User Manual

Version 1.5 - December 11, 2010
4
output of the connected sensor outputs properly reflects the current through the bridge in
either direction. A close up of the SENSOR jumper block is shown in Figure 3.
Figure 3. Current sensor jumper block
When operating in H-bridge mode the jumper shown in red above may be placed to link the
current sense outputs of both chips. A second jumper chooses which Arduino analog pin to
connect to this combined signal. If operating sensing of the individual half-bridge current
outputs is desired the red jumper above is not placed and two jumpers are used to connect
each power chip current sense output to a different analog input pin. See the application
examples section for more details. The current sense output is optional and need not be
connected if monitoring of the load current is not desired.
Power Connections
Motor Outputs: The MegaMoto circuit is two independent half-bridge circuits mounted on a
single PCB. The two motor outputs may work together to form a full H-bridge for bi-directional
drive of a motor or other load or each half-bridge may be used independently. The MA output
is controlled by the PWMA input and the MB output is controlled by the PWMB input. The
MegaMoto does not function with a PWM and Direction input. The screw terminal and the
solder pads on each side are tied together and either or both may be used to power the load.
Battery Inputs: The MegaMoto requires an external battery connected to the BAT + and –
inputs. This battery is not connected to the Arduino positive supply and cannot be used to
power the Arduino. There is no voltage regulator on the MegaMoto. The MegaMoto does not
require external filtering or voltage regulation. It may be used directly with a 6V-28V battery or
other voltage source. Connections can be made using either the screw terminal or solder
pads or both.