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Chaining Sensirion SHT7x sensors?

Discussion in 'Electronic Basics' started by Elias Aarnio, Apr 4, 2004.

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  1. Elias Aarnio

    Elias Aarnio Guest

    Hello,

    I am looking forward to do some humidity monitoring with Sensirion
    SHT75 sensors.

    Has anybody any experience on how to chain several of these to a
    single loop?

    Any pointers to (preferably Linux) software.

    I am aware of the Windows-software and schematics at
    http://peterpolm.tripod.com/sht11/id1.html
     
  2. You will probably have a problem. These units are address driven, but
    IIRC, the address is set at the factory, and they are all the same
    address. You need to have separate clock signals to each unit (or gate
    the clock to each unit) to address multiple units on the same bus.
     
  3. Elias Aarnio

    Elias Aarnio Guest

    Charlie,

    Thanks for your advice

    And the address is not user configurable, I guess... too bad. Well -
    there is always the low end solution - using same amount of buses as
    sensors.

    I wonder how the Sensirion people have designed their evaluation kit that
    seems to be able to handle up to 20 sensors? Separate interfacing
    circuitry for each sensor?
    http://www.sensirion.com/en/sensors/humidity/EK-H3.htm
     
  4. They probably have a micro with separate buses to each sensor. You can
    connect them all to the same data line, it is the clock that controls
    the chip. Uses a little non-standard format on the interface, as well. :-('
     
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