The Flipper Zero can make use of the GPIO to output electrical signals and act as a signal generator. I last used this to simulate an antilock braking technique module with a vehicle to verify that each one the wiring and computer systems in the car have been working. The https://flipperzeroaccessories54074.full-design.com/the-smart-trick-of-flipper-zero-geiger-counter-that-nobody-is-discussing-78690306