Scare someone with a rubber spider or roach dropped right in front of their face! HalloWing with a PIR sensor and servo motor do your scaring for you!
Using MakeCode on the Circuit Playground Express to measure distance with an HC-SR04 ultrasound sensor.
Installation and configuration of reef-pi, the open source reef tank controller, capable of automating AC equipment, DC pumps, LED lights and more
Protect against intruders by building a security system for a cardboard smart home using Adafruit IO.
Build an internet-enabled environmental monitor to see what's in the air you breathe using Arduino or CircuitPython