For crazy hacking sessions in seconds, this Oscilloscope with fingertip probe mounted on forearm [aniketdhole] It may be exactly what you need. Maybe will.not very clear why You might want to wear an oscilloscope on your arm and stick your fingers into a powered electronic device. It sounds particularly like something your mother might tell you not to do, but anyway.
The oscilloscope consists of an nRF5340 evaluation board in a 3D printed stand, with an Adafruit 2.8-inch TFT display connected to SPI on the top. A pair of wires are led out from the ADC and ground pins of the circuit board, [aniketdhole] It only takes a bit of code to glue them together and display some basic signal visualization on the display. It has been tested against the PWM signal generated by the Arduino and the voltage controlled by some potentiometers, but in the current configuration, the requirements for this equipment may be a bit excessive.
In the future, [aniketdhole] I want to add some step-down circuits so that you can detect voltages higher than what nRF5340 normally handles, and shunts that allow current measurement. Once the hardware is in place, the next task will be an improved user interface with touch functionality, allowing users to adjust settings and switch between functions.
Even if you don’t agree with the idea of arm-mounted oscilloscope, this is still an interesting platform for general wearable experiments. Put enough sensors into it, and we are sure that many hackers don’t mind installing one of them.