BME680 Environmental Sensor — Temperature, Humidity, Pressure + VOC Gas (STEMMA QT)

The Bosch BME680 packs four sensors into one compact breakout: temperature, humidity, barometric pressure, and a VOC (gas) MOX sensor. Connect over I2C or SPI, and use the built-in STEMMA QT / Qwiic ports for quick, solderless wiring.

Why you’ll like it

What you can build

• Indoor environment monitor (room comfort + air quality trend indicator)
• Weather station (temperature/humidity/pressure logging)
• Altitude / pressure-change detector (simple altimeter experiments)
• Smart home automation triggers (e.g., fan control based on VOC trend)

Technical specifications

Pinout & power notes

• I2C: use SDA/SCL + power and ground (fastest setup with STEMMA QT)
• SPI: use SCK/MOSI/MISO/CS when you prefer SPI wiring
• Power: breakout is designed to work with 3.3V or 5V microcontrollers
• Best practice: allow warm-up time for stable VOC trend readings

What’s in the box

• 1× BME680 Temperature / Humidity / Pressure / Gas Sensor Breakout (STEMMA QT)

FAQ

• Does it measure “true VOC ppm”?
  The BME680 provides a gas/VOC resistance signal that’s great for trends and comparisons. For precise absolute measurements, calibration is needed.
• Can it tell what gas is present?
  No—this sensor reports an overall VOC/gas response and can’t differentiate specific gases.
• Is it Arduino / ESP32 / Raspberry Pi compatible?
  Yes—use I2C or SPI, and STEMMA QT makes wiring easy. Works well with Arduino and CircuitPython libraries.
• Do I need to “burn in” the sensor?
  For best VOC stability, it’s commonly recommended to run it for an extended initial period and warm it up before readings.