Use Piezo Sensor as digital input

Other Hardware Sensors
1

I am working on a project where I would like to use a piezo sensor (like Piezo Vibration Sensor - Small Vertical - SEN-09199 - SparkFun Electronics) as input.

While I could connect the sensor to an analog pin, I would rather connect it to a digital pin (as I only need a binary value).

The big question is....how would I go about that ?

The sensor can output a +/-90V AC charge, and I suspect that I will need to scale that down to a 5V charge.

I am not especially strong when it comes to resistors etc. So any help is much appreciated.

2

You should stay with analog readings and 'digitize' in your software.

Converting to external digital would require some circuitry and lose flexibity such as easy threshold adjustment.

3

You should stay with analog readings and 'digitize' in your software.

At the moment I am just trying different approaches, but I would eventually like to be able to read two sensors at the exact same time. I can accomplish this through portmanipulation, but that requires the signal to be digital.