ET-S12
BME688 Gas & Environmental Sensor
VOC gas plus temperature, humidity and pressure
AED 59.00
Out of stockOverview
VOC gas plus temperature, humidity and pressure
The ET-S12 is built around the Bosch BME688 — gas (MOX, heater profiles, BSEC AI), T, RH, pressure. It connects over I²C 0x77 / 0x76 (JP3) and is powered from VIN 3.3–5.5V, onboard LDO.
Two Qwiic / STEMMA QT connectors let you chain it with other boards without soldering, and the 2.54 mm header fits a breadboard.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Indoor air-quality nodes
- Smell and gas pattern detection with AI
- Weather and climate logging
Key features
What makes it different
Sensor
Bosch BME688: gas (MOX, heater profiles, BSEC AI), T, RH, pressure
Interface
I2C 0x77 / 0x76 (JP3)
Supply
VIN 3.3–5.5V, onboard LDO
Libraries
Bosch BME68x + BSEC2, Adafruit_BME680 (compatible), ESPHome bme68x_bsec2
Qwiic / STEMMA QT
Two JST-SH connectors plus a 2.54 mm header — 3.3 V and 5 V hosts.
Open documentation
Schematic, BOM and layout notes published for every board.
Specifications
Technical specifications
| Sensor | Bosch BME688: gas (MOX, heater profiles, BSEC AI), T, RH, pressure |
|---|---|
| Interface | I2C 0x77 / 0x76 (JP3) |
| Supply | VIN 3.3–5.5V, onboard LDO |
| Size | 25.4 × 17.8 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 2 × Qwiic / STEMMA QT (JST SH 4-pin) · 5-pin 2.54 mm header |
| Main IC | BME688 (LCSC C3664478) |
| Revision | Rev B |
| Libraries | Bosch BME68x + BSEC2, Adafruit_BME680 (compatible), ESPHome bme68x_bsec2 |
|---|
| JP1 (default Closed) | Cut to turn off the LED |
|---|---|
| JP2 (default Closed) | Cut to remove the host-side I2C pull-ups |
| JP3 (default Open) | Bridge → SDO=GND → address 0x76 |
Performance
Gas sampling modes
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | Power | 3.3–5.5V |
| 2 | 3V3 | Power | LDO output |
| 3 | GND | Ground | Ground |
| 4 | SCL | I²C | I²C clock |
| 5 | SDA | I²C | I²C data |
Qwiic / STEMMA QT pins: GND, VIN, SDA, SCL (same on both connectors). I²C pull-ups (10 kΩ) are on the board; cut JP2 to remove them.
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-S12 BME688 Gas & Environmental Sensor (assembled)
- 1 × 5-pin 2.54 mm male header, unsoldered
Getting started
- Plug in a Qwiic / STEMMA QT cable, or solder the header and wire VIN, GND, SDA and SCL
- Libraries: Bosch BME68x + BSEC2, Adafruit_BME680 (compatible), ESPHome
bme68x_bsec2 - Run an I²C scanner to confirm the address: 0x77, 0x76
Compare
Which environmental sensor?
| BME688 Gas & Environmental Sensor (this board)This board | ET-S01 BME280 Environmental Sensor | ET-S11 SHT41 Temperature & Humidity Sensor | ET-S15 BMP390 Precision Barometer | |
|---|---|---|---|---|
| What it does | VOC gas plus temperature, humidity and pressure | Temperature, humidity and pressure, Qwiic + header | ±0.2 °C / ±1.8 %RH Sensirion sensor, Qwiic | High-precision pressure and altitude, ±0.03 hPa |
| Interface | I²C 0x77 / 0x76 (JP3) | I²C, 0x77 default / 0x76 (JP3) | I²C, fixed 0x44 | I²C 0x77 / 0x76 (JP3), INT |
| Best for | Indoor air-quality nodes | Weather stations and data loggers | Accurate room climate sensing | Drone and rocket altimeters |
| Price | 59 AED | 49 AED | 19 AED | 39 AED |
Downloads
Documents and design files
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