Massive 7:1 scale Arduino UNO gets matching 7:1 scale turtle robot — May 16th, 2026 A few months ago, UncleStem built a completely functional 7:1 scale Arduino UNO Rev3 development board. That was a big hit, for obvious reasons. But what can you do with an Arduino of that size? The answer is: create a matching 7:1 scale turtle robot for it to control. This is a great pairing, because turtle robots are often the first big projects that new Arduino users tackle — usually soon after blinking an LED. Just like with the oversized Arduino, UncleStem wanted to honor that tradition with the power of enlargement.  He started by building a classic example of a normal-sized turtle robot from a kit. That is, of course, controlled by an UNO Rev3. The Arduino turns the two motors through an L298N dual H-bridge driver and avoids obstacles using an ultrasonic sensor. The ultrasonic sensor is on a servo-actuated panning mount, so it can “look around” for the optimal path when it runs into anything.…