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