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auto-off to save battery charge — Parallax Forums

auto-off to save battery charge

allniteallnite Posts: 2
edited 2009-09-15 15:06 in Propeller 1
i would like the propellor to turn the circuit off to save battery life. I would like to turn the circuit on using a momentary contact switch, then to turn off the circuit with a signal from the controller. I believe this "auto-off" ability should be a common problem, but i haven't been able to find any information on the web! any help is greatly appreciated!

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2009-09-14 01:02
    There are several such circuits that have been posted in the past. I don't have a link. You'll just have to browse the Propeller forum's threads. It was a year or so ago.

    Make sure to try the Google search engine (search.parallax.com) with a variety of keywords.
  • TimmooreTimmoore Posts: 1,031
    edited 2009-09-14 01:43
    I dont have the links but I did save a couple of circuits from the threads. If you want a re-built circuit pololu sell one http://www.pololu.com/catalog/product/750

    Post Edited (Timmoore) : 9/14/2009 1:48:58 AM GMT
    poweroff.gif
    1305 x 669 - 120K
    poweroffswith.gif
    849 x 863 - 89K
  • Beau SchwabeBeau Schwabe Posts: 6,568
    edited 2009-09-14 03:24
    Both of those circuits are from my original drawings ...

    The first circuit "poweroff.gif" is an original concept for the Propeller where the power "on" latency needed to be accounted for.
    Reference:http://forums.parallax.com/showthread.php?p=730612


    The second circuit "poweroffswitch.gif" is an improved version over the first, and designed to operate under a lower input voltage.
    Reference:http://forums.parallax.com/showthread.php?p=812900

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    Beau Schwabe

    IC Layout Engineer
    Parallax, Inc.
  • allniteallnite Posts: 2
    edited 2009-09-15 15:05
    Thank you for the drawings! This is exactly what I was looking for. I will try them and let you know how it goes.

    It bewilders me that this is not a more popular problem.
  • mctriviamctrivia Posts: 3,772
    edited 2009-09-15 15:06
    many of the people here do not worry about power savings. evident by the fact most use linear regulators.

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