BMP085 is a digital pressure sensor. Its absolute accuracy can reach 0.03hPa and power consumption is extremely low with current of only 1µA when operating in standard mode. BMP085 adopts ultra-thin 8-pin ceramic leadless chip carrier (LCC) package, which can be connected directly with a variety of microprocessors through 12C bus.

In addition to applications in meteorology, pressure sensor is basically used to test altitude. For example, to accurately determine whether someone is going upstairs or downstairs, the horizontal height changes can be indirectly figured out by calculating the air pressure variations between the upstairs and downstairs.