A step-by-step guide to setting up the Arduino IDE for NodeMCU boards, from installing the board package to your first Blink test.
Turn Arduino into an adjustable on/off timer set with a potentiometer, with a safety note for controlling mains-voltage loads.
Use nearby Wi-Fi network scanning and a cloud geolocation service to estimate a geographic location with NodeMCU, no GPS module required.
Build a clap- or loud-sound-responsive lighting system using an LM393-based sound sensor.