Retired Product

This product has been retired from our catalog and is no longer for sale. This page is made available for those looking for datasheets and the simply curious.

Creative Commons images are CC BY 2.0

Description: The BMP085 is a high-precision, ultra-low power digital barometer. It offers a measuring range of 300 to 1100 hPa with an absolute accuracy of down to 0.2 hPa. The BMP085 is based on piezo-resistive technology for EMC robustness, high accuracy and linearity as well as long term stability.

This sensor supports a voltage supply between 1.8 and 3.6VDC. It is designed to be connected directly to a micro-controller via the I²C bus

The BMP085 comes in an ultra-thin, 8-pin ceramic lead-less chip carrier (LCC) package.

A breakout board is available here!


  • Wide barometric pressure range
  • Digital two wire (I2C) interface
  • Flexible supply voltage range
  • Ultra-low power consumption
  • Low noise measurement
  • Fully calibrated
  • Temperature measurement included
  • Ultra-flat, small footprint


  • 5 x 5 mm (1.2 mm height)


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Customer Comments

  • For those trying to compare to other barometric pressure sensors, 1 hPa a 100 Pa. So the resolution is 3 Pa, and range 30 kPa to 110 kPa. The SCP1000 has a resolution of 2 Pa with range of 30 kPa to 110 kPa.

  • FYI: I put together a cpp library, please see:

    #include "bmp085.h"
    bmp085 BMP085;
    void setup()
    void loop()
        Serial.print(", ");
  • Description says “…absolute accuracy of down to 0.03 hPa” but I think you mean “RESOLUTION of 0.03 hPa” (or 3 Pa). The data sheet says the absolute accuracy ranges from +/- 1 to 4 hPa (100 to 400 Pa) depending on the pressure and temperature range.

  • Good sensor, but seems has a bug in I2C addressing implementation. When connected BMP085 and the other slave on the same I2C bus, while transferring data from master to other slave (with its own different address), with some byte sequences in data stream BMP085 turns SDA line low and master loses arbitration. At least such bug occurs when master is Atmel MPU I2C implementation.

  • Hi, can any body say me when I can get the source code AnsiC for this Sensor? or do you would pass me?
    Thanks in advances

  • Please send me an email when this is available on breakout. Thanks.

  • Been waiting for my backkordered sensors to get back in stock… I know.. impatience is not a virtue… but I wanna play :-)
    Looks they are in stock but my order is still backordered … odd… wassup with that ?

    • I got them right after I posted, and they are excellent, small, fast accurate and low power…nice product.

  • Will there be a breakout board for this part any time soon?

  • Nice to see this at Sparkfun, it’s an outstanding part. I use this sensor in an altimeter for model rockets and planes.
    I like the fact that you can choose how you want to trade off power consumption, update speed, and precision via a setting. In testing in my altitude chamber, it is wicked accurate!
    As for assembly, if you’re not baking tiny surface mount parts in a $40 toaster oven yet, you’re missing something fantastic. Fabulous results.

  • This is an awesome sensor, especiall for the price tag.
    I use them in my home sensor network.
    Here you can find an Arduino library and further information:

  • Great to see SF carrying this product. I can`t wait to try it. Looks hard to solder, any plans for a breakout board?

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