The Gong Door Bell
I Wifi-enabled a cheap wireless door bell from a chinese shop using an EMP32-WROOM-32. I took out the horrible speaker, and added an EMP32-WROOM-32 to detect the electronic chime. This connects to the Wifi and communicates to another EMP32-WROOM-32 which will via an Arduino (because that's what I had) to a stepper motor to operate a Gong.
