what is the driver circuit i can use it to control in DC motor and make the robot move forward and backward ? (components of the circiut and the drawn of it , please)

 

yes . H-Bridge

 

http://en.wikipedia.org/wiki/H-bridge

Have you not heard of Wikipedia or Google, you lazy oaf?

 

thanks , what the diferrence between H-Bridge L293D and L298 ?

 

thanks , what the diferrence between H-Bridge L293D and L298 ?
and what is the thing that is called PWM and what is the purpose of it ?

 

Look at their datahseets which can be found on Google.

PWM means pulse frequency modulation, it's used for motor speed control, and yes you've guessed it, Google to the rescue.

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I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.

Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.

 

you can make a simple h-bridge with sl100 and sk100 mosfets..2 each for 1 motor ..

 

PWM is based on the notion that the integral over one period of a periodic waveform is the average value of that periodic waveform. You do what an integral is...right?

 

Well, he isn't smart enough to try using Google to get some answers, so he probably doesn't know what an integral is.

 

i am really use google to find information that i need it but i want you to explain this information to me and general , Thanks alot

 

While I deplore the rudeness of people, you really aren't listening to them. The information is out there. Do you really expect some one to go to the effort of explaining it to you here when there are really good, clear explanations 2 or 3 clicks away??? And do you seriously think that you will learn it faster or better by playing 20 questions?

You say you know how to search but it's clear you don't know what to do with the results of the search. One can't help but conclude that the word lazy was not applied in error.

 

PWM is called Pulse width modulation

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You could also just by an h-bridge with built a built in controller. Then just send the right comands over some kind of bus, depending on the type of h-bridge you get of course. I seem to remeber at least devantech has one of these, using a simple i2c buss interface.

 

They both can drive up to 2 motors bi-directional, or 4 motors unidirectional.

the L298 has more power output and high currect sensors to shut down the device in case of excessive load.

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