DC motor—external driver

For DC motors, the Caterpillar board does not drive the motor directly either. Instead, it outputs a PWM speed signal and a direction (DIR) signal to an external DC motor driver (H-bridge), which handles the higher current the motor needs. Any DC driver that accepts PWM + DIR control at 3.3 V logic is compatible.

Tested driver

• Cytron MD13S—13 A continuous (30 A peak for up to 10 s), 6–30 V motor supply, PWM (up to 20 kHz) + DIR control, 3.3 V/5 V logic; built-in overcurrent, undervoltage, and thermal protection.