Small motor controller/driver with variable speed
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
@ Mon, 2008-11-10 15:00
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
@ Mon, 2008-11-10 15:29
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 ?
@ Mon, 2008-11-10 16:14
Look here (in italian)
Look here (in italian) http://www.tmasi.com/robotica/pwmtut/PWMTut_H.htm
@ Mon, 2008-11-10 17:16
uhm grazie :)i completely
uhm grazie :)
i completely missed all that part about PWM.. That's the problem of learning by yourself :) So i can now build my own motor controller, great