BME680 Humidity, Pressure, Temperature and Gas Sensor Probe MRS Type -7Semi
What this sensor is
The 7Semi BME680 Sensor Probe (MRS Type) is a 4-in-1 environmental sensor that measures:
Temperature
Humidity
Atmospheric Pressure
Gas (VOC / Air Quality)
It's based on Bosch BME680, one of the most popular all-in-one environmental sensors
Core Concept (VERY IMPORTANT)
This sensor = environmental + air quality combo
Unlike SHT40 (only temp + humidity):
BME680 gives:
Weather data (temp + humidity + pressure)
Air quality (VOC-based gas sensing)
One sensor = multiple parameters in one chip
Key Specific00% RH
Pressure Range: 3001100 hPa
Gas Detection: VOC gases (air quality)
Interface: I2C / SPI
Operating Voltage: ~1.7V3.6V
I2C Address: 0x76 / 0x77
What it can detect
Environmental data
Temperature
Humidity
Air pressure
Air quality
VOC gases (alcohol, smoke, pollution)
It can also estimate:
IAQ (Indoor Air Quality Index)
eCO (estimated)
Working Principle
Uses MEMS sensor technology
Gas sensor uses heated MOX element
Prs
Algorithm converts to:
IAQ
VOC level
Sensor creates a gas fingerprint for air quality
Probe Version (MRS Type Important)
This version is industrial-style probe, not just PCB
Features:
Metal housing (dust protection)
Breathable filter membrane
1-meter cable
4-wire I2C output
Better for:
Harsh environments
Outdoor/industrial use
Typical Wiring (Probe)
Red VCC
Black GND
Yellow SDA
Green SCL
Air quality + environment combined
Digital output (easy integration)
Industrial probe option available
Applications
Weather stations
Smart home automation
Indoor air quality monitoring
Smart agriculture
Industrial sensing
IoT environmental logging
Important Notes (VERY IMPORTANT)
1. Not true gas measurement
Does NOT give exact ppm of gases
Gives VOC-based air quality index
2. Needs calibration time
Burn-in time: ~20 minutes+
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Compensation improves accuracy
4. Self-heating issue
Gas heater can slightly increase temperature reading
Keep away from heat-sensitive placement
BME680 vs Other Sensors
Sensor | Parameters | Accuracy | Use |
SHT40 | Temp + Humidity | High | Simple |
ENS160 | AQI + eCO | High | Air quality |
SGP40 | VOC Index | Medium | VOC trend |
BME680 | 4-in-1 | Good | All-in-one |
When to use this
Use BME680 if you want:
All-in-one environmental sensor
Compact IoT system
Weather + air quality together
Fewer modules (space-saving)
You need true CO sensor (use SCD40)
You want best-in-class accuracy per parameter
high accuracy gas measurement
Final Understanding
This sensor = all-in-one environmental + air quality sensor Best for compact IoT systems with multiple data needs
Pro Tip (Very Useful)
Best combo (advanced system):
BME680 All-in-one basic sensing
SHT41 High-accuracy temp/humidity
ENS160 Advanced AQI