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simple product needed I have $100(garage thermostat) — Parallax Forums

simple product needed I have $100(garage thermostat)

mctriviamctrivia Posts: 3,772
edited 2013-12-24 14:17 in General Discussion
If anyone is interested in making 1 I am interested in buying.

I need simple faceless thermostat which I can set a temperature between 0 and 63 deg Fahrenheit with dip switches. it must be able to mount inside a standard electrical box(I can provide drawings) I can provide 3 wire power(12v, heat, ground)

Comments

  • kwinnkwinn Posts: 8,697
    edited 2013-12-13 16:10
    I may have something that can be modified to do that. What sort of signal do you need for the heat? Dry contact to ground, 12 to 0 volts, or something else?

    PS - What quantity do you want?
  • mctriviamctrivia Posts: 3,772
    edited 2013-12-13 18:52
    In my garage I am installing a 4000w 240v heater. For controls I have 2 5a 12v coil relays which control the fan and a large 30a contactor to control the heater. They are wired up so it is impossible for the heat to run without the fan but the fan can run without the heat. To operate these I need a 12v dc signal for fan and 12v dc for heat.

    I personally only need 1 but may be able to sell a few to friends. and hopefully designer can sell lots
  • kwinnkwinn Posts: 8,697
    edited 2013-12-14 00:08
    I have a small board that I glue to the back of a blank light switch plate to monitor temperature in areas. I could make a modified version of that for you and add it to my next order. What sort of current and voltage output does the heat signal need to be? My main concern is with the transistor that drives heat signal. Since it needs to be in the box with the temp sensor it will affect the reading to an extent.
  • max72max72 Posts: 1,155
    edited 2013-12-14 05:37
    Analog device tmp01 is probably your solution.
    Add a dip switch and tailored resistances and you are (almost) set....
    Massimo
  • kwinnkwinn Posts: 8,697
    edited 2013-12-14 23:49
    @max72

    Thanks for posting that, it is probably a better solution than what I had in mind, and I might have a use for it in another application.
  • T ChapT Chap Posts: 4,223
    edited 2013-12-15 09:47
    I use a MAX6634 I2C device. It is very easy to use, 8 pin SOIC. It has programmable trip points or you can easily set your code to trip the fans/heat. This could be fairly easily hand soldered with small diameter wire without a board for testing it out. I have code for the Prop that reads the temp and allows you see the result in binary output, F, or C values. With any Prop board you would be up and running in a short time.
  • mctriviamctrivia Posts: 3,772
    edited 2013-12-24 14:17
    DSC_0425.jpg


    Using analog device tmp01 this is my modification of diagram 18 on page 11 of data sheet. Will it work any thoughts?
    DSC_0425.jpg
    1024 x 768 - 97K
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