We live on a planet with an atmosphere, a big ocean of gaseous air that keeps everything alive - and that atmosphere is constantly bouncing off of us, exerting air pressure on everything around us. But, how much air is in the atmosphere, bearing down on us
This absolute pressure sensor,ST LPS25HBcan quickly and easily measure this air pressure, useful when you want to know about the weather (are we in a low pressure or high pressure system) or to determine altitude, as the air thins out the higher we get above sea level. For example, at sea level, the official pressure level is1013.25 hPa.You can use this sensor to measure the current pressure where you are right now, to compare.
TheLPS25has a wide measurement range of260-1260 hPawith 24-bit pressure data measurements that can be read up to25 times a second (Hz), you can be confident that you always have an up to date and precise measurement. It#39;s pretty dang accurate too, with the ability to measurewithin 0.2 hPaafter calibration (plusmn; 1 hPa before calibration).
These days, helpful little sensors like the LPS25 are often quite little and tend to come in surface-mount packages that make them tricky to use with breadboards. With that in mind, we#39;ve taken the LPS25 and put it on a breakout board with level shifting circuitry and a voltage regulator. This means that not only can you use it with a breadboard, but you can use it with a wide range of devices that have either a3.3V logic level, like a Raspberry Pi or CircuitPython compatible Metro M4 Express,or with a 5V logic leveldevice like a Metro 328 or Arduino Uno.
Furthermore, we#39;ve includedSparkFun QwiiccompatibleSTEMMA QTconnectors for the I2C bus so you don#39;t even need to solder! All you need to do is plug in acompatible cable, wire it up to your device using one of our wiring diagrams and you#39;re ready to write some code to start reporting measurements.
To make the coding easier, we#39;ve writtenlibraries for ArduinoandCircuitPython or Pythonalong with accompanyingexample code, so all you have to do is gather your supplies and follow our instructions and you can know just how much air is sloshing around in your vicinity.