|
The Robot Power MegaMotoTM is a low-cost robust
H-bridge "shield" for the ArduinoTM and hardware compatible base
units. The standardized shield format stacking headers allows multiple MegaMoto units to be controlled by a single Arduino Uno
or Duemilanove using pass-through stacking
headers.
The MegaMoto is the first and only
motor control for Arduino that gives users the ability to control up to 30A
of current at up to 28V. That's over 800W of power! At
last Arduino users can easily control high-current, high-power motors for
robotics, scooters & Segways, industrial
controls and many other applications by using their familiar development
environment and without messy, unreliable "lash up" type
connections to discrete motor controls.
The MegaMoto is a dual half-bridge
circuit that can be configured either has a full H-bridge or as two
independent half-bridge circuits. This allows a single MegaMoto
to drive one motor with full variable-speed control both forward and
reverse. It also allows two independent motors to be controlled in a uni-directional fashion by connecting one side of each
motor to the battery negative and the other motor lead to one of the MegaMoto outputs.
The true flexibility of the MegaMoto
is shown when multiple units are stacked onto a single base Arduino unit.
Jumpers are used to select which Arduino signals drive the Enable and PWM
inputs on each MegaMoto. This flexibility allows
the MegaMoto to play nice with other shields
which might require the use of certain pins. 
Since the Uno and Duemilanove have
six hardware PWM outputs, up to three MegaMoto
units may be stacked on a single Arduino base unit. This allows forward and
reverse control of up to three motors or up to six motors in half-bridge
mode. Arduino Mega and some units based on other CPU chips have more PWM
outputs available and thus may be able to control even more MegaMotos.
Each half-bridge on the MegaMoto is
independently controlled so stacking two or three MegaMoto
units allows an Arduino to drive three-phase brushless or stepper motors as
well as DC brushed motors. Not limited to motors, the MegaMoto
can control other DC loads such as lights, solenoids, relays, valves, Peltier junction coolers, Hydrogen generators or
basically any DC device within the operating voltage and current range.
The MegaMoto has the following specifications and
features:
|
Supply voltage
|
5V to 28V (24V max
battery rating)
|
|
Output Current
(continuous)
|
13A
|
|
Output Current
(surge)
|
30A 5 seconds
|
|
Weight
|
1.3 0z
|
|
Power chips
|
2 ea. BTN7960B
|
|
On Resistance
|
.016 ohm max at
25C
|
|
PWM Frequency
|
DC to 20kHz
|
|
Logic Interface
|
3V - 5V , minimum
1 pin required
|
|
Logic Inputs
|
Jumper select
Enable and PWM source
|
|
Current Sense
Outputs
|
0.0745V per Amp - 2.98V
at 40A
|
|
Current Sense Pins
|
Jumper select the
analog input connected
|
|
Current and Temp
Limiting
|
Built in to power
chips
|
|
Power Connectors
|
2 each screw
terminals (14AWG wire)
& solder pads for power wires
|
|
Enclosure
|
None
|
A User Manual
and Schematic diagram
are available for more detailed information.
Robot Power offers the MegaMoto fully assembled and tested. Check the Web store for details on prices and special offers.
|
