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 ...

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 ...

A 3-way AC solenoid valve, wired directly to the buttons, selects one of the three functions, while a temperamental bimetal switch keeps the boiler roughly between almost there and way too hot.