User Manual

Version 1.5 - December 11, 2010
6
PWMB D3 Timer2 PWM2B
Current Sense A0 Bridged Both halves of the bridge report current on
A0
H-Bridge mode is the most common configuration for driving DC motors. It allows each
MegaMoto to drive one DC motor in forward and reverse with variable speed. Each Arduino
base unit can support up to three stacked MegaMotos and hence three independently
controlled motors.
Dual Half-bridge Mode Example
Figure 5. MegaMoto half-bridge mode
Function Jumper Notes
Enable 5V Both power chips are always enabled and
cannot be disabled via program control
when the jumper is in this position.
PWMA D6 Timer0 PWM0A
PWMB D10 Timer1 PWM1B
Current Sense none Current monitoring is not used so all analog
pins are available for other applications.
Half-bridge mode is used for uni-directional loads such as fan motors, pumps, lights, solenoids
and other loads that don’t need to reverse direction. A single MegaMoto may control two
motors independently in this mode. Also, a brushless motor may be controlled using two
MegaMotos to provide three half-bridge circuits. Three MegaMoto units can supply six half-
bridges so two brushless motors may be controlled by a full stack of three MegaMotos on a
single Arduino base.
Ganged Half-bridge Mode Example