The PROCON board is a complete dual channel motor controller. It was designed as the propulsion controller for Gemini. The main computer gives simple commands such as forward, stop, turn right, etc. The PROCON implements these commands while detecting collisions, stopping and informing the controlling computer.

PROCON controls two DC motors in both forward and reverse at variable speeds. The board consists of a microprocessor controlling dual PWM channels. The polarity of each channel can be switched to reverse the motor. The PROCON board communicates through an RS-232 serial port and so it is simple to control it with any personal computer.

Here is a link to the schematic in PDF format for the PROCON board.

Here is a picture of the complete pc board.

Following are some tables with the specifications and the command set for the PROCON board.