Hi Can anyone help with this problem? I started out being sure that this sketch had a problem with the ISR, wire, or the ICM42688 HW/library, but now it seems that using the serial monitor and these commands below, is the problem if (Serial.available() > 0) { receivedDataMonitor = Serial.read(); …

It turns out this was a a whole different problem, esp32 fails if no correct return in functions https://github.com/espressif/arduino-esp32/issues/5867

Serial monitor problem

Official Hardware Nano Family Nano ESP32

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Serial monitor problem

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