Building radio receivers from scratch is still a popular project since ... and everything is controlled by an Arduino including a small LCD screen which displays the current tuned frequency.

Scratch, and Python — compared to just C/C++ on the Arduino. Pairing this with the Pi's 64-bit quad-core processor, one can write complex code to achieve multi-functional programs. For example ...

and his goal was to build a Forth interpreter / compiler from scratch, put it into a Blue Pill microcontroller. That accomplished, he naturally decides to squeeze it into an Arduino Uno with only ...