ESP 32 is not able to control mg90s servo

Other Hardware Motors, Mechanics, Power and CNC
1

Hi There, i am working on building rc car using esp32 and xbox controller, i am able to connect the controller to the board, but somehow the servo which i am using is mg90s and it doesnt work with it, no matter what different library i use, can someone help me in that?

2

How is the servo powered ?

3

I think you need to read the pinned post re 'How to get the most from the forum'

4

Sharing code, circuit , power and details about components usually goes a long way in getting meaningful input.

5

Some time ago I worked with an MG996r which is a somewhat weaker but similar servo motor. The following code may help you get started (setting right frequency and duty cycle). Try changing these parameters.

// Suppose MG996R is driven by PWM on PIN 12

void setup()
{
  Serial.begin (115200);

  /* older libraries:
    seledcSetup (0, 50, 10);  // set 50 Hz PWM on channel 0 with 10 bit resolution
    ledcAttachPin (12, 0);  // attach pin 12 to channel 0
  */

  ledcAttach (12, 50, 10); // set 50 Hz PWM on pin 12 with 10 bit resolution
}

void loop() {
  Serial.printf ("center at %i\n", 75);
  /* older libraries:
    ledcWrite (0, 75);
  */
  
  ledcWrite (12, 75);

  delay (4000);

  for (int dutyCycle = 75; dutyCycle <= 128; dutyCycle++){ 
    Serial.printf ("right %i\n", dutyCycle);
    /* older libraries:
      ledcWrite (0, dutyCycle);
    */

    ledcWrite (12, dutyCycle);

    delay (25);
  }
  delay (2000);

  for (int dutyCycle = 128; dutyCycle >= 22; dutyCycle--){ 
    Serial.printf ("left %i\n", dutyCycle);
    /* older libraries:
      ledcWrite (0, dutyCycle);
    */

    ledcWrite (12, dutyCycle);

    delay (25);
  }  
  delay (2000);

  for (int dutyCycle = 22; dutyCycle <= 75; dutyCycle++){ 
    Serial.printf ("right %i\n", dutyCycle);
    /* older libraries:
      ledcWrite (0, dutyCycle);
    */

    ledcWrite (12, dutyCycle);

    delay (25);
  }

}
6

…which library is that one ???

for ESP32 I use the library ESP32Servo and it works great

7

No library. Pure PWM.

8

Try a different pin, pin12 is a strapping pin.
Leo