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This motor driver board, originally designed by Dagu for their Rover 5
platform (Available @ RAM Store
ideal for any small 4-wheel drive robotic vehicle. With four motor outputs,
four encoder inputs and current sensing for each motor, it's a must-have when
implementing omni or mechanum wheels.
The motor drivers can be controlled by simply applying a logic 0 or 1 to the
direction pin for that motor and a PWM signal to the speed pin. In this way,
the speed and direction of four separate motors can be controlled independently
from only 8 GPIO pins. The encoder inputs on the driver board mix each pair of
encoder inputs using an XOR gate making it possible to read both inputs from a
quadrature encoder using only one interrupt pin.
Reading the current sensor output is easy, each current sensor pin will
output about 1V for each Amp of current drawn by the associated motor up to 5V.
Connect the current sensor pin to the analog input of your controller and
you'll be able to detect stalls and other motor problems.
There are two power connectors on board. One is for 5V logic and the other
is the motor supply. Be sure to turn on your logic supply before applying the
power source for your motors. The board is rated for a maximum motor supply
voltage of 12V.
- 4 x Low Resistance FET “H” Bridges
- Each Channel Rated for 4A Stall Current
- Easy-to-Use Control Logic
- Current Monitoring for Each Channel.
- Quadrature Encoder Mixing Circuitry
- 4 Channel Motor Driver Board
- Mounting Hardware