BME680 Digital Humidity Temperature Pressure High Altitude Sensor Module
Overview
The BME680 is a powerful 4-in-1 environmental sensor developed by Bosch Sensortec.
It can measure:
Temperature
Humidity
Atmospheric Pressure
Air Quality (VOC gases)
Also used as a high-altitude sensor due to accurate pressure measurement.
Working Principle
The module integrates multiple sensing technologies:
Temperature Semiconductor sensor
Humidity Capacitive sensing
Pressure MEMS barometric sensor
Gas Heated metal-oxide sensor (detects VOCs)
It estimates Indoor Air Quality (IAQ) BME680 SENSOR MODULE Temp: -40C to 85C Humidity: 0100% RH Pressure: 3001100 hPa Gas: VOC detection Voltage: 3.3V5V Interface: I2C / SPI
Temperature Range: -40C to +85C
Humidity Range: 0100% RH (3%)
Pressure Range: 3001100 hPa
Altitude Accuracy: ~1 meter (derived from pressure)
IAQ Index: 0500 (air quality level)
Interface: I2C / SPI
Key Features
4-in-1 environmental sensing
High accuracy and resolution
Low power consumption
Digital output (easy integration)
Supports air quality estimation (VOC detection)
Compact MEMS design
Applications
Air quality monitoring systems
ones & altitude measurement
IoT environmental sensing
How Altitude Measurement Works
Pressure decreases as altitude increases
Sensor measures pressure calculates height
Used in:
Altimeters
Drones
GPS enhancement systems
Important Notes
Gas sensor needs burn-in time (few hours to days) for accuracy
IAQ values are relative, not absolute pollution levels
Sensitive to temperature changes (self-heating effect)
Requires libraries (like BSEC) for best air quality data
From real-world usage (Reddit insight):
Sensor may need caes BME280 Temp + Humidity + Pressure BMP280 Pressure only BME680 Temp + Humidity + Pressure + Gas (best choice)
Pro Tip
For advanced projects:
Use ESP32 + BME680
Add WiFi dashboard (IoT)
Build your own smart air quality monitoring sys