ENS160 + AHT21 CO2 TVOC air quality, temperature and humidity module

This integrated module combines the ENS160 air quality sensor with the AHT21 digital temperature and humidity sensor. It enables simultaneous monitoring of indoor air pollutants—such as CO₂ equivalents and total volatile organic compounds (TVOC) alongside accurate measurements of temperature and relative humidity. Ideal for smart homes, HVAC systems, and IoT-based environmental monitoring, the module provides digital output via I²C and SPI for easy integration.

Key Features

• Dual-sensor integration: gas + environmental sensing

• Measures eCOâ‚‚, TVOC, temperature, and humidity

• Fast startup and low power consumption

• Accurate and stable performance over a wide environmental range

• Compact design for embedded and mobile applications

• Compatible with Arduino, ESP32, Raspberry Pi, and other microcontrollers

Specifications

🔹 Gas Sensor: ENS160

• Detected Gases: Toluene, hydrogen, ethanol, nitrogen dioxide, ozone, and more

• Sensing Elements: Four independent MOX gas sensors

• Output: IAQ (Indoor Air Quality), eCOâ‚‚, TVOC, and AQI (Air Quality Index)

• Communication Interface: I²C and SPI

• Detection Range: 0–65,535 ppb

• Operating Voltage:

  • VDD: 1.71–1.98V

  • VDDIO: 1.71–3.6V

• Warm-up Time: < 1 minute

• Start-up Time: < 60 minutes

• Operating Temp: -40°C to +85°C

• Humidity Range: 5% to 95% RH

🔹 Temperature & Humidity Sensor: AHT21

• Voltage Supply: 2.0V–5.5V

• Temperature Range: -40°C to +120°C

• Humidity Range: 0%–100% RH

• Temperature Accuracy: ±0.3°C

• Humidity Accuracy: ±2% RH

• Resolution:

  • Temp: 0.01°C

  • Humidity: 0.024% RH

• Output Interface: I²C

Applications

• Smart home air quality monitoring

• IoT-based climate and gas sensing platforms

• HVAC system optimization and control

• Indoor AQI dashboards and displays

• Air purifiers and intelligent ventilation systems

• Environmental sensing in schools and public spaces

• Industrial safety and building management systems (BMS)

• Smart agriculture and greenhouse automation