This hack takes advantage of all of these aspects to bring you an Arduino controlled CGA monitor. One problem with experimenting with one of these monitors is that they are not that well documented.

Piunara is a tiny computer that beats with the heart of a Raspberry Pi 4 Compute Module, but features a carrier board with Arduino features.

Internally his heart rate monitor is using an Arduino Pro Mini, a small OLED screen, and a turn-key pulse sensor which was originally conceived as a Kickstarter in 2011 by “World Famous ...

He uses a cheap, $12 sensor with an Arduino and a Radiation shield and monitors the data on his computer.