Stepper Motor Driver

Archiver

On the page
http://www.parallaxinc.com/html_files/products/BS_Accessories/little_s
tep_u.asp it talks about ULN2803A, a Darlington Array that can be
used to drive a stepper motor. The page gives sample source code but
no circuit. How do you hook a ULN2803A up to a stamp?

Thanks in advance,
Blake Benthall

Archiver

Blake,
See the Basic Stamp I Application Notes, downloadable from Parallax.
Note 6: A Serial Stepper Controller shows a clever circuit which uses a
ULN2003 and 4 resistors to control a stepper with only 2 stamp pins.
Hook up the 2803A in the same manner. I've used this circuit, and it
works well. A suggested modification is to use an extra driver in the
2803A to drive a relay to turn voltage to the motor on and off. Without
this, the circuit shown in the notes leaves the motor always on.
Dennis

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Original Message

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From: Blake [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=XsneXZTK51jGBa0uffIuxoCRKCruxLkHmmb9Ej27ZWtRBta-Y1ordeLmuh7LAE9sErpsDEpM8gqovg]blakeeb@y...[/url
Sent: Saturday, November 24, 2001 7:02 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Stepper Motor Driver

On the page
http://www.parallaxinc.com/html_files/products/BS_Accessories/little_s
tep_u.asp it talks about ULN2803A, a Darlington Array that can be
used to drive a stepper motor. The page gives sample source code but
no circuit. How do you hook a ULN2803A up to a stamp?

Thanks in advance,
Blake Benthall


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