When it comes to percussion, [JimRD] has another idea: keep the beat by pounding the soundboard with a solenoid. He built a simple Arduino-driven MOSFET circuit to deliver knocks of variable BPM ...

An Arduino Uno converts serial over USB output to a bit stream ready to clock into the shift registers. On the computer side, [Chris] wrote up a basic CUPS driver which allows him to print from ...

Every eight solenoids, there’s an Arduino and a motor shield. The resulting junior player piano sounds like someone playing wind chimes like a xylophone, or a tiny Caribbean steel drum.

Arduino Nano. Capacitive soil moisture sensor. Raspberry Pi 3. 5V solenoid water valve + relay. Workflow: Arduino checks moisture and sends readings to the Pi. A Python script on the Pi decides when ...