The BME680 sensor measures humidity, air pressure, temperature and air quality (IAQ). The BME280 ? is the little sister of the BME680 ? and does not measure air quality. The cost of the BME680 is about 20 Euro. The BME280 costs about 7 Euro.
The BME680 requires the I2C bus of the Raspberry Pis. The I2C bus is located at the Raspberry Pi on pins 3 and 5. Several sensors can be connected to the I2C bus. Each sensor type has its own address. The BME680 has the address 0x76. Since each address can only occur once, only sensors of different types or with different addresses can be connected.
Air quality (IAQ)
The air quality index is calculated from a measured gas value and the air humidity. Further information about Index Air Quality (IAQ) and how the air quality is calculated can be found here: BST-BME680-DS001-00
Response time (τ63%) 8s
Accuracy tolerance ± 3 % relative humidity
Hysteresis ≤ 1,5 % relative humidity
Pressure range 300 … 1100 hPa (equiv. to +9000…-500 m above/below sea level)
Relative accuracy ±0.12 hPa, equiv. to ±1 m (950 … 1050hPa @25°C)
Absolute accuracy typ. ±1 hPa (950 …1050 hPa, 0 …+40 °C)
Operating range Operational -40°C – +85°C
Full accuracy 0°C – +65°C
Air quality sensor
Response time (τ33-63%) 1sSource of the data sheet: https://www.watterott.com/de/BME680-Breakout
Indoor air quality (IAQ) index output
Translated 28.07.2019 by JK