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I have project that works with raspberry pi 3 which control a motor speed through PWM0 pin (GPIO 19), the problem is that raspberry pi give high state after startup , which cause the spinning of the motor at low speed ( because the PWM is giving low duty_cycle value ) ,i want to avoid this by making PWM0 pin (GPIO 19) give low state during booting and after start ,that will prevent the motor from start spinning , unless i started its script that will give the PWM0 high state .

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    Try writing in sentences. Without some idea what you have actually done it is difficult to work out what you are asking.
    – Milliways
    Oct 27, 2021 at 1:06
  • 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
    Oct 27, 2021 at 9:02

1 Answer 1

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GPIO 19 will never be high and will not be a output unless you do something to make it so.

All pins are initially configured as inputs with either pullup or pulldown; in this case GPIO 19 is configured as input with pulldown.

NOTE again GPIO 19 is NOT a "PWM0 pin" and won't unless you configure it.

You can configure a pin shortly after boot, using the gpio option in config.txt, but this would be a sledgehammer approach to solve whatever is actually wrong.

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  • Thank you for your reply , I forget that i forced this gpio to be output , using (sudo nano /etc/rc.local) , now I removed what I wrote and it works , now the gpio 19 not sending any thing after start , But after activating PWM at GPIO 19 using (sudo nano /boot/config.txt) it becomes neither Output nor Input ,it is ALT5 that's what the (gpio readall ) command gave me as a result , and the problem appear again the PWM is sending signal after startup .
    – 0ussama
    Nov 2, 2021 at 15:08

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