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Barometric Pressure Sensor - BMP085

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)

Barometric Pressure Sensor - BMP085 Product Help and Resources

Core Skill: Soldering

This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.

3 Soldering

Skill Level: Competent - You will encounter surface mount components and basic SMD soldering techniques are required.
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Core Skill: Programming

If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.

3 Programming

Skill Level: Competent - The toolchain for programming is a bit more complex and will examples may not be explicitly provided for you. You will be required to have a fundamental knowledge of programming and be required to provide your own code. You may need to modify existing libraries or code to work with your specific hardware. Sensor and hardware interfaces will be SPI or I2C.
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Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

3 Electrical Prototyping

Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
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Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • 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: http://code.google.com/p/bmp085

    #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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