Vimal I think it is an interesting exercise to build your own H-Bridge, but at the end of the day I would suggest an IC bridge. They are just so easy to use. I have used L293,L298,LMD18200.. The L293D is good for 600ma, or the L293N for 1A which is adequate with a reasonable motor. Some of the cheaper motors tend to draw a lot more stall current than this. The L298 is good for 2A, the LMD18200 for 3A, as I remember. It is very common to drive the DC motor with significantly higher voltages than it is rated at. This improves the torque of the motor, and therefore the acceleration of the mouse. Some of the h-bridges around can happily cope with supply voltages as high as 40V - not sure about the bridge you have built. Let us know your motor type/resistance/stall current and we could probably offer more advice. Tony ________________________________ From: owner-micromouse@cs.rhul.ac.uk on behalf of Vimal Shankar Sent: Sun 14/01/2007 6:07 PM To: micromouse@cs.rhul.ac.uk Subject: RE: DC Geared motor control > CCP1 and CCP2 are both driven from the same timer > source, Timer 2. The period of both PWM1 and PWM2 is > set by PR2. > > The pulse-width of PWM1,PWM2 si set independently by > CCPR1L:CCP1CON[5:4] and CCPR2L:CCP2CON[5:4]. > PWM1 is on pin RC2 > PWM2 is on pin RC1 .. strange, but that's how it is. > > So yes, you can have two independent pwm lines. Tony, I thank you for a VERY well written summary of what I had been trying to understand. Thank you. I am using the McManis bridge and a PIC to control it.. any edge cases you would like to point out using this combination. For a final mouse, maybe I will do myself a favour and get a few LMD18210T... any pointers ? This forum rocks. ____________________________________________________________________________________ Finding fabulous fares is fun. Let Yahoo! FareChase search your favorite travel sites to find flight and hotel bargains. http://farechase.yahoo.com/promo-generic-14795097
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