it is somehow possible to read the frequency of the input signal in one anolog PIN? Bcs I know that analogRead gives me a response of the input signal voltage. I have a sinusoide that goes from 20mV to 2.7V and I really like to detect is frequency with arduino. I have seen some question similar to mine but the answer where more about the componet to have a positive voltage that about the effective way of how to do it.
Anyone know it?