Chris Gregg has created a fantastic printer using a retro classic mechanical typewriter which can be used as a printer thanks to the power of the Arduino platform ...

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.

The Arduino Opta is an open-source programmable logic controller normally intended for industrial automation. Here, its silent solid-state relays drive the solenoids, as [Jeremy]’s done before ...