PWM problem with GPIO25 on ESP32-WROOM-32D

Using Arduino Motors, Mechanics, Power and CNC
1

Hi,
I use one PWM servo motor MG90S (0-170 degrees) and if I turn on the ESP32-WROOM-32D, I will set 0 degrees without any problems, I will also set 170, but I always have to reset the GPIO25. The servo motor starts to rotate spontaneously. The GPIO25 is a PWM pin.
On ESP32 I use wifi for webserver, but it should connect to ADC2 and not to PWM, which should work.

I perform measurements only every 10 minutes and yet the 170 to 0 degree command did not work properly. It remained at 170 degrees.
I use this library: https://github.com/RoboticsBrno/ServoESP32

      // servo ON
      Serial.println("SERVO 170");
      servo1.attach(SERVO_PIN, Servo::CHANNEL_NOT_ATTACHED, 0, 170);
      for(int posDegrees = 0; posDegrees <= 170; posDegrees+=5) {         
          servo1.write(posDegrees);
          Serial.println(posDegrees);
          delay(10);
      }
      gpio_reset_pin(SERVO_PIN); // off PWM
      
// we measure 

      // servo OFF
      servo1.attach(SERVO_PIN, Servo::CHANNEL_NOT_ATTACHED, 0, 170);
      for(int posDegrees = 170; posDegrees >= 0; posDegrees-=5) {
          servo1.write(posDegrees);
          Serial.println(posDegrees);
          delay(10);
      }
      gpio_reset_pin(SERVO_PIN); // vypneme PWM
2

How is the servo powered ?

3

The whole code please. Snippets do not troubleshoot well.

Analog to Digital Converter (ADC) - ESP32 - — ESP-IDF Programming Guide latest documentation (espressif.com)

4

Power is 5V.

Video with problem:
https://youtu.be/MY3jy4v96HE?t=5

The code used, which is recorded on video:

#include <Servo.h>

static const int servoPin = 25;

Servo servo1;

void setup() {
    Serial.begin(115200);
    servo1.attach(servoPin);
}

void loop() {
    for(int posDegrees = 0; posDegrees <= 170; posDegrees++) {
        servo1.write(posDegrees);
        Serial.println(posDegrees);
        delay(20);
    }

    for(int posDegrees = 170; posDegrees >= 0; posDegrees--) {
        servo1.write(posDegrees);
        Serial.println(posDegrees);
        delay(20);
    }
}
5

post a pic of your project.

6

image
image1165×975 82.1 KB

7

You are actually powering the servo through/from the ESP32 board via the USB? The ESP32's steering diode will be damaged.

8

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