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IO Expansion HAT x1 for Raspberry PI, PWM not working

Unread postPosted:Fri Mar 27, 2020 5:01 pm
by dick
I have a Raspberry Pi 3B+.

I enable pwm in /boot/config.txt
Code: Select all
dtoverlay=pwm-2chan

When I use PWM in the code I can see the changes in the /sys/class/pwm/pwmchip0 folder (period, duty_cycle, enable), but the PWM output does not change.

Do I need to install/configure extra stuff for the PWM on the hat to work?

Re: IO Expansion HAT x1 for Raspberry PI, PWM not working

Unread postPosted:Mon Mar 30, 2020 1:18 am
by nana.wang
Hi Dick,
thank you for your support and contact.
Could you please check the power supply voltage of PWM mode? It should be 6V-12V.