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The Robot Power MegaMoto PlusTM
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 Plus units to be
controlled by a single Arduino Uno or Duemilanove
using pass-through stacking headers.
The MegaMoto Plus is the first and
only motor control for Arduino that gives users the ability to control
multiple motors at up to 40A of current and up to 28V. That's
over 1100W 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 Plus 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 Plus 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 Plus
outputs.
The true flexibility of the MegaMoto
Plus 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 Plus 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
Plus 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
Plus is independently controlled so stacking two or three MegaMoto Plus units allows an Arduino to drive
three-phase brushless or stepper motors as well as DC brushed motors. Not
limited to motors, the MegaMoto Plus 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 Plus has the following specifications
and features:
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Supply voltage
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5V to 28V (24V max
battery rating)
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Output Current
(continuous)
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20A (25A with fan)
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Output Current
(surge)
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40A 5 seconds
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Weight
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1.3 0z
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Power chips
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2 ea. BTN7960B
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On Resistance
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.016 ohm max at
25C
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PWM Frequency
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DC to 20kHz
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Logic Interface
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3V - 5V , minimum
1 pin required
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Logic Inputs
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Jumper select
Enable and PWM source
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Current Sense
Outputs
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0.0745V per Amp -
2.98V at 40A
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Current Sense Pins
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Jumper select the
analog input connected
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Current and Temp
Limiting
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Built in to power
chips
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Power Connectors
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2 each screw terminals
(14AWG wire)
& solder pads for power wires
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Enclosure
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None
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A User Manual
and Schematic diagram
are available for more detailed information. Note, the schematic and User
Manual from the MegaMoto apply to the MegaMoto Plus as well. The only differences besides the
increased power handling on the Plus are a few minor lettering and location
changes.
Robot Power offers the MegaMoto Plus fully assembled and tested. Check the Web store for details on prices and special offers.
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