BME680 4-in-1 environmental sensor module — temperature, humidity, pressure, VOC gas

The BME680 is a highly integrated environmental sensor from Bosch Sensortec that measures four parameters in a single compact package: temperature, relative humidity, barometric pressure, and VOC (volatile organic compound) gas resistance. The gas sensor enables indoor air quality (IAQ) assessment by detecting a broad range of gases including ethanol, acetone, and carbon monoxide. It communicates via I²C or SPI and is compatible with Arduino, ESP32, Raspberry Pi, and virtually any modern microcontroller.Key Specifications: Sensor IC: Bosch BME680 Measurements: Temperature, Humidity, Pressure, Gas (VOC resistance) Interface: I²C (address 0x76 or 0x77) and SPI (up to 10 MHz) Supply voltage: 1.71V – 3.6V (module typically 3.3V – 5V with onboard regulator) Temperature: range −40°C to +85°C, accuracy ±1.0°C Humidity: range 0–100% RH, accuracy ±3% RH Pressure: range 300– 1100 hPa, accuracy ±1 hPa Gas sensor: VOC resistance output (kΩ), broad-spectrum detection Current consumption: 2.1μA at 1Hz (humidity + temperature), ~0.1mA during gas measurement Gas heater: integrated, programmable temperature (200°C – 400°C) Package: LGA-8 (3.0mm × 3.0mm × 0.93mm) Operating temperature: −40°C to +85°C I²C Pinout (typical module): VCC: 3.3V – 5V power input GND: Ground SDA: I²C data SCL: I²C clock SDO: I²C address select (GND = 0x76, VCC = 0x77) / SPI MISO CS: SPI chip select (pull high for I²C mode) Compatible Libraries: Adafruit BME680 Arduino library BSEC (Bosch Sensortec Environmental Cluster) library for IAQ index Pimoroni BME680 Python library (Raspberry Pi) ESP-IDF BME680 component Applications: Indoor air quality (IAQ) monitoring and scoring Smart home environmental dashboards Weather stations and barometric loggers HVAC and ventilation control systems Wearable environmental monitors IoT edge nodes for environmental sensing Note: The gas sensor requires a burn-in period of approximately 30 minutes on first use, and a run-in period of 5 minutes before each measurement for accurate VOC readings. Use Bosch’s BSEC library for a calibrated IAQ index (0–500 scale) rather than raw gas resistance values.