Small motor controller/driver with variable speed

Community General Discussions
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1

Hello, i'd like to have some small driver/controller like the L293D or similar, but that can run motors at variable speed. Does it exists ? A small and cheap board would be ok.

If it doesn't, how could it be built ?

 

Thanks :P

2

The L293D

You can use the chip you have. Just drive the enable pin with PWM (really fast on and off). If your enable is on 50% of the time, the motor will turn about 50% the speed of when enable is always on (which is what you have right now).

-Fergs

3

uhm really ?i’m a bit

uhm really ?

i’m a bit confused… i thought that for making them run slower than the nominal speed you have to give less voltage. How does pwm works ?

4

Look here (in italian)

Look here (in italian) http://www.tmasi.com/robotica/pwmtut/PWMTut_H.htm

 

5

uhm grazie :)i completely

uhm grazie :slight_smile:

i completely missed all that part about PWM… That’s the problem of learning by yourself :slight_smile: So i can now build my own motor controller, great