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ESP32 and Pulse Counter Answered

Hi.

I can't find a small simple code to know if I receive pulses of a signal from an ESP32 pin.

The pulses are about 100ns in amplitude and can be of variable frequency between 100 and 6000Hz.

I just know if that pin is receiving pulses, I don't need to count them or anything else.

Can you help me, please.

Greetings

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