MD25 - Dual 12Volt 2.8Amp H Bridge Motor Drive
For 2 EMG30 motors
Devantech
Designed to work with our EMG30 gear motors, the MD25 will drive two motors. Controllled by Serial or the I2C Interface. Two modes of operation, direct individual control of the motors or the ability to send a speed and a turn commands.
Overview
The MD25 is a robust I2C or serial, dual motor driver, designed for use with our EMG30 motors. Main features are:
- Reads motors encoders and provides counts for determining distance traveled and direction.
- Drives two motors with independent or combined control.
- Motor current is readable.
- Only 12v is required to power the module.
- Onboard 5v regulator can supply up to 1A peak, 300mA continuously to external circuitry.
- Steering feature, motors can be commanded to turn by sent value.
- Variable acceleration and power regulation also included
Connections
Motor Voltage
The MD25 is designed to work with a 12v battery. In practical terms, this means the 9v-14v swing of a flat/charging 12v battery is fine. Much below 9v and the under-voltage protection will prevent any drive to the motors.
Motor Noise Suppression
When using our EMG30 encoded motors, you will find that a 10n noise suppression capacitor has already been fitted. Other motors may require suppression. This is easily achieved by the addition of a 10n snubbing capacitor across the motors. The capacitor should also be capable of handling a voltage of twice the drive voltage to the motor.
Leds
The Red Power Led indicates power is applied to the module. A Green Led indicates communication activity with the MD25. In I2C mode the green led will also initially flash the address it has been set to. See I2C documentation for further details.
Board dimensions
Serial / I2C Select - Important Note
For I2C connection, on MD25 board go to the Serial/I2C Select and make sure that you have not installed any jumpers on this Select (if any connections are made, remove the jumper). Make SDA & SCL connections with cables from SDA (serial data) to SDA (serial data) and from SCL (serial clock) to SCL (serial clock). For clear explanation regarding I2C connection please see the Manufacturer's data linked below.
For serial connections, jumpers are installed according to the clock speed on the serical / I2C Select. Serial connections are made with cables from Rx (receiver) to Tx (transfer) and from Tx (transfer) to Rx (receiver). For clear explanation please see the Manufacturer's data linked below.
I2C commands in Linux
Install I2C on your computer and enable it. Then use for example the following simple commands:
~# i2cdetect -y 0
This command detects the devices (if you're using multiple devices, mention the number of devices which are connected in place of '0').
~# i2cset -y 0 xxxx 255
This simple command writes the byte value 255 to the I2C device at address xxxx hex on the i2c bus 0 (/dev/i2c-0).
~# i2cget -y 0 xxxx
This command reads a byte from an I2C device at address xxxx hex on the i2c bus 0 (/dev/i2c-0).
Manufacturer's data
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Product information for: MD25 - 12V 2.8A Dual H-Bridge Motor Driver
Publishing date (date of last technical specification): 2010-11-10
Weight: 24 g
Shipping weight: 50 g
Manufacturer: Devantech
Brand: ROBOT ELECTRONICS
Article number: DEV-MD25
Manufacturer's part number: MD25
The article MD25 - 12V 2.8A Dual H-Bridge Motor Driver is listed in the following categories:
Drives > Motor control
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updated: 05.01.2021
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About ROBOT ELECTRONICS
ROBOT ELECTRONICS is a brand by English manufacturer Devantech Ltd., based in Norfolk. Product range comprises sensors, in particular ultrasonic or compass, servocontrollers as well as small robot drive systems or relay modules with various interfaces. Sensors are produced in England and are of consistently high quality.
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