2023-12-03, 08:13 PM
Hi @Sailoog , I have been struggling with the Gpio pulses setup to monitor engine rpm. I have made a circuit with an optocoupler as suggested Baileys, and have testet both the input pulses from the alternator and the output of the optocoupler going from 111hz to 400hz. For some reason Gpio pulses reads half the pulses, starting from 55, and tops at 95pulses. For some reason it’s unable to read higher frecuencies. I have tried different approaches to see if it’s a matter of signal noise but have failed. My tester has no problem reading the frecuencies. Y guess it has to do with the Gpio reads… any suggestions ? I have run out of options.