Temperature recorder project?

Discussion in 'Embedded Systems and Microcontrollers' started by spinnaker, Nov 24, 2009.

  1. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
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    We have a problem at work where the office becomes pretty cold throughout the day.

    The HVAC guy shows up and of course he measures normal temperatures.


    I took in my new handy dandy multimeter that has a thermometer and I observed that the temperature varies a great deal throughout the day. As much as 5F.

    Perhaps it is a bit much to chew for a first project but I thought it might be interesting to build a temperature recorder.

    I know I will need a thermocouple. But what would be a good PIC to use? I will need to access this data in some way. It would need a time stamp.

    Can someone push me in the right direction?
     
    Last edited: Nov 24, 2009
  2. russ_hensel

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    Jan 11, 2009
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  3. n9352527

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    Oct 14, 2005
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    Maybe use temperature sensor IC, such as the LM series from NSC. It is simpler than using thermocouple.
     
  4. spinnaker

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    Oct 29, 2009
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    Did some searching. These are very cool.

    Would you suggest the analog or digital variety? Digital seems easier to implement but more expensive than the analog.

    I found this one here

    http://www.sparkfun.com/commerce/product_info.php?products_id=245

    Maybe a few more bells and whistles than what I need. But Dallas Semi Conductor provides a really easy to follow application notes.

    I did not see that in the LM Series datasheet.
     
  5. n9352527

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    Yes, those are really nice parts. I've never used the one wire Dallas products. They are too expensive. Maybe for one off casual design price is not really a problem. If your micro has an ADC and the resolution is enough for your need, then the analogue type is cheaper. But if not, then find a digital one, with appropriate resolution.
     
  6. russ_hensel

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    the lm35 is analog and probably easier to interface.
     
  7. Arm_n_Legs

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    Mar 7, 2007
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    The Silicon Labs C8051F310 (and some other of their variants) has a built in temperature sensor in the microcontroller. The chip is just a few dollars, but you would need to get their USB-JTAG adaptor (about US$30) to start off the development with the Keil 8051 C (eval copy).
     
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