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ENS160 AHT21 CO2 eCO2 TVOC Air Quality and Temperature Humidity Sensor Module

$28.20 USD

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ENS160 + AHT21 Air Quality, Temperature & Humidity Sensor Module

Monitor the air you breathe with precision. This dual-chip sensor module combines the ScioSense ENS160 digital multi-gas sensor with the ASAIR AHT21 temperature and humidity sensor on a single compact PCB. Together, they deliver a complete indoor air quality (IAQ) solution — measuring eCO2, TVOC, AQI, temperature, and relative humidity simultaneously via a single I²C bus.

Designed for smart home systems, HVAC controllers, air purifiers, wearables, and IoT environmental monitors, this module gives your project the data it needs to make intelligent decisions about air quality in real time.

ENS160 Multi-Gas Sensor Specifications

Sensor Technology: 4 × Metal Oxide (MOX) sensor elements
Detected Gases: VOCs (toluene, ethanol, hydrogen), NO₂, ozone, and more
eCO2 Output Range: 400 – 65,000 ppm
TVOC Output Range: 0 – 65,535 ppb
AQI Output: 1–5 scale (UBA standard)
Interface: I²C (default) and SPI
Supply Voltage: VDD 1.71–1.98V / VDDIO 1.71–3.6V (onboard regulator for 3.3V/5V input)
Preheat Time: 5–60 minutes for full accuracy
Warm-up Time: <1 minute for initial readings
Startup Time: <1 hour for calibrated baseline
Operating Temperature: −40°C to +85°C
Operating Humidity: 5–95% RH (non-condensing)

AHT21 Temperature & Humidity Sensor Specifications

Supply Voltage: 2.0–5.5V DC
Temperature Range: −40°C to +120°C
Temperature Accuracy: ±0.3°C (typical)
Temperature Resolution: 0.01°C
Humidity Range: 0–100% RH
Humidity Accuracy: ±2% RH at 25°C
Humidity Resolution: 0.024% RH
Interface: I²C (address 0x38)
Package: SMD 3×3mm, 0.8mm height (LCC package)

Module Features

Both sensors share the I²C bus — single cable connection to your microcontroller
Onboard 3.3V LDO regulator — accepts 3.3V or 5V power supply directly
Onboard I²C pull-up resistors — no external components required
Compact PCB with 4-pin header (VCC, GND, SDA, SCL)
ENS160 I²C address: 0x52 (default) or 0x53 (ADDR pin high)
AHT21 I²C address: 0x38 (fixed)

Compatible Platforms

Works with any microcontroller or SBC with I²C support:

ESP32 / ESP8266 — ideal for Wi-Fi connected IAQ monitors and Home Assistant integration
Arduino (Uno, Nano, Mega, MKR) — use ScioSense ENS160 library + Adafruit AHTX0 library
Raspberry Pi — Python smbus2 library for Linux-based data logging
STM32 / RP2040 — HAL I²C or MicroPython support

Typical Applications

Smart home air quality monitors (Home Assistant, ESPHome, MQTT)
HVAC and ventilation control systems
Air purifier feedback and automation
Office and classroom CO₂ and VOC monitoring
Wearable environmental sensors
Industrial hygiene and safety monitoring
School and university IoT projects

ENS160 vs. CCS811: Why ENS160?

The ENS160 uses 4 independent MOX sensor elements with individual heater control, enabling more accurate gas discrimination and faster response than single-element sensors like the CCS811. It also supports raw resistance output for custom gas detection algorithms, making it the preferred choice for professional IAQ applications.