Last week, we saw a giant Raspberry Pi board working. Now, the smallest Pi board has been used to create a tiny but fully-functional keyboard.
Hackday.io users couldn’t find a small keyboard to be used with very small computers or wearables. So he made one. It’s about the same size as three pennies stacked in a row.
It is made using a PCB that has been placed directly on top of a Raspberry Pi Pico. This allows for a 59-key keyboard with a 51-by-21mm area. The letters are printed directly on the PCB for each of the keys. The keycaps are unavailable, so you can only use your fingers to type on the tiny tactile switches. Pico handles key matrix decoding and has a USB interface.
Although you might not want to use this keyboard for long periods, it can be useful and portable. The price is not high either. TEC.IST states that each keyboard will cost around $20 if you add the Pico.
Hackaday has all the files required and a list of components. Even a video walkthrough for the CircuitPython code made the keyboard functional.