The Arduino Uno-compatible board has an MCS-51 (often called 8051 instead) instead of the usual ATmega328P/ATmega168. Specifically, [ElectroBoy] uses the AT89S52 .

The build relies on an Arduino Uno as the brains. It’s equipped with an L293D motor driver shield to run two DC gear motors which drive the walking assemblies.

The Arduino UNO R4 is scheduled for release in Late May at which point we’ll get the full features and pricing of the new 32-bit Arduino board, but if you have an Arduino library developer, you could ...