Just for fun - probably not a substitute for spending a thousand dollars on a real one. Zoom into waveforms, being read from the Meowbit pins.
Brief video showing it reading a 0-3.3V signal twiddling a potentiometer.
up/down buttons change the y-scale
left-right buttons change the x-scale
A/B buttons offset the wave up and down the screen
By default it’s in ‘simulation’ mode where you can look at a precalculated sine wave, if you don’t have a circuit to actually connect to the pins or you don’t want to.
Press Menu to begin reading voltage on pin 0 instead.
Tie GND to ground otherwise you’ll get floating voltage noise probably.
ENSURE the voltage is only in the 0-3.3V range. You will probably harm your device if you don’t.