DC Motor Speed Control

Forum 2005-2010 (read only) Hardware Interfacing
1

I've used an H-Bridge to control motors going forwards and backwards with the arduino. Now I'd like to also be able to control the speed of the motors in either direction. I researched a bit and found a MOSFET may be needed, but can you bypass the MOSFET by sending PWMs from the arduino?

If a MOSFET or some other external hardware is needed, a link/instuctions to such a circuit would be much appreciated.

Thanks!

2

I think it is possible to use PWM with the H bridge you already have.

3

Interesting, thanks. link? tutorial? further help?

4

Not sure if this is any help, but I've been playing with this motor shield:
http://www.ladyada.net/make/mshield/

It's quite substantial and the library that comes with it allows you to easily control things like motor speed and such. Example being: motor.setSpeed(255);

5

TRy to check this at instructables :

http://www.instructables.com/id/Ard-e-The-robot-with-an-Arduino-as-a-brain/

6

well what hbridge are you using?

I've used PWM before to control a Hbridge. i used the L298 HBridge chip. I just made sure I was using PWM lines on the arduino and used the analogWrite function

7

Thanks for the links. I'm using a L293NE from ti. So just pulse the hbridge with some pwm to control the speed?