Digital Temperature, Humidity, Barometric Pressur Sensor


    This project is one of many others I had made to control my house with rules, web interface, logger and many more. This project could take several measurements: Temperature/Humidity/Barometric pressure measurements.  All measurements are taken digitally and have their own dedicated A/D converter in each sensor.  It's a REAL digital environment sensor WITHOUT any calibration.
    The humidity and temperature are sense by a very good component made by Sensirion SHT75 and the impressive barometer is done my Intersema MS5534. Those two components talk their own language which is similar to other Serial synchronous protocol (or SPI).


  • Digital reading of temperature
  • Digital reading of humidity
  • Digital reading of barometric pressure
  • RS485 interface
  • Network firmware upgradeable



Schematic Temp/Hum/Baro sensor in PDF format

Source Code

4 Comments to “Digital Temperature, Humidity, Barometric Pressur Sensor”

  • louis vuitton June 22, 2010 at 6:47 pm

    Hello, I love your article. This is a good site and I wanted to post a little note to let you know, nice job! Thanks Katy

    Louis Vuitton


  • admin June 22, 2010 at 6:48 pm

    Thanks alot for this positive comment !!

  • Gernot May 19, 2014 at 12:22 pm

    What kind of update rate can you achieve?
    Thx, Gernot

  • admin May 19, 2014 at 1:24 pm

    easyly at each second

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Please note

All my source codes were taken from my personal projects.

Everything is for your information only. The C/C++ codes have been written
with ICCAVR. You can find the header and source CRT files by downloading their compiler.

All is for your information and everything is AS IS without any warranty of any kind. No other files are available and I don't make any modification for any body.



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