Since the BMP085 is a i2c sensor, its very easy to wire up. We'll be using an Arduino as an example but any microcontroller with i2c can be used. To start using with a solderless breadboard, we need to solder the header pins onto the breakout board.

We suggest plugging the header into a breadboard so the long pins are in the breadboard, and then laying the BMP085 breakout board on top. The photos show a v1 BMP085 sensor but this part is identical for both versions!

Then solder all of the pins!

That's it! Now we can wire the board up to the microcontroller.

Connect the VCC pin to a 3.3V power source. The V1 of the sensor breakout cannot be used with anything higher than 3.3V so don't use a 5V supply! V2 of the sensor board has a 3.3V regulator so you can connect it to either 3.3V or 5V if you do not have 3V available.

Connect GND to the ground pin.

Connect the i2c SCL clock pin to your i2c clock pin. On the classic Arduino Uno/Duemilanove/Diecimila/etc this is Analog pin #5

Connect the i2c SDA data pin to your i2c data pin. On the classic Arduino Uno/Duemilanove/Diecimila/etc this is Analog pin #4

Unfortunately, the i2c lines on most microcontrollers are fixed so you're going to have to stick with those pins.

You don't need to connect the XCLR (reset) or EOC (end-of-conversion) pins. If you need to speed up your conversion time, you can use the EOC as a indicator - in our code we just hang out and wait the maximum time possible.

This guide was first published on Jul 29, 2012. It was last updated on Jun 18, 2013.

This page (Wiring the BMP) was last updated on Jun 26, 2012.

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