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this is my first time working with Pi and I'm trying to control a single motor (closely following this tutorial: https://www.youtube.com/watch?v=OV0S_3KMj2A).

Specs are:

  1. Raspberry Pi 3 Model B+
  2. 5V DC motor
  3. MX1508 Dual H Bridge motor driver

Problem is, as soon as I power-up the Pi, the motor turns on on its own. The only instance when it is under control is when I run my program to get it working (where I have defined start/stop instances). As soon as I KeyboardInterrupt the program, the motor starts running again.

  1. I've been recommended to use a pull-down resistor, but it did not work.
  2. I've tried with other GPIO pins, same result.

Wiring: wirings

Program:

import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

pwr = 80
GPIO.setup(2, GPIO.OUT)
motor = GPIO.PWM(2, pwr)

while True:
    motor.start(pwr)
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  • 1
    If you want help explain what YOU have tried and how it is connected. I would rather poke my eyes out than look at youtube.
    – Milliways
    Commented Apr 22 at 12:42
  • 1
    Post your code and a photo of your wiring.
    – CoderMike
    Commented Apr 22 at 13:07
  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking.
    – Community Bot
    Commented Apr 22 at 17:15
  • Did you try adding a short delay at the beginning of your code? If not, plz try this. If you think of using L293D instead, you can find relevant code and circuit diagram here: theengineeringprojects.com/2022/04/…
    – liaifat85
    Commented Apr 22 at 21:13
  • @CoderMike and all, kindly check the updated post for codes and wiring schematics. Thanks!
    – peacer
    Commented Apr 23 at 1:58

1 Answer 1

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It is hardly surprising that the motor runs on boot.

GPIO2 has a 1.8kΩ pullup resistor intended for I²C so it will always be HIGH.

It is unclear what the unspecified device will do in this situation.

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  • Many thanks, @Milliways. Your expertise was valuable to me.
    – peacer
    Commented Apr 23 at 10:15
  • @PrithulChaturvedi this might help forums.raspberrypi.com/viewtopic.php?t=167734
    – jsotola
    Commented Apr 24 at 3:31
  • Thanks, @jsotola! I changed my GPIO pin to a pin that was PWM compatible and it works fine now
    – peacer
    Commented Apr 25 at 2:19
  • @PrithulChaturvedi please post an answer describing what you did, so that other people can benefit from your knowledge
    – jsotola
    Commented Apr 25 at 2:21

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