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SGP41 / SGP40 / SGP30 Air Quality Sensor Module — TVOC, eCO2 & Formaldehyde Detector for Arduino & Raspberry Pi
SGP41 / SGP40 / SGP30 Air Quality Sensor Module TVOC, eCO2 & Formaldehyde Detector for Arduino & Raspberry Pi
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SGP41 / SGP40 / SGP30 Air Quality Sensor Module — TVOC, eCO2 & Formaldehyde
This breakout module brings Sensirion’s industry-leading SGP-series metal oxide semiconductor (MOX) gas sensors to your Arduino, Raspberry Pi, or ESP32 project. Depending on the variant selected, the module uses the SGP30 (TVOC + eCO2), SGP40 (VOC index), or SGP41 (VOC index + NOx index) sensor IC, all communicating via I2C for simple integration. Ideal for indoor air quality monitoring, HVAC control, smart home automation, and environmental research.
Key Specifications
| Parameter | Value |
|---|---|
| Sensor Options | SGP30 / SGP40 / SGP41 (select variant) |
| Measured Parameters | SGP30: TVOC (ppb) + eCO2 (ppm) | SGP40: VOC Index | SGP41: VOC Index + NOx Index |
| Interface | I2C (address 0x58) |
| Supply Voltage | 3.3V / 5V compatible |
| Module Size | SGP30: 13×10.5mm | SGP40/41: 25.5×18mm (approx.) |
| Compatible Platforms | Arduino, Raspberry Pi, ESP32, ESP8266, STM32 |
| Origin | CN |
SGP30 vs SGP40 vs SGP41 — Which to Choose?
| Model | Outputs | Best For |
|---|---|---|
| SGP30 | TVOC (ppb) + eCO2 (ppm) | Basic indoor air quality monitoring with absolute concentration values |
| SGP40 | VOC Index (1–500) | Relative air quality trending; lower power, simpler integration |
| SGP41 | VOC Index + NOx Index | Advanced IAQ with both VOC and NOx monitoring for HVAC and research |
Typical Applications
- Indoor air quality (IAQ) monitors for homes, offices, and classrooms
- HVAC demand-controlled ventilation systems
- Smart home air quality dashboards (Home Assistant, ESPHome)
- Formaldehyde and VOC detection in newly furnished rooms
- Environmental research and data logging projects
- CO2 proxy monitoring for occupancy detection
Frequently Asked Questions
Q: Does the SGP30 measure actual CO2?
No. The SGP30 outputs eCO2 (equivalent CO2), which is an estimated value derived from TVOC measurements using an algorithm. It is not a direct NDIR CO2 measurement. For accurate CO2 readings, use an SCD40 or MH-Z19 NDIR sensor.
Q: Does the module require a humidity sensor for compensation?
The SGP40 and SGP41 support humidity compensation via I2C input from an external sensor (e.g., SHT40). Compensation improves VOC index accuracy but is optional — the module operates without it using default compensation values.
Package Contents
- 1× SGP30 / SGP40 / SGP41 Air Quality Sensor Breakout Module (variant per selection)
