Expert advice badly needed.

Hi, I am new to the electronic circuitry stuff. I Badly need some expert advice and guidance. What I am trying to do is to mod a RC car., use the Arduino Mega to control the speed and direction of the car. I followed these two tutorials. For speed control: https://learn.adafruit.com/downloads/pdf/adafruit-arduino-lesson-13-dc-motors.pdf and for direction control: https://learn.adafruit.com/adafruit-arduino-lesson-15-dc-motor-reversing/breadboard-layout. Both of them work very well on a small RC car with small motor.

Now I want to use the same circuity design on a much bigger RC truck. This RC truck has much bigger motor and battery. The battery is 9.6 V 1250mA NiMH. I used the same circuitries from the tutorials, Needless to say, the L293D chip and the PN2222 transistor couldn't handle the high current, they were all fried!

My question is what components I need to use the same circuits but can handle such high current?

Any advices and suggestions will be greatly appreciated as always. :)

Before you can begin to specify the components you need to know how much current your new motor draws.
This can be got from the motor’s data sheet or by measuring it with your meter.

My question is what components I need to use the same circuits but can handle such high current?

Typically, big RC cars have an ESC - electronic speed control - that to the Arduino looks like a servo. Most hobby shops that deal with RC vehicles have ESCs that will be compatible with your truck's motors.

Thank you all for your replies. I was Googling around, I realized that there is something called Motor Shield, would the motor shield simplify the problem?

would the motor shield simplify the problem?

The motor shield would contain new smoke. I'm pretty sure you'd let it all out in nothing flat.

I thought the motor shield is base on the L298N, which can handle up to 2A of current according to the data sheet, was I wrong?. There is also a version on eBay, but that was base on the same L293D I used which will difinitely turn into smoke.

RC truck motor might take much more than 2A peak. Need to find out what the max current draw is before buying a motor driver, or you might be wasting your effort.

rich1812:
Hi, I am new to the electronic circuitry stuff. I Badly need some expert advice and guidance.

http://forum.arduino.cc/index.php/topic,148850.0.html

pay particular attention to #6