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Temperature control — Parallax Forums

Temperature control

mz7thcmz7thc Posts: 2
edited 2006-03-22 01:27 in BASIC Stamp
Hi there,
I need to control the temperature of an electric heater.
The temperature must change over time.
I think this should be possible using the BASIC Stamp but I never worked with it and I don't know where to begin and what parts I need for this application.
Hope someone can help.

Comments

  • Bruce BatesBruce Bates Posts: 3,045
    edited 2006-03-20 08:22
    mz7thoc -

    Externally, what you would need would be an appropriately sized solid state relay (SSR) to control the heater, and you will use a Stamp pin port to drive it (ON and OFF). Yhen you will need a temperature sensing element. There are a number of thermostat IC's available, and one of the ones often used with the PBASIC Stamp is the Maxim/Dallas DS-1620/1621 although there are dozens from which to choose:
    http://para.maxim-ic.com/cache/en/results/5120.html

    The Stamp will continually poll the temperature/thermostat IC to see when to turn the SSR ON or OFF. There isn't a whole lot more to it, if that's the limit of what you need to do. If necessary, the temperature section of the thermostat can be queried on a regular basis, to ensure that freezing isn't about to occur, which might happen with a faulty heater, or blown line voltage fuse/breaker.

    Regards,

    Bruce Bates

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    Post Edited (Bruce Bates) : 3/20/2006 10:56:36 AM GMT
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-03-20 15:16
    What is the temperature range of the heater?· In other words, are you trying to measure room temperature or the actual element/output temperature of the heater?· Do you need a probe-based solution or will an IC solution work?

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • mz7thcmz7thc Posts: 2
    edited 2006-03-20 20:31
    Chris,
    I have to control the temperature in an temper oven for curing fiberglas. The maximum will be 60°C. The temperature has to rise from room temp to the maximum at about 2 degrees per hour. I think an IC thermostat will be fine. Would be nice to check the temperature at more than one spot.

    Regards

    Hans
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-03-20 21:14
    Hans,

    ·· Actually at 60C I think you're going to need a probe.· That's 212F.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • Fe2o3FishFe2o3Fish Posts: 170
    edited 2006-03-20 23:58
    No it's not, Chris.
    100°C ==> 212°F
    60°C ==> 140°F

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    -Rusty-
    --
    Rusty Haddock = KD4WLZ = rusty@fe2o3.lonestar.org
    **Out yonder in the Van Alstyne (TX) Metropolitan Area**
    Microsoft is to software what McDonalds is to gourmet cooking
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-03-22 01:27
    Rusty,

    ·· Somehow I misread my trusty CONVERT.EXE program...Ah well...Yes, then it could work!· =)

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
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