RC car motor controlling

Other Hardware Motors, Mechanics, Power and CNC
1

Hi i'm new to arduino so this is probably a noob question but i'm trying to learn as much as i can as i plan on turning this old radio shack car i've found into a ardiuno based wifi or r/c car.

my question is would a motor shield handel a ni-cd 7.2volt 1200MAH battery running the large DC motor it has? or even more mah as my understanding is as long as the discharge rate doesn't increase too much i should be able to get a high mah rating and it would just last longer. For steering it appears to just be a single smaller dc motor running off of just the 4 aa batterys which also control the r/c unit.

The picture is the current board it has my plan is to replace that with the arduino board and hopefully a rc controller or xbee for wifi controls.

IMG_0450 (305 KB)

2

Use a multimeter to measure the current draw of the motor, stalled. That should be worst-case. Get a motor control shield that can handle the current.

You can probably re-use the H-bridge circuits of the RC car. Unsolder the radio chip and look for the pins that go to the big transistors (or to the little transistors that go to the big transistors). Try pulling those pins high or low to see what combinations run the motor in which direction.

3

ntroduction to the RC car electric motor that both RC trucks and cars use. ... What speed controller do I need to use with my rc electric motor? ...
www.rc-truckncar-tuning.com/rccarelectricmotor.