I am trying to find the optimum electrical design for my project.
The project is a remote control vehicle that is moved by 2 DC motors, controlled by an arduino MC and powered by 2 X 12V 4Ah batteries.
Motor 1: 24V, 200watt, rated current- 14A. Motor 2: 24V, 10watt, 1A
To control the speed of each motor I bought a Dual DC driver module. http://www.ebay.com/itm/3V-36V-Dual-Motor-Driver-Board-Module-H-bridge-DC-MOSFET-IRF3205-15A-Peak-30A-/171205708868?hash=item27dca7cc44:g:JKEAAOSwR0JURgQC
For testing I have been running the motor driver and arduino off separate sources. But the vehicle needs to run everything off the 2x12V batteries.
I know I need to drop the Voltage down for the arduino, but I don't know the best way to do it. I don't want to be wasting power, as the vehicle needs to travel a specified distance therefore power efficiency is important.
Note: I thought maybe to tap off from one of the batteries so that I am only dropping from 12V, more research stated this will cause unequal battery power and is not a good option. Is this correct?
Any suggestions are greatly appreciated. I am unsure of noise and filtering so any insight here would be much appreciated too.