Link here

Stand-Alone Operation
Using the Motor Control Wildcard as a stand-alone speed controller

You can use the board in stand-alone mode, without needing to connect it to a computer. In stand-alone operation you can command motor PWM or speed by providing an analog voltage signal, or by simply connecting a potentiometer.

  1. An externally applied analog voltage or potentiometer provides the setpoint, which commands either the PWM duty cycle directly, or the speed using a PI control loop. Switches on the two direction input lines determine the motor direction or braking.
  2. The motor is turned OFF or fully ON in either direction by applying a digital input or switch closure to one of two digital inputs.
  3. Switches on the setpoint inputs may be used to set fixed speeds or PWM duty cycles.

See also →

This page is about: H-bridge PWM Motor Controller Driver for Raspberry Pi and Other Single Board Computers – In stand-alone operation the h-bridge motor controller board is used with the Raspberry Pi and other computer boards to control the PWM, speed and direction of DC motors. PWM duty cycle can be digitally set or speed controlled by a PID control loop. Motor control, DC motors, PWM duty cycle control.