wireless temp monitor

Discussion in 'The Projects Forum' started by odps, Nov 15, 2009.

  1. odps

    Thread Starter New Member

    Nov 15, 2009
    3
    0
    Looking for a kit or circuit design

    I need to monitor the water temp of an outdoor wood burner wirelessly.

    I bought a Grill Right Wireless BBQ/Oven Thermometer, Oregon AW-131 that worked fairly well, but it had some drawbacks. The transmitter has an 8 hour auto power off. Once it auto powers off, you have to go through a reset procedure to "restart" it. I need to monitor 24-7. Also, it went haywire and started displaying incorrect temp by + 60 deg F.

    I would like to build a unit from scratch.
    I would like to power the transmitter circuit with a 12 vdc supply,
    monitor temps 32°F to 572°F
    Transmit wireless up to 100'
    build a receiver circuit that would display temp on an LCD display, and power the receiver/ display unit with 3.2vdc

    Does anyone know of a kit or a source for a schematic?

    Any info appreciated....

    Thanks
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Sounds like you'll need a thermocouple for temps that high.

    Perhaps the way to start would be to look at some application notes for microcontrollers.
    Microchip has a line of uC's that have RF transmit/receive capability.

    Here's an app note on simplified thermocouple interfacing with PICs:
    http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en012021

    Here's an app note on single supply temp sensing with a Microchip PIC:
    http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en011706

    Here's a link to Microchips' wireless offerings:
    http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=76
     
  4. odps

    Thread Starter New Member

    Nov 15, 2009
    3
    0
    Thanks for the help guys... really appreciate that...

    Yes, a Thermocouple... probably type J ??

    Anyone know where I might get a schematic for a transmitter and a receiver/display circuit that will do the job?
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    The Microchip site has LOTS of datasheets and application notes; and many source code examples.

    You will likely find something that is reasonably close to what your needs are that it can be adapted.
     
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