The project if far from completed, though. What it is missing is: A test with different analog signals (I am missing an analog signal generator);...
Step 23: Test signals
To test the circuit and the Data AcQuisition (DAQ) I used a second Arduino with a simple sketch that generates square pulses with different lenghts. I also wrote a python script that talks to Girino and tells it to acquire some data series and saves one of those to a file.
They are both attached to this step.