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.

An Arduino Uno provides the processing power and drives the serial monitor. A joystick and a Hitachi H48C accelerometer are mounted on a breadboard and wired to the Uno.

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.