While high pressure generally means clearer, sunnier weather. Low pressure typically means cloudier, rainier, snowier, and just generally uglier weather. You've probably heard weather reporters going on about low pressure systems and high pressure systems, that's because atmospheric pressure can be directly related to changes in weather. Here's at least a couple reasons to care about pressure. There are a lot of projects that can make use of barometric pressure data. Why do we care about barometric pressure? The BMP085 datasheet covers everything you'd ever need to know about that little sensor on your breakout board. If you're using an Arduino to talk to the BMP085, the Wire library will conveniently take care of most of the work in communicating with the sensor.Īs with most SparkFun products, before you start toying around with something, it's always best to the fancy datasheet. I 2 C is a synchronous two-wire interface, the first wire, SDA, transmits data, while a second wire, SCL, transmits a clock, which is used to keep track of the data. This means there may is a bit more overhead to get it talking to your microcontroller, but in return you get data that is much less susceptible to noise and other factors that may hamper an analog signal. The BMP085 has a digital interface, I 2 C to be specific. As a bonus the BMP085 also provides a temperature measurement, anywhere from 0 to 65 ° C. 'Pa' meaning the Pascal unit, which you'll probably more often see converted to hPa (hectoPascal), equal to 100 Pa, or kPa (kiloPascal), which is 1000 Pa. It features a measuring range of anywhere between 30,000 and 110,000 Pa. BMP085 Barometric Pressure Sensor Quickstartīosch's BMP085 is a rock-solid barometric pressure sensor.
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