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RoHS

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

DEV-MD25_connection.jpg


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

DEV-MD25_dimension.gif



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

Technical Specification - link to the manufacturer

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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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Order online now

EUR 45.98 EUR 38.64
Price incl. VAT Price excl. VAT
plus EUR 5.95 shipping costsplus EUR 5.00 shipping costs

Immediate delivery

Available for immediate delivery while stock lasts.

5 in stock
updated: 18.09.2018

Information on currency

EUR 45.98 = GBP 40.95 EUR 38.64 = GBP 34.42 (€1=GBP0.89068)
EUR 45.98 = USD 53.22 EUR 38.64 = USD 44.72 (€1=USD1.1574)
EUR 45.98 = CAD 70.03 EUR 38.64 = CAD 58.85 (€1=CAD1.5231)
EUR 45.98 = AUD 74.99 EUR 38.64 = AUD 63.02 (€1=AUD1.6310)

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