Alt-BEAM Archive

Message #04577



To: "mailing list" beam@corp.sgi.com
From: "Ben" mesiti@pbq.com.au
Date: Tue, 20 Apr 1999 20:07:34 +1000
Subject: [alt-beam] 245 driver / reverser in 1 chip



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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??




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Attachment: 245 reverser-driver.gif

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