Barometric Pressure Sensor - BMP180

The BMP180 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 0.02 hPa. The BMP185 is based on piezo-resistive technology for EMC robustness, high accuracy and linearity as well as long term stability. What makes this sensor great is that it is nearly identical to its former rev, the BMP085!

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 BMP180 comes in an ultra-thin, 8-pin ceramic lead-less chip carrier (LCC) package.

  • 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

Barometric Pressure Sensor - BMP180 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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Customer Comments

  • More from the data sheet:

    The accuracy is -2/+0 hPa typical, -6/+4.5 hPa over -20C .. +65C temperature range.

    The resolution is gets down to 0.02 hPa. But resolution is not the same as accuracy.

  • Description talks about an 8-pin package, while the data sheet has it as 7. Thought I’d point that out.

  • Hi there! I’m looking for a water pressure sensor, so is this the right one? If not please suggest me. Thank you!

  • The BMP180 can trade off power and response time for accuracy via its different modes essentially by oversampling. And as @BradLevy said, accuracy is not the same as resolution. But for many applications you would be more interested in resolution and relative accuracy (ie, after self-calibration) than absolute accuracy. Altitude hold on a multicopter is one example.

    You can get close to 0.25m relative accuracy (noise) for altitude hold and low altitude altimeter applications with this device, though if you’re trying to use it as a barometer for absolute pressure its at least an order of magnitude less accurate.

    Also: you can’t use this for high altitude rocketry or near space balloon applications as it is only specified to 9000m ASL.

  • ok, some numbers from the datasheet - resolution: 0.06hPa (0.5m) in ultra low power mode 0.02hPa (0.17m) advanced resolution mode range: +9000m … - 500m relating to sea level

Customer Reviews

4 out of 5

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Super device!!

I found the BMP-180 very easy to interface to my new digital weather station which uses an ARM-7 microcontroller. Developing the firmware driver for the BMP-180 was very straight forward. The really big surprise was the absolute accuracy of the BMP180. My BMP180 produces readings which are almost identical to the USWS reported values!! It is a great buy. (I spent $45.00 on a Honeywell pressure sensor that not work nearly as well as the BMP180.)