how to generate PWM pulse

[phoneminnwai]

hbridge_theory.pdf

hello all of my friends
i want to know how to generate PWM pulses and control DC motor movement : forwards , reverse and braking with PWM.
welcome ur reply
thanks

 

[hr_rezaee]

hi
some mcu such as AVRs can generate PWM.
there is some ICs that also can generate PWM.
search the web.

 

[IanP]

Generating PWM pulses is not that difficult. Get 555 timer and some external components to set frequency and duty-ratio, and off we go --> see schematic below ..
However, this will be only one-direction speed control ..
If you use the PWM signal to control a bridge, H-bridge, in fact, you will be able to drive a dc motor Forward-Stop-Reverse ..
Follow this link: http://www.robotroom.com/HBridge.html to see how it works ..
For more advanced H-bridge application controlled by a microprocessor goto:
http://matthieu.benoit.free.fr/moteur2.htm
**broken link removed**
etc. etc.

Regards,
IanP

 

[jymoo30]

U jz need to change the direction of motor without changing the speed control right?

It's simple program and can be made it by C with PIC microcontroller since it has PWM output.