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Help- simple task, but need help. — Parallax Forums

Help- simple task, but need help.

ArchiverArchiver Posts: 46,084
edited 2000-09-21 06:29 in General Discussion
HELP.....

What is the best way to have the Stamp 2 to control a few (4 relays,
3
LED's and three Servos) external components. I already have the
servos working without any problem. With the relays and LEDS, I need
either a driver circuit or something since I do not want to burn out
the basic stamp.

Thanks

Donald Brunner

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2000-09-18 17:07
    Use an ULN2003 to drive the relays. Darlington circuit, 8 outputs, 500ma
  • ArchiverArchiver Posts: 46,084
    edited 2000-09-18 17:54
    could you be a little more descriptive?




    Lincoln J. Worsham
    liworsha@g...
    Neuro Engineering Laboratory
    NASA Ames Research Center MS 269-1
    Moffett Field CA 94035-1000
    Phone 650-604-0461
    Fax 650-604-3594

    http://www.arc.nasa.gov/computing.html
  • ArchiverArchiver Posts: 46,084
    edited 2000-09-18 20:10
    In a message dated 9/18/00 1:08:43 PM Central Daylight Time, Newzed@a...
    writes:

    > Use an ULN2003 to drive the relays. Darlington circuit, 8 outputs, 500ma

    Actually, it's the ULN2803 that has eight Darlington circuits.
  • ArchiverArchiver Posts: 46,084
    edited 2000-09-18 20:57
    Are you asking about the ULN2003?

    Sid
    Newzed@a...
  • ArchiverArchiver Posts: 46,084
    edited 2000-09-18 20:58
    You are correct! The ULN2003 only has seven.
  • ArchiverArchiver Posts: 46,084
    edited 2000-09-21 06:29
    You could use a 2N2222A transistor as a buffer for the relay. Also, Don't
    forget to use a diode across the relay to snub the falling magnetic field
    which will induce a voltage every time the relay is de-energised. I have
    also had great luck with FETs as drivers such as ZVN4206AV and VN10LP
    Good Luck,
    Gary

    g.shearer@v...
    Free Electron Laser Research Center
    Vanderbilt University
    Nashville, Tennessee
    Original Message
    From: <drb@c...>
    To: <basicstamps@egroups.com>
    Sent: Sunday, September 17, 2000 7:59 PM
    Subject: [noparse][[/noparse]basicstamps] Help- simple task, but need help.


    > HELP.....
    >
    > What is the best way to have the Stamp 2 to control a few (4 relays,
    > 3
    > LED's and three Servos) external components. I already have the
    > servos working without any problem. With the relays and LEDS, I need
    > either a driver circuit or something since I do not want to burn out
    > the basic stamp.
    >
    > Thanks
    >
    > Donald Brunner
    >
    >
    >
    >
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