This compact expansion board plugs directly into the GPIO header on a Raspberry Pi B+, Pi A+, Pi 2, or Pi 3 and provides an easy and low-cost solution for driving a pair of small brushed DC motors. Its integrated DRV8835 dual motor driver allows it to operate from 1.5 V to 11 V, making it a great control option for low-voltage motors. The board can deliver a continuous 1.2 A (1.5 A peak) per motor, or a continuous 2.4 A (3 A peak) to a single motor when configured with both channels connected in parallel.

Overview

This motor driver kit and its corresponding Python library make it easy to control a pair of bidirectional, brushed DC motors with a Raspberry Pi Model B+, Model A+, or Pi 2 Model B or Pi 3 Model B. The expansion board features Texas Instruments’ DRV8835 dual H-bridge motor driver IC, which allows it to operate from 1.5 V to 11 V and makes it particularly well suited for driving small, low-voltage motors. The board can deliver a continuous 1.2 A per channel and tolerate peak currents up to 1.5 A per channel for a few seconds, and the channels can be optionally configured to run in parallel to deliver twice the current to a single motor. The board ships fully populated with its SMD components, including the DRV8835 driver and a FET for reverse battery protection; header pins for interfacing with a Raspberry Pi and terminal blocks for connecting motors and power are included but are not soldered in (see the Assembly with included hardware section below).

The board uses GPIO pins 5, 6, 12, and 13 to control the motor driver, making use of the Raspberry Pi’s hardware PWM outputs, although the pin mappings can be customized if the defaults are not convenient. Note that it is designed specifically for newer versions of the Raspberry Pi with 40-pin GPIO headers, including the Model B+, Model A+, Raspberry Pi 2 Model B and Raspberry Pi 3 Model B; it is not practical to use this expansion board with the original Raspberry Pi Model A or Model B due to differences in their pinout and form factor.

Features

Dual-H-bridge motor driver: can drive two DC motors or one bipolar stepper motor
Motor supply voltage: 1.5 V to 11 V
Logic supply voltage 2 V to 7 V
Output current: 1.2 A continuous (1.5 A peak) per motor
Motor outputs can be paralleled to deliver 2.4 A continuous (3 A peak) to a single motor
PWM operation up to 250 kHz (ultrasonic frequencies allow for quieter motor operation)
Two possible interface modes: PHASE/ENABLE (default – one pin for direction, another for speed) or IN/IN (outputs mostly mirror inputs)
Board can optionally power the Raspberry Pi base directly through add-on regulator (not included)
Python library makes it easy to get started using this board as a motor driver expansion board
GPIO pin mappings can be customized if the default mappings are not convenient
Reverse-voltage protection on motor power supply
Under-voltage lockout and protection against over-current and over-temperature

Assembly with included hardware

Before the motor driver board can be plugged into your Raspberry Pi, female headers must be soldered into the appropriate holes. The kit ships with a 2×17-pin 0.1” female header that should be mounted to the bottom of the board (the side with surface-mount components). Once the kit is assembled, it should be plugged into the leftmost position on the Raspberry Pi’s 40-pin GPIO header, leaving six pins exposed on the right, as shown in the picture below.

https://www.pololu.com/product/2753

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