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Arduino library for using the Bosch BME280 sensor which senses temperature, humidity and pressure. Since the package is quite small and difficult to breadboard with, the Adafruit BME280 Breakout board was used for development.
A complete description of the BME280 sensor can be found in the BME280 Datasheet while the Adafruit BME280 tutorial describes additional board information.
The BME280 allows the user to individually adjust the sampling rates for each component sensing (temperature, humidity and pressure) as well as to set the inter-measurement delay time and the IIR filter sampling coeffient. Combining these settings allows very fine-grained control of measurement times vs. measurement accuracy.
The BME280 measures temperatures between -40°C and 85°C with a full accuracy range between 0°C and +65°C. The accuracy is ±0.5°c with a full resolution of 0.01°C. Since the temperature sensor in the small package is tied to the PCB board on which it is soldered placed and has some self-heating as well the temperature reading will usually be above ambient.
Non-condensing humidity between 0% and 100% is measured with an accuracy of ±3% at a maximum resolution of 0.008%.
The pressure sensor works in temperatures between -40°C and +85°C although the zone of full accuracy only goes from 0°C to +65°C. Pressure is measured between 300hPa and 1100hPa with an accuracy of ±1.0 hPa and a resolution of 0.2Pa
