7Semi BME688 Environmental Sensor Probe - Metal (ES-12162)

Overview

The module is based on the Bosch BME688 environmental sensor IC, a multi-parameter MEMS environmental sensor integrated into a metal probe housing.

• Measures:

  • Temperature

  • Relative Humidity

  • Barometric Pressure

  • Gas (VOC / air quality)

   

• Output:

  • Digital data via I2C

   

It is a complete environmental monitoring solution in a rugged probe format.

Working Principle

Temperature Sensing

• Uses bandgap temperature sensing

• Converts temperature changes digital signal

Humidity Sensing

• Uses a capacitive polchanges capacitance

• Converted to digital RH values

Pressure Sensing

• Uses a MEMS piezoresistive pressure sensor

• Measures atmospheric pressure via diaphragm deformation

Gas (Air Quality) Sensing

MOX (Metal-Oxide) Gas Sensor

• Contains a micro-heated sensing layer

• Detects gases by measuring resistance changes

Detection Mechanism

• Heater activates sensing layer

• VOC gases interact with surface

• Resistance changes

• Converted into digital gas signal

Provides air quality indicators (VOC index, IAQ, CO equivalent)

Measurement Characteristics

Temperature

• Range: 40C to +85C

  umidity

  • Range: 0100% RH

  • Accuracy: ~3% RH

  Pressure

  • Range: 300 hPa to 1100 hPa

  • High-resolution atmospheric sensing

  Gas / Air Quality

  • Detects:

    • Volatile Organic Compounds (VOC)

  • Outputs:

    • IAQ (Indoor Air Quality index)

    • bVOC

    • CO equivalent (estimated)

  Electrical Characteristics

  • Supply voltage: ~3.3V (typical)

  • Low power consumption

  • Gas sensing consumes more due to heater cycles

  Communication Interface

  • Interface: I2C digital communication

  • Typical address:

    • 0x76 / 0x77

      Internal Features

      Multi-Sensor Integration

      • Combines 4 sensors in one IC

      • Reduces system complexity

      AI-Based Gas Processing

      • Supports AI algorithms for gas classification

      • Detects air quality patterns (not just raw gas values)

      Environmental Compensation

      • Gas readings compensated using:

        • Temperature

        • Humidity

      High Resolution & Stability

      • Accurate long-term environmental monitoring

      Probe Design Features (Metal Version)

      Metal Housing

      • Durable and corrosion-resistant

      • Suitable for:

        • Industrial environments

        • Outdoor applications

      Air-Permeable Structure

      Remote Sensing Capability

      • Probe format enables:

        • Placement away from main circuit

      Operating Behavior

      Multi-Parameter Measurement

      • Simultaneously measures:

        • Temperature

        • Humidity

        • Pressure

        • Gas

      Gas Sensing Cycle

      • Requires:

        • Heating cycles

        • Stabilization time

      Air Quality Output

      • Provides relative air quality index, not exact gas ppm

      Environmental Characteristics

      • Operating temperature: 40C to +85C

      • Humidity: 0100% RH

      • Pressure: 3001100 hPa