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[on:]

Hi, i want to control my RC car with arduino, so I need to control motor's speed and direction. Because motor draws about 10 Amps, I cannot use H-Bridge. Is there any easy way to do this?

[Reply #1 on:]

H-bridges made of discrete components can handle a lot of current.

Your RC car should have an H-bridge in it already.  Cannibalize that.

[Reply #2 on:]

H-bridges at that current level are available, just a little pricey and possible larger then will fit in your car. If you don't need reverse for the car then speed control can be simple and inexpensive using a logic level mosfet transistor of suitable voltage and current rating and driving it with a arduino pwm output pin. It's not known to us how your car presently controls it's motor speed and if it could be modified for Arduino control or not.

Lefty

[Reply #3 on:]

Even if you do need reverse, its just three more FETs to get an H-bridge.  10-20A FETs can be found for 0.50-1.00$

[Reply #4 on:]

10A+ DPDT relays will reverse direction (occasionally and not quickly; probably fine for fwd/reverse.)  It's probably a toss-up whether that would work out cheaper than a "real" H-bridge...

[Reply #5 on:]

10A+ DPDT relays will reverse direction (occasionally and not quickly; probably fine for fwd/reverse.)  It's probably a toss-up whether that would work out cheaper than a "real" H-bridge...

You could control forward and reverse that way, but without adding an extra relay, you couldn't control on/off! So, it would be better to use a couple of SPDT relays instead of a single DPDT...

You wouldn't have PWM control, but you might be able to put on the low side a power FET or transistor, and PWM that, and switch direction with the relays; the whole thing could probably be done under $15.00 USD...

[Reply #6 on:]

I have completed that using tamyia TEU-101BK controller, which is just 4 MOSFETs and it even supports PWM. It is a little bit expensive (30$), but I have it from RC car I am hacking, so why not?

[Reply #7 on:]

I have completed that using tamyia TEU-101BK controller, which is just 4 MOSFETs and it even supports PWM. It is a little bit expensive (30$), but I have it from RC car I am hacking, so why not?

Well, ok - but why did you post here to begin with if you are just using the controller it came with (as mspguy noted)?

 :-?

[Reply #8 on:]

I meant that a DPDT relay would add "reverse" to a conventional single-direction speed controller...

[Reply #9 on:]

I meant that a DPDT relay would add "reverse" to a conventional single-direction speed controller...

Ah - gotcha...