Unpredictable PWM behaviour when powered via 5v pin

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fnoguez
Posts: 6
Joined: Mon Sep 07, 2020 2:03 am

Re: Unpredictable PWM behaviour when powered via 5v pin

Postby fnoguez » Wed Sep 23, 2020 2:29 am

Hi
Maybe 1.92v is to low for the expected threshold 3v? try shifting the PWM high signal with gates, 2 NPN transistors in series as gates
or something similar. I attached a drawing that works for me . The common GND for both sides can be omitted if you want to isolate the MCU.
Hope this help
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opto01.png
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