Adafruit motor shield

Dc drive

Servo control

So this is the us robotics motor controller. It can be used for driving dc motors, servos and stepper motors. There are 4 input pins and upto 6 wire controlled outputs. There is also external power that must be connected to function. The inputs are A and B plus minus. This allows you to either use a pwm signal to control the movement or send a constant signal to have steady drive and the polarity is determined by which input receives a signal.

Stepper drive, forward, rev, and high speed! Give constant high to both a and b makes it run fast! Did not know that until I tried.