Nothing much to say, really. You set period (in ns), duty_cycle (in ns), and then enable it (which turns on).

Eg. I can beep an mini-buzzer salvaged from old PC at 500Hz.

cd /dev/bone/pwm/1/a
echo $((2*1000*1000)) > period # 2ms
echo $((1*1000*1000)) > duty_cycle # 50%
echo 1 > enable

To turn if off,

echo 0 > enable

Eg. Driving LED with it, I can see LED get brighter or dimmer, by changing duty_cycle.

On 2025-12-10 01:22, Steve Litt via Talk wrote:

William Park via Talk said on Tue, 9 Dec 2025 21:27:32 -0500

 * PWM (pulse width modulation) -- eg. turning on buzzer

Please tell us more about PWM. That can be used for almost lossless
voltage control, speed control, and a whole lot more.

Thanks,

SteveT

Steve Litt 

http://444domains.com

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