Uses a photo resistor to determine whether a room is bright, average or dark. It shows this using 3 LEDs and/or the serial monitor.

Measure humidity and temperature levels in your home to avoid unhealthy air quality with this fun project.

The TrafficLight is a project that has Arduino-powered LEDs Blinking like a traffic light.

Using Teensy (small Arduino) to power NeoPixels off of an electric skateboard battery.

A simple, original and cheap Christmas tree made with LED-illuminated plastic straws that can be controlled over WiFi.