Alt-BEAM Archive
Message #04579
To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: "van Zoelen, Bram SSI-TSEA-352" Bram.A.A.vanZoelen@is.shell.com
Date: Thu, 17 Jun 1999 12:55:02 +0200
Subject: [alt-beam] Re: 245 driver / reverser in 1 chip
Isn't this in the FAQ already?
I think soo.
Bram
> ----------
> From: Ben[SMTP:mesiti@pbq.com.au]
> Reply To: beam@sgiblab.sgi.com
> Sent: Tuesday, April 20, 1999 12:07 PM
> To: mailing list
> Subject: 245 driver / reverser in 1 chip
>
> <>
> 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/
>
>
>
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