1 x L293D motor driver; 1 x HC-05 Bluetooth module; 1 x 16MHz Crystal ; ... L293D Motor Controller IC. The purpose of using this IC is to control the direction for the motor and also the speed of ...

Because students are using it, it needs to be short-circuit-proof – no possibility that a mix-up in control signals can cause the drive to short out the rails (see DANGER, right). BTW, don’t use these ...