Alt-BEAM Archive
Message #04603
To: beam@sgiblab.sgi.com
From: SG sparkyg@seark.net
Date: Thu, 17 Jun 1999 17:49:58 -0400
Subject: [alt-beam] Re: 245 driver / reverser in 1 chip
Ian's Reverser on his "Compleate Walker schematic" do the same thing.
Reverser only changes gait on one motor, ( i asuume intended to be rear)
-Sparky
At 08:07 PM 4/20/99 +1000, you wrote:
>Here's a circuit I designed that uses the direction pin on a 245 to swap the
>polarity of the rear motor on a two motor walker. I'm pretty sure it will
>work, but I haven't built it yet. Basically, for the rfront motor, the
>driver is normal. One driver for each of the poles on the motor. But it uses
>another two, who's outputs have the microcore output on them as well, and
>the inputs of these gates got to the motor, so when the chip reverses the
>front motor remains in the sam direction. For the fron motor however, 2
>outputs from the microcore go to the input of one gate, and the output of
>another gate. The outputs and inputs of these gates respectively go to the
>motor, however unlike with the front motor, the rear motor's second set of
>drivers is reversed (the ones coming from the "inputs" of the second set of
>drivers); so when the chip's direction pin is enable (from a reverser sensor
>etc), the drivers reverse direction and the rear motor's polarity changes,
>Making the walker go backwards.
>
>
>Any comments? What do you guys (and girls) think??
>
>
>
>
>____________________________________________________________________________
>I really need to come up with a good saying.....
>ICQ#24602841
>http://www.geocities.com/TimesSquare/Cavern/9282/
>
>
>
>Attachment Converted: "C:\PIPEPLUS\DOWNLOAD\245 reverser-driver.gif"
>
------------------------------------------------------------------------
eGroups.com home: http://www.egroups.com/group/alt-beam
http://www.egroups.com
- Simplifying group communications
Home