I want a small simple board that helps kids build and control little bots or machines they build. Using parts from old broken toys such as R/C cars, trucks, boats etc. Mainly small DC motors and gear boxes. Then control it with any APP via Bluetooth.

It's simple, robust and inexpensive. No soldering required, just a pair of wire strippers, and a small flat screwdriver. No coding required to start, just plug and play. Stage 2 gives them another control option in the software. One control at a time. Then they need to iterate and redesign their prototype to accomplish the next level.

I've been developing learning environments for kids for about 9 years now, But I need help refine the circuit to be efficient and robust.