ET-S01
BME280 Environmental Sensor
Temperature, humidity and pressure, Qwiic + header
AED 49.00
Out of stockOverview
Temperature, humidity and pressure, Qwiic + header
The ET-S01 is built around the Bosch BME280 — temperature ±1°C, humidity ±3%RH, pressure ±1hPa. It connects over I²C (0x77 default / 0x76 (JP3)) and is powered from VIN 3.3–5.5V, onboard 3.3V 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
- Weather stations and data loggers
- Smart-home climate nodes
- Altitude estimate for drones
Key features
What makes it different
Sensor
Bosch BME280: temperature ±1°C, humidity ±3%RH, pressure ±1hPa
Interface
I2C, 0x77 default / 0x76 (JP3)
Supply
VIN 3.3–5.5V, onboard 3.3V LDO
Logic
3.3V and 5V hosts (BSS138 level shifter)
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 BME280: temperature ±1°C, humidity ±3%RH, pressure ±1hPa |
|---|---|
| Interface | I2C, 0x77 default / 0x76 (JP3) |
| Supply | VIN 3.3–5.5V, onboard 3.3V LDO |
| Logic | 3.3V and 5V hosts (BSS138 level shifter) |
| 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 | BME280 (LCSC C92489) |
| Revision | Rev B |
| Libraries | Adafruit_BME280, SparkFun BME280, CircuitPython adafruit_bme280, ESPHome bme280_i2c |
|---|
| JP1 (default Closed (trace)) | Cut to turn off the power LED (keeps heat and current away from the sensor) |
|---|---|
| JP2 (default Closed (3-pad)) | Cut to remove the host-side 10k pull-ups |
| JP3 (default Open) | Bridge to set SDO=GND → address 0x76 (a 10k pull-up holds SDO high for 0x77) |
Performance
Power draw at one reading per second
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | Power | 3.3–5.5V in |
| 2 | 3V3 | Power | Regulator output, up to ~100mA spare |
| 3 | GND | Ground | Ground |
| 4 | SCL | I²C | Host logic level |
| 5 | SDA | I²C | Host logic level |
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-S01 BME280 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: Adafruit_BME280, SparkFun BME280, CircuitPython adafruit_bme280, ESPHome
bme280_i2c - Run an I²C scanner to confirm the address: 0x77, 0x76
Compare
Which environmental sensor?
| BME280 Environmental Sensor (this board)This board | ET-S11 SHT41 Temperature & Humidity Sensor | ET-S12 BME688 Gas & Environmental Sensor | ET-S15 BMP390 Precision Barometer | |
|---|---|---|---|---|
| What it does | Temperature, humidity and pressure, Qwiic + header | ±0.2 °C / ±1.8 %RH Sensirion sensor, Qwiic | VOC gas plus temperature, humidity and pressure | High-precision pressure and altitude, ±0.03 hPa |
| Interface | I²C, 0x77 default / 0x76 (JP3) | I²C, fixed 0x44 | I²C 0x77 / 0x76 (JP3) | I²C 0x77 / 0x76 (JP3), INT |
| Best for | Weather stations and data loggers | Accurate room climate sensing | Indoor air-quality nodes | Drone and rocket altimeters |
| Price | 49 AED | 19 AED | 59 AED | 39 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.