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by jelly32
Fri Jun 26, 2020 6:35 pm
Forum: ESP32 Arduino
Topic: PWM controlled fan tacho wrong
Replies: 21
Views: 5489

Re: PWM controlled fan tacho wrong

Do you have a drawing of this
20200626_203108_cr.jpg
20200626_203108_cr.jpg (552.87 KiB) Viewed 203 times
by jelly32
Wed Feb 19, 2020 7:25 pm
Forum: ESP32 Arduino
Topic: PWM controlled fan tacho wrong
Replies: 21
Views: 5489

Re: PWM controlled fan tacho wrong

Just to let you know, I had exactly the same challenge and was very happy to find this thread. I don't have an oscilloscope, but I tried a lot of combinations of pullup resistors and RC filters. I got the best results with: fan tacho out - pullup resistor 10k to 3.3V - series resistor 3.3k - capacit...

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