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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-NC-SA 3.0

Description: Replacement: None. We are no longer carrying this barometric pressure sensor retail kit in our catalog. This page is for reference only.

This is a simple breakout board for the BMP085 high-precision, low-power digital barometer in retail packaging. The BMP085 offers a measuring range of 300 to 1100 hPa with an accuracy down to 0.03 hPa in ultra-high resolution mode (that’s 0.25m of altitude at sea level!) It’s based on piezo-resistive technology for high accuracy, ruggedness and long term stability. These come factory-calibrated, with the calibration coefficients already stored in ROM. Writing your own code for it requires some math, but there are plenty of examples and libraries available (see below).

This breadboard-friendly board breaks out every pin to a 6-pin 0.1" pitch header. VCC can be from 1.8V to 3.6V; we typically run it on a clean, regulated 3.3V supply. The analog and digital supplies (VDDD and VDDA) are tied to a single header pin, but are separately decoupled. It connects to a microcontroller via I²C bus (also known as TWI, or on the Arduino, the “Wire” library).

We’ve made some minor hardware changes this time around to address some suggestions from the comment section including the addition of a solder jumper to disable the I2C pull-ups.

Features:

  • Digital two wire (I²C, TWI, “Wire”) interface
  • Wide barometric pressure range
  • Flexible supply voltage range (1.8V to 3.6V)
  • Ultra-low power consumption
  • Low noise measurements
  • Factory-calibrated
  • Includes temperature sensor
  • Low-profile with a small footprint

Dimensions:

  • 0.6" x 0.6" (15.24 x 15.24 mm)

Documents:

Replaces:RTL-09889

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Customer Comments

  • Two questions,

    1. Assuming I have everything properly connected to this device, would I be able to detect a difference in reading if I raised it 3ft? for example. I’m not looking for absolute accuracy, I’m looking to use this to measure rate of change in altitude.

    2. Will you guys start supplying the BMP 180 soon?

    • The last time I had one on my desktop, the noise was on the order of 3 feet and you could definitely see the difference when it was moved from floor to desk to ceiling, so with some averaging it could likely do what you want (but not a whole lot more). (Interestingly it also clearly showed when the HVAC switched on and off, “pressurizing” the building envelope. These things are sensitive.)

      And yes, since the BMP085 is being retired, we’ll have a BMP180 product out this fall. They’re software-compatible so in most cases you shouldn’t have any problems switching from one to the other.

  • There is code on OBEX for using this sensor with the Propeller Processor.

  • How do you guys always end up adding products a few hours after the new product post? :)

    • It happens when we run out of the old revision and transition to the new one. It happens as people make purchases and is not something we can ‘plan’ out.

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