AVR-Chat

Check out www.barello.net/Papers/Motion_Control

I find that using the ENABLE input gives less control over the motors.
After you have puzzled through the paper, above, then look at

www.barello.net/Papers/H-bridge.pdf

The hand drawn graphs in that paper were taken directly from an oscilloscope
screen.


Cheers!


-----------
Larry Barello
www.barello.net


| -----Original Message-----
| From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
| Of katraven1
| Sent: Saturday, August 26, 2006 11:07 PM
| To: AVR-Chat@yahoogroups.com
| Subject: [QUARANTINE] [AVR-Chat] Re: PWM for reversible DC motors
| Importance: Low
| 
| thx for that help =)
| 
| *feeling very n00b...
| 
| jst wanna confirm:
| we're using an L6203 for each H-bridge, which has 1 enable and 2
| inputs. Am i right to say that the two inputs change the direction
| of the motor?
| as in, if i put the PWM into input1, it'll go one way and vice versa
| if i put it into input2? I can't seem to find a good ref which has
| this explained clearly...
| 
| and, if this is the case.. how could I configure the other ports to
| change the direction?
| 
| --- In AVR-Chat@yahoogroups.com, dlc <dlc@...> wrote:
| >
| > The Mega32 has two PWM channels (OC's) that you should use for
| motor
| > speed.  Use one or two of the other IO lines per H-bridge to
| select the
| > direction.
| >
| > DLC
| >
| > katraven1 wrote:
| > > we have an ATmega32 connected to 2 H-bridge circuits for 2 DC
| motors
| > > which need to be reversible..
| > >
| > > we're using timer1 to generate our pwm signal and my idea was to
| use
| > > one or the other of the OC1 pins to change direction.
| > >
| > > would there be a better method of doing this? using my current
| > > thinking, the wheels would only be able to work in pairs but not
| > > independently...
| > >
| > >
| > >
| > >
| > >
| > >
| > >
| > >
| > >
| > > Yahoo! Groups Links
| > >
| > >
| > >
| > >
| > >
| > >
| > >
| >
| > --
| > -------------------------------------------------
| > Dennis Clark          TTT Enterprises
| > www.techtoystoday.com
| > -------------------------------------------------
| >
| 
| 
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| 
| Yahoo! Groups Links
| 
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