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Author Topic: Advice on choosing a motor controller chip please  (Read 695 times)

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Offline jaden845Topic starter

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Advice on choosing a motor controller chip please
« on: July 16, 2012, 06:43:20 AM »
Hi.

I am beginning to build my first robot and am looking to build a motor controller circuit using the H-Bridge configuration. I shall be using the PIC18F4520 http://docs-europe.electrocomponents.com/webdocs/0806/0900766b80806cf6.pdf along with a 9V battery and 2x DC motors rated at 9V with a caster wheel at the front of the robot.

Could anyone please advise me of a reasonably straightforwards motor controller chip that would work with my microcontroller and the H-Bridge configuration?

Thanks

Offline pterrus

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Re: Advice on choosing a motor controller chip please
« Reply #1 on: July 16, 2012, 01:55:06 PM »
The L293D has worked well for me and is really easy to set up.

Offline jaden845Topic starter

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Re: Advice on choosing a motor controller chip please
« Reply #2 on: July 16, 2012, 03:21:04 PM »
Ok thanks JR I shall give one a try and let you know how I do!

Offline Soeren

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Re: Advice on choosing a motor controller chip please
« Reply #3 on: July 16, 2012, 06:52:57 PM »
Hi,

The L293D (600mA max) has got a high voltage drop (up to 3.6V), so you may end up with as little as 5.4V for the motors (with a fresh battery).

Try the FAN8200 series (Fairchild) instead, if the current is below 650mA. It comes in four variants:
FAN8200 = 650mA max.
FAN8200MTC = 550mA max.
FAN8200D = 400mA max.
FAN8200MP = 350mA max.
(Each will drive 2 separate DC motors)

If your motors need more current, you need something else of course, but there's so many motor driver chips that it wold be pointless mentioning any without knowing the current your motor takes when loaded.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline jaden845Topic starter

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Re: Advice on choosing a motor controller chip please
« Reply #4 on: July 17, 2012, 07:01:06 AM »
Soeren,

Thanks for your input. I shall decide on the motors to use and bear that in mind.

 


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