Connecting servo controller to h-bridge

Hey guys,

I've got one of these ebay servo controllers ...

http://www.torobot.com/down/usc_en.pdf

... I'm wanting to hook up 4 of the channels to a h-bridge IC (L293), so I can use some of the channels to control 2 motors. Is this possible?

I tried just hooking up the servo singal wire directly to the L293, but the motor runs all the time.

I'm guessing I need to somehow build a circuit that translates the PWM signal - the servo controller lets you specify a range from 500 - 2500 (for the servos), so ideally this would translate to 0%-100% duty cycle for the L293.

If this isn't possible, or is too hard, then is there a simple way to make a digital on/off given a PWM signal threshold?

I hope this makes sense. Any ideas guys?

Cheers,
Mike

 

I was thinking perhaps feeding the pwm signal to a voltage reading IC, which sends the serial data to a serial-parallel IC, then using the bits of the IC to feed to h bridge IC. Seems abit sloppy though. Is there a simpler way?