The BME680 precision sensor from Bosch SensorTec can measure humidity with ±3% accuracy, barometric pressure with ±1 hPa absolute accuracy, and temperature with ±1.0°C accuracy. Because pressure changes with altitude, and the pressure measurements are so good, you can also use it as an altimeter with ±1 meter or better accuracy! The BME680 takes those sensors to the next step in that it contains a small MOX sensor. The heated metal oxide changes resistance based on the volatile organic compounds (VOC) in the air, so it can be used to detect gasses & alcohols such as Ethanol, Alcohol and Carbon Monoxide, and perform air quality measurements. Note it will give you one resistance value, with overall VOC content, but it cannot differentiate gasses or alcohols. Based on herrmannj's algorithm IAQ in PPM-Units could be delivered without using proprietary BSEC static libs.
#CO2 Concentration Levels:
| effect | ppm-value |
|---|---|
| good | < 350 ppm |
| acceptable | < 450 ppm |
| complaint of stuffiness and odors | < 700 ppm |
| general drowsiness | < 1000 ppm |
| adverse health effects expected | < 2500 ppm |
| serious oxigen deprivation | < 5000 ppm |
#Exposed JS_BME680-Methods:
void do_begin();
void do_bme680_measurement();
unsigned long get_bme680Interval();
void set_bme680_device_address(uint8_t addr) ;
void set_bme680_offset_temp(float toffset);
void set_bme680_offset_hum(float hoffset);
bool isIAQValid();
float getTemp(void);
float getPress(void);
float getHum(void);
float getAlt(void);
float getCalibAlt();
float getGasRes(void);
float getSeaLevel();
float getTVoc(void);
Credits and very thanks to Jörg Herrmann @ https://github.com/herrmannj/ and https://forum.fhem.de/index.php/topic,96241.0.html Author: js @ github.com/juergs and https://forum.fhem.de/index.php/topic,78619.0.html
Wiring Sample:
Designed specifically to work with the Adafruit BME680 Breakout * http://www.adafruit.com/products/3660 and libraries.
These sensors use I2C to communicate, up to 4 pins are required to interface
Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
Check out the links above for our tutorials and wiring diagrams
On-line documention for the APIs is available, too:
Requires installation of the Adafruit Unified Sensor library:
Written by Limor Fried/Ladyada for Adafruit Industries. BSD license, all text above must be included in any redistribution
Enabled: I2C for Wemos D1 mini SDA:D2 / SCL:D1
Scanning I2C...
I2C<*** Started!
Enabled: I2C for Wemos D1 mini SDA:D2 / SCL:D1
Scanning I2C...
I2C device found at address 0x77 !
done
I2C: ok BME680 sensor found! :-)
[10.37] Temperature = 27.32 *C Pressure = 999.40 hPa Humidity = 51.94 % Gas = 0.00 KOhms Approx. Altitude = 115.79 m
[20.37] Temperature = 27.41 *C Pressure = 999.38 hPa Humidity = 51.92 % Gas = 87.76 KOhms Approx. Altitude = 115.79 m
[30.37] Temperature = 27.53 *C Pressure = 999.40 hPa Humidity = 51.85 % Gas = 95.60 KOhms Approx. Altitude = 116.12 m
[40.37] Temperature = 27.59 *C Pressure = 999.40 hPa Humidity = 51.88 % Gas = 100.18 KOhms Approx. Altitude = 115.95 m
[50.37] Temperature = 27.63 *C Pressure = 999.40 hPa Humidity = 51.94 % Gas = 102.70 KOhms Approx. Altitude = 115.79 m
[60.37] Temperature = 27.64 *C Pressure = 999.40 hPa Humidity = 51.99 % Gas = 104.36 KOhms Approx. Altitude = 115.95 m
[70.37] Temperature = 27.65 *C Pressure = 999.38 hPa Humidity = 51.99 % Gas = 105.15 KOhms Approx. Altitude = 115.95 m
[80.38] Temperature = 27.66 *C Pressure = 999.38 hPa Humidity = 52.02 % Gas = 106.08 KOhms Approx. Altitude = 115.95 m
[90.38] Temperature = 27.66 *C Pressure = 999.38 hPa Humidity = 52.02 % Gas = 106.21 KOhms Approx. Altitude = 115.95 m
[100.38] Temperature = 27.66 *C Pressure = 999.40 hPa Humidity = 51.98 % Gas = 107.30 KOhms Approx. Altitude = 116.12 m
[110.38] Temperature = 27.66 *C Pressure = 999.38 hPa Humidity = 51.93 % Gas = 108.13 KOhms Approx. Altitude = 116.12 m
[120.38] Temperature = 27.67 *C Pressure = 999.36 hPa Humidity = 51.83 % Gas = 108.48 KOhms Approx. Altitude = 116.29 m
[130.38] Temperature = 27.68 *C Pressure = 999.36 hPa Humidity = 51.78 % Gas = 108.41 KOhms Approx. Altitude = 116.12 m
[140.38] Temperature = 27.68 *C Pressure = 999.36 hPa Humidity = 51.83 % Gas = 108.84 KOhms Approx. Altitude = 116.12 m
[150.38] Temperature = 27.68 *C Pressure = 999.38 hPa Humidity = 51.89 % Gas = 108.62 KOhms Approx. Altitude = 116.29 m
[160.38] Temperature = 27.69 *C Pressure = 999.36 hPa Humidity = 51.86 % Gas = 108.70 KOhms Approx. Altitude = 116.46 m
[170.38] Temperature = 27.69 *C Pressure = 999.34 hPa Humidity = 51.84 % Gas = 109.48 KOhms Approx. Altitude = 116.46 m
[180.39] Temperature = 27.70 *C Pressure = 999.36 hPa Humidity = 51.83 % Gas = 109.26 KOhms Approx. Altitude = 116.12 m
[190.39] Temperature = 27.69 *C Pressure = 999.36 hPa Humidity = 51.85 % Gas = 109.41 KOhms Approx. Altitude = 116.29 m
[200.39] Temperature = 27.69 *C Pressure = 999.36 hPa Humidity = 51.83 % Gas = 109.33 KOhms Approx. Altitude = 116.29 m
[210.39] Temperature = 27.68 *C Pressure = 999.36 hPa Humidity = 51.83 % Gas = 109.48 KOhms Approx. Altitude = 116.29 m
[220.39] Temperature = 27.68 *C Pressure = 999.32 hPa Humidity = 51.84 % Gas = 110.05 KOhms Approx. Altitude = 116.46 m
[230.39] Temperature = 27.68 *C Pressure = 999.32 hPa Humidity = 51.82 % Gas = 110.34 KOhms Approx. Altitude = 116.29 m
[240.39] Temperature = 27.68 *C Pressure = 999.32 hPa Humidity = 51.80 % Gas = 111.00 KOhms Approx. Altitude = 116.29 m
[250.39] Temperature = 27.68 *C Pressure = 999.32 hPa Humidity = 51.78 % Gas = 110.93 KOhms Approx. Altitude = 116.12 m
[260.39] Temperature = 27.68 *C Pressure = 999.34 hPa Humidity = 51.81 % Gas = 110.93 KOhms Approx. Altitude = 116.29 m
[270.39] Temperature = 27.68 *C Pressure = 999.32 hPa Humidity = 51.80 % Gas = 110.63 KOhms Approx. Altitude = 116.46 m
[280.40] Temperature = 27.68 *C Pressure = 999.34 hPa Humidity = 51.75 % Gas = 111.52 KOhms Approx. Altitude = 116.46 m
[290.40] Temperature = 27.68 *C Pressure = 999.34 hPa Humidity = 51.80 % Gas = 110.78 KOhms Approx. Altitude = 116.46 m
[300.40] Temperature = 27.69 *C Pressure = 999.34 hPa Humidity = 51.77 % Gas = 111.37 KOhms Approx. Altitude = 116.63 m
[300.77] Taupunkt: 17.00 tVOC: 125
BME680-Reading done.
[310.40] Temperature = 27.69 *C Pressure = 999.32 hPa Humidity = 51.78 % Gas = 111.37 KOhms Approx. Altitude = 116.46 m
[310.77] Taupunkt: 17.01 tVOC: 125
BME680-Reading done.
[320.40] Temperature = 27.70 *C Pressure = 999.30 hPa Humidity = 51.76 % Gas = 111.96 KOhms Approx. Altitude = 116.63 m
[320.77] Taupunkt: 17.00 tVOC: 125
BME680-Reading done.
[330.40] Temperature = 27.70 *C Pressure = 999.30 hPa Humidity = 51.78 % Gas = 111.07 KOhms Approx. Altitude = 116.46 m
[330.77] Taupunkt: 17.00 tVOC: 125
BME680-Reading done.
[340.40] Temperature = 27.70 *C Pressure = 999.34 hPa Humidity = 51.77 % Gas = 111.82 KOhms Approx. Altitude = 116.46 m
[340.77] Taupunkt: 17.00 tVOC: 125
BME680-Reading done.
[350.40] Temperature = 27.70 *C Pressure = 999.34 hPa Humidity = 51.79 % Gas = 111.44 KOhms Approx. Altitude = 116.46 m
[350.78] Taupunkt: 17.02 tVOC: 126
BME680-Reading done.