HIGH)
  digitalWrite(sleepPin, HIGH);

  // Définir la vitesse du moteur
  stepper.setSpeed(speed);
}

void loop() {
  // Faire avancer le moteur d'un tour
  stepper.step(step);

  // Attendre 1 seconde
  delay(1000);
  // Faire reculer le moteur d'un tour
  stepper.step(-step);

  // Attendre 1 seconde
  delay(1000);
}

Please note
-I managed to make it work on my arduino Uno R3 with the same schematic (except that the ground of the a4988 is on the second board's ground and I I adjusted the voltage to 7V).
-I don't think that my esp 8299 is dead because I have the same issue with an esp32.
-As you can see in the code I tried to connect the sleep and reset pin to the arduino but it did not change.
-I also tried to use a 100uF capacitor on the 12v circuit and a 10uF on the 3.3v but it did not resolve the issue.

Thanks for your help

bipolar mod i saw (uused for blinds with an arduino uno)
same thing with an esp 8266 (basically what i am trying to do)

[MaximoEsfuerzo]

Didn't you forget to connect D7->SLP/RST?
Or is it a mistake in the schematic?

[azurion28]

I did not draw it in the schematic because as I understand, it isn't necessary. However I tried with the connection and without it with no luck

[MaximoEsfuerzo]

The simulation in wokwi runs well on ESP32 (it does not simulate ESP8266).
I do not know what the problem might be, I have several 8266s but I don't have the A4988 to be able to test it.

[kolaha]

try this

[bojan_jurca]

I'm using 5V (not 12 or 24 V !) BYJ48 for my blinds both with ESP8266 and ESP32, but with ULN2003 driver and it is quite OK. I remember having problems with the Stepper library with ESP32 board for it didn't calculate modulus as with other Arduino boards. I had to fix this.

[jim-p]

@azurion28
Did you cut the trace on the motor like they show in the link you provided?

[bojan_jurca]

Another cause of low torque may also be if the speed is too high.