The Uno, on the other hand, is much bigger. It weighs more than three times the Nano at 25 grams and has a larger footprint, with a length of 68.6 mm and a width of 53.4 mm.

The build relies on the classic Arduino Uno microcontroller, which talks to a HC-SR04 ultrasonic sensor module and two infrared sensors in order to track a human target and follow it around.