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Thread: temperature sensors

  1. #11
    Newbie CNDaccent's Avatar
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    Thumbs up single line multiple temp sensors

    IMHO: I2C single line temp sensors are the way to go. I've worked on different projects (I'm an EET) and these are pretty simmple to use. Each sensor gets programmed with an address so they can all use the same data I\O line. 3-pins 3-wires and you can connect a bunch.
    Dallas semi makes a decent one (DS18B20) with a 64-bit ID code, in case you need that many
    look at all the magic smoke...

    Small Amp, Big Car
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  2. #12
    Variable Bitrate
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    Quote Originally Posted by CNDaccent
    IMHO: I2C single line temp sensors are the way to go. I've worked on different projects (I'm an EET) and these are pretty simmple to use. Each sensor gets programmed with an address so they can all use the same data I\O line. 3-pins 3-wires and you can connect a bunch.
    Dallas semi makes a decent one (DS18B20) with a 64-bit ID code, in case you need that many
    Any help on interfacing them (ds18B20's and ds1822P's) to a parellel port, game port, or serial port? Parellel would be prefered by me as what else am I going to use that port for (a printer...NO!). Second would be game port then serial (I already used my two up). I do have a usb to serial adapter but I'm trying not to use it because if I do then I'm going to need to buy a usb hub

  3. #13
    Maximum Bitrate DeltaFX's Avatar
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    There 's a solution with a 1-wire-USB interface too. And 1-wire can be used for other sensors than temp. But it's in French

    http://deltafx.free.fr/f02a016.pdf

  4. #14
    Maximum Bitrate starfox's Avatar
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    Also this one that uses an AT90S2313 and talks to an ADC and temp sensor via Microwire.

    http://mcselec.com/an_104.htm

    I'm gonna try build it and write a serial port interface for it in the next few weeks..

  5. #15
    Raw Wave rando's Avatar
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    Quote Originally Posted by momanz
    This looks like the way to go. You basicaly get as many sensors as you want and it uses the SMbus (I2C) connector on the epia boards. One IC and you have 4 remote temp sensors 2 ICs 8 etc and the actual temperature sensor is a simple el-cheapo transistor. Best of all you don't use up a serial port.
    As long as they are strictly SMBus you should be all set with the onboard SMBus (not I2C) connector on the EPIA boards. There doesn't appear to be a way to issue I2C commands on it.

  6. #16
    Raw Wave rando's Avatar
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    Quote Originally Posted by hcker2000
    Any help on interfacing them (ds18B20's and ds1822P's) to a parellel port, game port, or serial port? Parellel would be prefered by me as what else am I going to use that port for (a printer...NO!). Second would be game port then serial (I already used my two up). I do have a usb to serial adapter but I'm trying not to use it because if I do then I'm going to need to buy a usb hub
    It's fairly trivial to bitbang I2C (or the SMBus subset) over the parallel port. The Linux lmsensors package is a good starting point. I have some VB.NET code I wrote to do it for Seth's radio project.

  7. #17
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  8. #18
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    Every time I hear a parallel port project always make me cringe I dont know why

    Here what Ill do if I where you for a quick dirty cheap solution.

    1) Get an old USB analog joystick.
    2) Open it and remove the potentiometer that control the XY movements
    3) Add a thermistor (a resistor that changes resistance with temperature)
    4) Add a resistor with the thermistor

    The thermistor and the resistor act like the potentionmeter that control the XY movement except that it is now controlled by the temperature. Just read off the ADC output from the joystick port which now represent the temperature wherever you place that thermistor.


    http://www.maplin.co.uk/search.aspx?...=5m2&worldid=3

    Just make sure that the total value of the resistor and the thermistor equals to the original value of the removed potentiometer.

    You now have 4 temperature sensors + 4 buttons (whatever you may wanna use it for)

    Done

  9. #19
    Variable Bitrate
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    The point was to make some thing that didn't cost an arm and a leg. The joystick idea is kind of interesting but the ds1820's just seem like they would do a better job.

  10. #20
    Constant Bitrate
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    Here it is! Works like a charm. Hooked the thing up to the 6 pin I2C connector (only 4 pins used) and now I have 5 extra temp sensors 1 on chip and 4 remote. The big green board in the picture is a qsop16 to dip16 adapter. I didn't want to go through the hassel of trying to solder the tiny pins on the chip so I splurged and spent the money on the adapter.
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