For the last year I’ve been working on a low-cost robot design. For the recent Institute of Engineering & Technology Robot Triathlon, I adapted a controller board to take a micro:bit.
At present, the cost of the edge connector makes the low-cost element of the micro-bit design a bit hard to achieve as I’d have to buy 2,000 connectors to get them at a reasonable price. But I’m working on it.
There are two sensors that detect the line to be followed. If the left sensor is active, the left motor is stopped, making the robot back to the right, and vice-versa for the right sensor. If neither sensor is active, both motors are drive the robot forward.