ET-S13
SGP41 VOC & NOx Sensor
Sensirion VOC and NOx index gas sensor
AED 49.00
Out of stockOverview
Sensirion VOC and NOx index gas sensor
The ET-S13 is built around the Sensirion SGP41 — MOX gas sensor giving VOC Index + NOx Index (via Sensirion gas-index algorithm). It connects over I²C (fixed 0x59) and is powered from VIN 3.3–5.5V; VDD/VDDH 3.3V from the LDO (hotplate ~3mA).
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
- Air purifier control
- Kitchen and garage air monitoring
- Indoor air-quality dashboards
Key features
What makes it different
Sensor
Sensirion SGP41: MOX gas sensor giving VOC Index + NOx Index (via Sensirion gas-index algorithm)
Interface
I2C, fixed 0x59
Supply
VIN 3.3–5.5V; VDD/VDDH 3.3V from the LDO (hotplate ~3mA)
Libraries
Sensirion arduino-i2c-sgp41 + gas-index-algorithm, Adafruit SGP41 / CircuitPython, ESPHome sgp4x
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 | Sensirion SGP41: MOX gas sensor giving VOC Index + NOx Index (via Sensirion gas-index algorithm) |
|---|---|
| Interface | I2C, fixed 0x59 |
| Supply | VIN 3.3–5.5V; VDD/VDDH 3.3V from the LDO (hotplate ~3mA) |
| 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 | SGP41-D-R4 (LCSC C3659325) |
| Revision | Rev B |
| Libraries | Sensirion arduino-i2c-sgp41 + gas-index-algorithm, Adafruit SGP41 / CircuitPython, ESPHome sgp4x |
|---|
| JP1 (default Closed) | Cut to turn off the LED |
|---|---|
| JP2 (default Closed) | Cut to remove the host-side I2C pull-ups |
Performance
Reading the index
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-S13 SGP41 VOC & NOx 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: Sensirion arduino-i2c-sgp41 + gas-index-algorithm, Adafruit SGP41 / CircuitPython, ESPHome
sgp4x - Run an I²C scanner to confirm the address: 0x59
Compare
Which air-quality sensor?
| SGP41 VOC & NOx Sensor (this board)This board | ET-S02 SCD41 True CO₂ Sensor | ET-S14 PMS5003 Particulate Sensor Carrier | ET-S12 BME688 Gas & Environmental Sensor | |
|---|---|---|---|---|
| What it does | Sensirion VOC and NOx index gas sensor | Photoacoustic NDIR CO₂ plus temperature and humidity | PM1.0 / PM2.5 / PM10 carrier with level-shifted UART | VOC gas plus temperature, humidity and pressure |
| Interface | I²C, fixed 0x59 | I²C, fixed 0x62 | UART 9600 8N1 + SET (sleep) + RESET | I²C 0x77 / 0x76 (JP3) |
| Best for | Air purifier control | Indoor air-quality monitors | Dust and smoke monitoring | Indoor air-quality nodes |
| Price | 49 AED | 159 AED | 25 AED | 59 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.