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How do I wire a BMP085 Barometric Pressure Sensor?

Discussion in 'Sensors and Actuators' started by Vagulus, May 15, 2018.

  1. Vagulus

    Vagulus

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    May 6, 2018
    I would like to include a BMP085 sensor in a weather station project build around an Arduino Pro Mini breakout. Sadly, the link from Core Electronics leads to a datasheet for the Chip itself, not the breakout. Can someone please tell me how to wire this little beastie into a Pro Mini?
    Thanks
     
  2. BobK

    BobK

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    Jan 5, 2010
    A breakout board typically just brings out the pins in a more hobbyist friendly form (like DIL). The datasheet should tell you all you need.

    Bob
     
  3. Bluejets

    Bluejets

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    First bit of the link says" i2c"
     
  4. davenn

    davenn Moderator

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    As @BobK said ... all the info is in the datasheet ... the chip pins are identified. There 7 out of the 8 pins are used (pin 5 in not connected)

    you can easily trace those IC pins to the header pin connector and problem of pin ID is solved

    as far as connecting to the Arduino Pro Mini goes, that isn't my field .... does the Arduino Pro Mini handle an I2C Bus ?


    Dave
     
  5. Vagulus

    Vagulus

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    May 6, 2018
    I am an extreme beginner in this sort of stuff so, Bluejets I do not appreciate the significance of i2c. What's that all about?

    I have to ask BobK and davenn whether we are reading the same thing (see attached file). I don't see anything that identifies 7 out of 8 pins. Maybe that's just me being an electronic dyslexic, but I don't see anything. Can you be a little more explicit?
    Thanks
     

    Attached Files:

  6. bushtech

    bushtech

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    Page 18 of your attached file gives the pinouts
     
    davenn likes this.
  7. Vagulus

    Vagulus

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    May 6, 2018
    Ooooh! Silly me. I'll have to learn to read further down the document. :oops:
    Thanks
     
  8. bushtech

    bushtech

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    Sep 13, 2016
    Getting into the habit of reading the Table of Contents (page 4) is usually a great start
     
  9. Vagulus

    Vagulus

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    May 6, 2018
    I looked up Wikipedia in i2c and it is way too sophisticated for me to grasp at this stage. However, I get the impression that the Auruino Pro Mini is not i2c-capable. It does not have pins designated SCL or SDA.
    Is that right?
     
  10. Vagulus

    Vagulus

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    May 6, 2018
    I figured out why I didn't get that far in the documentation. I had realized that the documentation was for the IC itself, not the breakout I was intending to use (BMP085 sensor) so the pinouts on page 18 weren't what I was looking for. :rolleyes:

    No harm done. I'm using a different breakout now - one I can get some documentation for. :)
     
  11. Bluejets

    Bluejets

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    You will quickly learn that in electronics there are no shortcuts if you want to educate yourself.

    Promini pinout attached.
    A4 .....SDA
    A5 ..... SCL
     

    Attached Files:

    hevans1944 likes this.
  12. Vagulus

    Vagulus

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    May 6, 2018
    That's true in other fields than electronics ;)
    [QUOTE="Bluejets, post: 1766426, member: 37203"
    Promini pinout attached.
    A4 .....SDA
    A5 ..... SCL[/QUOTE]
    Well ... I've seen a pile of Pro Mini diagrams but never seen that info.
    Thanks
     
  13. kellys_eye

    kellys_eye

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    Devices that use I2C and the Arduino usually have 'sketches' to accompany them - these are short programs that you can embed into your own application and modify to get the data you want.
     
  14. hevans1944

    hevans1944 Hop - AC8NS

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    Last edited: May 15, 2018
  15. Vagulus

    Vagulus

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    May 6, 2018
    Thanks hevans1944. That's a nice clear diagram. They're hard to find.
     
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