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Using digital thermometer sensor with the SX chip — Parallax Forums

Using digital thermometer sensor with the SX chip

eagletalontimeagletalontim Posts: 1,399
edited 2008-12-12 06:30 in General Discussion
I have been trying to find some kind of documentation on how to hook up a digital thermometer temperature sensor to the SX and get a fairly accurate reading and display it on 3 7 segment displays. I can't even seem to find how to hook it and and get a reading from it. It is not a chip, it is a simple metal tip that has 2 wires coming from it. If anyone can help me get this started, I would greatly appreciate it!

Comments

  • VelocitVelocit Posts: 119
    edited 2008-12-12 01:29
    The sensor you have is likely a thermocouple. You will need a thermocouple amplifier such the AD595AQ. You can then use the SX's ANALOGIN command to read the AD595AQ's voltage through a simple circuit.

    If the sensor is just a thermistor, you can connect it directly to a sigma-delta ADC (a simple RC network) and read its resistance using the SX's RCTIME command.

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    -Paul

    Post Edited (Velocit
  • eagletalontimeagletalontim Posts: 1,399
    edited 2008-12-12 02:03
    ok, say it is a thermistor. how would I hook it up to the chip to get a steady reading off of it? I am messing with the RCTIME command and am getting extremely random numbers from it [noparse]:([/noparse]
  • VelocitVelocit Posts: 119
    edited 2008-12-12 06:30
    Study the RCTIME command in the SX/B help file. It includes example circuits that you can use...

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    -Paul
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