SEN0248

Gravity: I2C BME680 Environmental Sensor (VOC, Temperature, Humidity, Barometer) SKU: SEN0248 Introduction DFRobot BME680 Environmental Sensor is a low power gas, pressure, temperature & humidity sensor based on BOSCH BME680 sensor. It is a 4-in-1 multi-functional MEMS environmental sensor which integrates VOC (Volatile Organic Compounds) sensor, temperature sensor, humidity sensor and barometer. With DFRobot Gravity BME680 Environmental Sensor, you can monitor 4 environmental parameters simultaneously at the most. It is designed for air quality monitor, and due to the MEMS technology, BME680 has a small size and low power consumption. It can be widely used in environmental monitoring, home automation and control, Internet of Things (IoT) wearable device, GPS enhancement, etc. DFRobot Gravity BME680 environmental sensor provides a Gravity I2C connector, plug & play, easy to connect. With onboard voltage regulator IC and level translator IC, DFRobot Gravity BME680 environmental sensor shows good compatibility. It can be directly connected to 3.3V and 5V systems. Moreover, there is also a SPI connector in reserve for further expansion projects. With the development of industrialization, air pollution is getting worse and worse. Toxic chemical odors are even common with new furniture. These invisible killers are destroying your health day by day. You do need to concern about your health as soon as possible and DFRobot Gravity BME680 environmental sensor can help make an air quality monitor. DFRobot Gravity BME680, take care of your health! Specification • • • • • • • • • • • • Input Voltage: 3.3V~5.0V Operating Current: 5mA (25mA in VOC) Wire Connector: Gravity I2C Connector in Reserve: SPI Temperature Measurement Range: -40℃~+85℃ Temperature Measurement Precision: ±1.0℃(0~65℃) Humidity Measurement Range: 0-100%r.H Humidity Measurement Precision: ±3%r.H.(20-80% r.H.,25℃) Atmospheric Pressure Measurement Range: 300-1100hPa Atmospheric Pressure Measurement Precision: ±0.6hPa(300-1100hPa,0~65℃) IAQ (Indoor Air Quality) Range: 0-500 (the larger the worse) Module Size: 30 × 22(mm) / 1.18 x0.87(inches) IAQ (Indoor Air Quality) Sheet Board Overview Num Label Description + VCC Power Input(3.3~5.0V) - GND Power Ground(0V) C SCL I2C Clock Signal D SDA I2C Data Signal Tutorial This tutorial will demonstrate how to use this sensor. At present, only FireBeetle ESP8266 IOT Microcontroller can read IAQ, other controllers can not support. Requirements • Hardware DFRduino UNO R3 (or similar) x 1 DFRobot Gravity BME680 environmental sensor x1 Gravity 4Pin Sensor wire (or Dupont wires) x1 • Software Arduino IDE (V1.0.x or V1.8.x), Click to Download Arduino IDE from Arduino® Download and install the BME680 Library. How to install the library? Connection Diagram • • This product supports both IIC and SPI wiring connector. Please select suitable connector according to the wiring. Below is the connection diagram for your reference. IIC wiring connector is recommended, plug & play, easy to use. IIC Connection Diagram You must pay attention to the wiring order, VCC to Power Supply, GND to Gr ound. IIC Connection Diagram SPI Connection Diagram You must pay attention to the wiring order, VCC to Power Supply, GND to Gr ound. SPI Connection Diagram Sample Code Download and install the BME680 Library. How to install Libraries in Arduino IDE This sample code is based on IIC connector. Please check file: DFRobot_BME680_SPI.ino for sample code for SPI connector in the library file. Because SPI sample code realizes the same function, it will not be shown at here. Calibration is needed to monitor altitude value exactly. So that please fill in the sample code with correct local altitude value: seaLevel = bme.readSeaLevel (your correct local altitude value) Without IAQ Program Function: read data from BME680 sensor and serial printing(without IAQ). #include "DFRobot_BME680_I2C.h" #include "Wire.h" #include "SPI.h" /*use an accurate altitude to calibrate sea level air pressure*/ #define CALIBRATE_PRESSURE DFRobot_BME680_I2C bme(0x77); //0x77 I2C address float seaLevel; void setup() { Serial.begin(115200); while(!Serial); delay(1000); Serial.println(); Serial.print(bme.begin()); #ifdef CALIBRATE_PRESSURE bme.startConvert(); delay(1000); bme.update(); /*You can use an accurate altitude to calibrate sea level air pressure. *And then use this calibrated sea level pressure as a reference to obta in the calibrated altitude. *In this case,525.0m is chendu accurate altitude. */ seaLevel = bme.readSeaLevel(525.0); Serial.print("seaLevel :"); Serial.println(seaLevel); #endif } void loop() { bme.startConvert(); delay(1000); bme.update(); Serial.println(); Serial.print("temperature(C) :"); Serial.println(bme.readTemperature(), 2); Serial.print("pressure(Pa) :"); Serial.println(bme.readPressure()); Serial.print("humidity(%rh) :"); Serial.println(bme.readHumidity(), 2); Serial.print("gas resistance(ohm) :"); Serial.println(bme.readGasResistance()); Serial.print("altitude(m) :"); Serial.println(bme.readAltitude()); #ifdef CALIBRATE_PRESSURE Serial.print("calibrated altitude(m) :"); Serial.println(bme.readCalibratedAltitude(seaLevel)); #endif } With IAQ Program Function: read data from BME680 sensor and serial printing(with IAQ). At present, only FireBeetle ESP8266 IOT Microcontroller can read IAQ, other controllers can not support. For FireBeetle ESP8266 IOT Microcontroller,please use Arduino IDE 1.8.x. Then update the SDK to 2.3.1 or above. Refer to section 4.2 of the FireBeetle ESP8266 Wiki for the tutorial. #include "DFRobot_BME680_I2C.h" #include "Wire.h" /*use an accurate altitude to calibrate sea level air pressure*/ #define CALIBRATE_PRESSURE DFRobot_BME680_I2C bme(0x77); float seaLevel; //0x77 I2C address void setup() { uint8_t rslt = 1; Serial.begin(115200); while(!Serial); delay(1000); Serial.println(); while(rslt != 0) { rslt = bme.begin(); if(rslt != 0) { Serial.println("bme begin faild"); delay(2000); } } Serial.println("bme begin successful"); bme.supportIAQ(); } void loop() { static uint8_t firstCalibrate = 0; #ifdef CALIBRATE_PRESSURE if(firstCalibrate == 0) { if(bme.iaqUpdate() == 0) { /*You can use an accurate altitude to calibrate sea level air pressu re. *And then use this calibrated sea level pressure as a reference to obtain the calibrated altitude. *In this case,525.0m is chendu accurate altitude. */ seaLevel = bme.readSeaLevel(525.0); Serial.print("seaLevel :"); Serial.println(seaLevel); firstCalibrate = 1; } } #else firstCalibrate = 1; #endif if(firstCalibrate) { uint8_t rslt = bme.iaqUpdate(); if(rslt == 0) { Serial.println(); Serial.print("time(ms) :"); Serial.println(millis()); Serial.print("temperature(C) :"); Serial.println(bme.readTemperature(), 2); Serial.print("pressure(Pa) :"); Serial.println(bme.readPressure()); Serial.print("humidity(%rh) :"); Serial.println(bme.readHumidity(), 2); Serial.print("altitude(m) :"); Serial.println(bme.readAltitude()); #ifdef CALIBRATE_PRESSURE Serial.print("calibrated altitude(m) :"); Serial.println(bme.readCalibratedAltitude(seaLevel)); #endif Serial.print("gas resistance :"); Serial.println(bme.readGasResistance()); if(bme.isIAQReady()) { Serial.print("IAQ :"); float iaq = bme.readIAQ(); Serial.print(iaq); if(iaq < 50) Serial.println(" good"); else if(iaq < 100) Serial.println(" average"); else if(iaq < 150) Serial.println(" little bad"); else if(iaq < 200) Serial.println(" bad"); else if(iaq < 300) Serial.println(" worse"); else Serial.println(" very bad"); } else Serial.println("IAQ not ready, please wait about 5 minutes"); } } } Expected Results Without IAQ With IAQ Arduino Library Functions List • Create a bme object and write to IIC address. DFRobot_BME680_I2C bme(0x77); • Initialize BME680 and library begin(); • Start data converting startConvert(); • Read converted data update(); • support reading the IAQ supportIAQ(); • Start data converting with IAQ iaqUpdate(); • Query whether the IAQ conversion is complete. If Completed return 1, else return 0. isIAQReady(); • Get temperature data, unit of ℃, precision of 0.01℃ readTemperature(); • Get atmosphere pressure, unit of pa, precision of 0.01pa readPressure(); • Get humidity, unit of %rh, precision of 0.01%rh readHumidity(); • Get resistance value of gas-resistance, unit of ohm, precision of 0.01ohm readGasResistance(); • Get altitude, unit of m, precision of 0.01m readAltitude(); • Get sea level atmosphere pressure reference value and send altitude data readSeaLevel(float altitude); • Get calibrated altitude value and send atmosphere pressure reference value readCalibratedAltitude(float seaLevel); Compatibility Test MCU Pass Fail Untested Note FireBeetle-Board328P √ Do Not Support IAQ FireBeetle-ESP32 √ Do Not Support IAQ FireBeetle-ESP8266 √ Support IAQ Leonardo √ Do Not Support IAQ FAQ For any questions, advice or cool ideas to share, please visit the DFRobot Forum. More Documents • • • • Schematic Layout BME680 Datasheet 74HC125PW Datasheet https://www.dfrobot.com/wiki/index.php/Gravity:_I2C_BME680_Environmental_Sensor_(VOC,_Temperature,_Humidity,_Barometer)_SKU:_SEN0248 3-6-18