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Question on BASIC STAMP HomeWork Board - using the servo with wall pack — Parallax Forums

Question on BASIC STAMP HomeWork Board - using the servo with wall pack

ChilesChiles Posts: 15
edited 2008-12-24 07:50 in General Discussion
BASIC STAMP HomeWork Board - using the servo with wall pack


I have a regulated 9vdc 1amp power supply - couldn't I use this in place of the battery?
thanks in advance and I wont blame anyone for damage! -I will just buy another one




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Comments

  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2008-12-23 15:21
    Chiles,

    It is not recommended to do so. In the servo application when you’re powering the servo from the 9V battery, it is technically being over-powered. In this case it is for proof-of-concept and while it does reduce the life of the servo some, it is not going to damage it in the short term. Most wall adapters, however, run at higher voltages than what they are rated at when not at full current load. So your 9V wall adapter may be putting out 14-16 volts. And really, anything over 9 volts will pretty much damage the servo. Depending on which revision of the Homework Board you have, you could use the on-board regulator though. If your board is Rev C or higher, you should be able to connect you wall adapter to the 9V terminals and get servo power from VDD. I hope this helps. Take care.

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    Chris Savage
    Parallax Engineering
  • ChilesChiles Posts: 15
    edited 2008-12-24 04:40
    Thanks! I will just use a 9 volt batt then.
  • Mike GreenMike Green Posts: 23,101
    edited 2008-12-24 05:12
    A 9V battery is just as bad as a 9V wall adapter (for the servo) except that the battery will become exhausted quickly driving it. As Chris mentioned, you can run the servo off of Vdd (5V) if you have a Rev. C HomeWork Board, but it's best to use a 6V AC adapter rated at 1A or more and connect the servo to Vin (6V). The Stamp's regulator will work just fine from 6V.
  • ChilesChiles Posts: 15
    edited 2008-12-24 07:50
    Ok and Thx, so anyways I have the Revision D HomeWork Board and have done all the experiments in the book with the servo with a 9 volt Battery. But eventually I will be running everything off of an AC power supply. So I will probably get by fine with 2 amps of regulated +6 volts to run up to 4 servos? My project is going to be tied to a desktop computer and doesn’t need to run around free of cables or anything like that.
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