“Scoppy is an oscilloscope and logic analyzer powered by your Android phone/tablet and Raspberry Pi Pico. Signals are measured by the Pico and the waveforms are displayed on the Android device. No programming is required and both the app and firmware are free to download. Installation is super easy and should only take a few minutes.
The aim of the Scoppy project is to give electronics novices and hobbyists access to an ultra-ultra cheap oscilloscope that is useful for viewing low voltage, low frequency signals. Scoppy is also a logic analyzer with a sample rate of 25MS/s.”