Piezo element as input for ADC
I want to measure vibration/sound with a piezo element. I am well aware that these elements can provide high voltage spikes, so usually (in Arduino projects) a 1 MOhm resistor is placed in parallel to the piezo element. But hat might not be enough for the sensitive ADC input of a LoPy, so I am thinking of also putting a large resistor in series. Any ideas?