This standalone environmental sensor BME688 is a high-performance 4-in-1 gas sensor with Artificial Intelligence (AI), integrated high-linearity and high-accuracy pressure, humidity, and temperature sensors. It can measure humidity with ±3% accuracy, barometric pressure with ±1 hPa absolute accuracy, and temperature with ±1.0°C accuracy, because the 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!
Compared to BME680, it carries an extra gas scanning function with low power consumption (3.9 mA in standard gas scan mode). It can detect a wide variety of volatile organic compounds (VOCs), volatile sulfur compounds (VSCs), and other gases such as carbon monoxide and hydrogen in the part per billion (ppb) range. In standard configuration, the presence of VSCs is detected as an indicator for e.g. bacteria growth. The gas scanner can be customized with respect to sensitivity, selectivity, data rate, and power consumption as well. It is trainable to detect different gas mixtures and their presence (e.g. coffee) with Bosch's AI Studio like in home appliances, IoT products, or Smart homes.
This new BME688 is ideal for innovative custom applications such as detecting food spoilage or timely detection of wildfires by measuring current gases and tracking changes in temperature and humidity. The artificial intelligence capabilities of the sensors and Bosch Sensortec's new BME AI-Studio software tool allow customers to quickly develop custom solutions directly for their specific use cases.
Highlighted Features
- The first gas sensor with AI: Trainable to detect different gas mixtures and their presence (e.g. coffee) with Bosch's AI Studio
- High-performance 4-in-1 environmental sensor: Detect gas, humidity, temperature, and barometric pressure sensing in a compact size
- Detect a wide variety of gases: Volatile organic compounds (VOCs), volatile sulfur compounds (VSCs), and other gases such as carbon monoxide and hydrogen in the part per billion (ppb) range
- High accuracy: Measure humidity with ±3% accuracy, temperature with ±1.0°C accuracy, +-1C and barometric pressure with ±1 hPa absolute accuracy
- Easy to use: Compatible with Grove port, just plug-and-play
Applications
- Indoor and outdoor air quality measurement
- Bad breath or spoiled food detection based on the measurement of volatile sulfur compounds, which are an indicator of bacteria growth
- Detection of unusual gases and smells, which might indicate for instance a leakage or fire
- Diaper state detection, e.g. for baby care
- Early detection of odors & bad smells
- Wildfire detection
Specifications
| Dimensions | 24mm L * 20mm W * 9.9mm H |
| Weight | G.W 7.5g |
| Battery | Exclude |
| Operating Voltage | 3.3V/V |
| Operating Range | -40~+85℃; 0-100% r.H.; 300-1100hPa |
| Humidity Absolute Accuracy | ± 3%r.H. (20-80 %r.H.,25℃) |
| Humidity Resolution | 0.008 %r.H. |
| Pressure Absolute Accuracy | ± 0.6 hPa (300-1100 hPa, 0-65℃) |
| Pressure Resolution | 0.18 Pa， the highest oversampling |
| Temperature Absolute Accuracy | ±1.0°C |
| Temperature Resolution | 0.01℃ |
| Digital Interface | I2C(up to 3.4MHZ)/ SPI(3 and 4 wire, up to 10MHz) |
| I2C address | 0x76(default)/ 0x77(optional) |
Hardware Overview
Figure: Device Schematics