ENS160+AHT21 Air Quality & Environmental Measurement Sensor Module

ENS160+AHT21 Air Quality & Environmental Measurement Sensor Module is a highly integrated, dual-sensor solution designed for real-time indoor air quality monitoring and environmental tracking. This powerful module pairs the ScioSense ENS160 digital multi-gas sensor with the AHT21 temperature and humidity sensor, providing comprehensive atmospheric data through a unified interface. Consequently, it eliminates the need for multiple discrete breakout boards and significantly reduces overall system complexity. The onboard processors compute total volatile organic compounds (TVOC), equivalent carbon dioxide (eCO₂), temperature, and relative humidity directly, passing the finalized data to a host controller via the standard I2C protocol. Therefore, you can effortlessly integrate this module into smart home appliances, IoT climate systems, and HVAC controllers to achieve precise, automated environmental management.

Key Features:

• Dual-Sensor Design: Combines professional-grade gas sensing and digital relative climate measurement on a single compact PCB, maximizing sensing efficiency.
• True VOC Sensing: Employs four independent sensor elements to detect a wide array of volatile gases, including ethanol, toluene, and hydrogen.
• Automatic Baseline Correction: Includes onboard algorithms that automatically recalibrate the gas sensor over time, ensuring long-term accuracy and stability.
• High-Accuracy Climate Tracking: Features the fully calibrated AHT21 sensor chip, providing stable relative humidity and temperature data even in challenging conditions.
• I2C Digital Interface: Utilizes a standard serial bus to deliver digitized data directly, which simplifies wiring and prevents analog signal degradation.

Technical Specifications:

• Operating Supply Voltage: 3.3 V ±5%
• Communication Protocol: I2C (Up to 400 kHz)
• TVOC Measurement Range: 0 ppb to 65000 ppb
• eCO₂ Measurement Range: 400 ppm to 65000 ppm
• Temperature Accuracy: ±0.5°C (From −40°C to +85°C)
• Humidity Accuracy: ±5% RH (From 0% to 100% RH)
• Warm-up Time: ≈ 3 minutes for optimal baseline stabilization

Mechanical Specifications:

• Sensor Components: ScioSense ENS160 (MOX Gas Sensor) and AHT21 (Capacitive Humidity/Temp)
• Substrate Material: High-grade FR-4 Fiberglass PCB
• Mounting Hole Size: ≈ 2.0 mm (Dual mounting holes)
• Connector Interface: Standard 4-pin row with 2.54 mm pitch

Dimensions:

• Module Length: ≈ 20.0 mm
• Module Width: ≈ 15.0 mm
• PCB Thickness: ≈ 1.6 mm
• Net Weight: ≈ 1.8 g

Pinout and Wiring:

• VIN: Connect this pin to the 3.3 V power supply rail of your microcontroller circuit.
• GND: Connect this pin to the main circuit ground (0 V).
• SCL (Serial Clock): Connect to the I2C clock pin of the microcontroller (e.g., A5 on Arduino Uno).
• SDA (Serial Data): Connect to the I2C data pin of the microcontroller (e.g., A4 on Arduino Uno).
• Wiring Note: Furthermore, you should keep the I2C pull-up resistors close to the module to preserve signal integrity over longer wire runs.

Datasheet Reference:

• Download ScioSense ENS160 Digital Multi-Gas Sensor Datasheet

Commonly Used in:

• DIY Weather Stations: Enhancing standard home-brewed telemetry setups with advanced gas and chemical monitoring capabilities.
• IoT Development Kits: Expanding the functionality of modern microcontroller platforms such as ESP32, ESP8266, and Raspberry Pi boards.
• Educational Electronics: Serving as an accessible benchmark device for university chemistry and engineering sensor laboratories.

Applications:

• Indoor Air Quality (IAQ) Control: Automating ventilation fans when TVOC or eCO₂ limits breach healthy thresholds.
• Smart HVAC Systems: Adjusting building air conditioning and heating performance based on exact relative humidity and temperature monitoring.
• Air Purifiers: Enabling intelligent fan speed adjustments on commercial purification systems by detecting ambient organic pollutant levels.
• Kitchen Hood Automation: Triggering exhaust fans instantly when gas concentrations rise during intensive cooking routines.

Equivalent Models:

• CCS811+HDC1080: An older generation multi-gas and humidity module combination, however, it provides slower baseline settling speeds than the ENS160.
• SGP30+SHT31: A premium tier environmental sensor combination offering comparable digital precision for TVOC and climate calculation.
• ENS161 Module: The direct successor version that features lower power standby modes for battery-dependent field nodes.

Package Includes:

• 1 x ENS160+AHT21 Air Quality & Environmental Measurement Sensor Module
• 1 x 8-Pin Male Header Strip (Unsoldered)