7Semi SHT40 SGP40 VOC Environmental Monitoring Sensor Module Qwiic-Ready

7Semi SHT40 + SGP40 VOC Environmental Sensor (Qwiic)

Overview

This module is a multi-sensor environmental board that combines:

• SHT40 Temperature + Humidity sensor

• SGP40 VOC (air quality) sensor

Together, it provides complete indoor environment monitoring in a single compact module.

What It Measures

Temperature

• Range: 40C to 125C

• Accuracy: 0.2C

Humidity

• Range: 0100% RH

• Accuracy: 1.8% RH

Air Quality (VOC)

• Detects gases like:

  • Ethanol

  • Acetone

  • Formaldehyde

   

• Output:

  • VOC Index (air quality level)

  + Humidity)

  • Uses high-precision sensing elements

  • Fast response and low power consumption

   

  SGP40 (VOC Sensor)

  • Uses MOx (metal-oxide) gas sensing technology

  • Works like an electronic nose detecting overall air quality

  • Outputs VOC index (not exact ppm gas values)

   

  Key Features

  Dual-sensor module (3-in-1 monitoring) Qwiic / I2C interface plug & play, no soldering 16-bit digital output high precision Low power consumption (~2.63.5 mA) Fast response time (<10 seconds for VOC) Compact and IoT-friendly design

  Technical Specifications

  Pin / Connection (I2C)

  With Qwiic cable, you just plug directly (no wiring needed).

  Applications

  Smart Systems

  • Indoor air quality monitoring

  • Smart homes / HVAC systems

  • Air purifiers

   

  Industrial / IoT

  • Workplace air safety

  • Environmental logging systems

  • Industrial monitoring

  • Weather station

  • Portable air quality device

   

  Advantages

  Combines 3 sensors in one board Very accurate temperature & humidity Stable VOC detection (long-term reliability) Easy integration (I2C + Qwiic) Ideal for IoT and battery-powered projects

  Limitations (Important)

  VOC sensor does NOT give exact gas concentration It gives a relative air quality index (0500)

  Sensitive to:

  • Humidity changes

  • Environmental conditions

   

  Needs:

  • ~1 minute to stabilize after power-on

  • Better accuracy after longer runtime

   

  Compared to Other Sensors

  When Should You Use It?

  Use this module if you need: Accurate temperature + humidity + air quality Clean digital interface (I2C) Compact IoT solution Reliable indoor monitoring

  Pro Tip

  For best VOC results:

  • Always use temperature & humidity compensation (from SHT40)

  • Take readings every 1 second continuously

  • Let sensor run for some