This is a functional/interactive fan made prop from the game phasmophobia. It detects ghost activity in the game. This one uses a magnetometer to detect magnetic field strength and behave similarly to the one from the game.

Parts

• Arduino Nano
• gy-271 magnetometer
• Buzzer (piezo speaker)
• LEDs (just used an extra yellow instead of orange)
• Momentary Push Button Switch
• Resistors for LEDs, buzzer, button
• Toggle power switch
• Battery and charging module scavanged from a power pack: https://www.amazon.com/dp/B083VRD7CX "Portable Charger 5000mAh" - totally overkill but also really convenient

I got a bunch of stuff from amazon and https://protosupplies.com/ (late 2021, great website and service imo).

More info

https://www.heuristic42.com/blog/52/making-a-real-emf-reader/

Software

https://github.com/pknowles/emf_reader