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ENS160 + AHT21 Sensor Test (Arduino Uno)

This project reads and displays environmental data using the ENS160 digital air quality sensor and the AHT21 temperature & humidity sensor, both connected via I2C to an Arduino Uno.

🔧 Hardware Used

  • Arduino Uno
  • ENS160 (Air Quality Sensor)
  • AHT21 (Temperature & Humidity Sensor)
  • I2C Wiring

🧩 I2C Pin Connections (Arduino Uno)

Arduino Uno I2C Function Sensor Pin
A4 SDA SDA
A5 SCL SCL
5V VCC VCC
GND GND GND

ENS160 default I2C address used: 0x53
AHT21 is auto-detected by the Adafruit library.

📦 Libraries Required

Install these libraries via the Arduino Library Manager:

🚀 How It Works

  • Initializes both sensors.
  • Reads temperature and humidity from the AHT21.
  • Passes that data to the ENS160 to improve air quality readings.
  • Prints Temperature, Humidity, AQI, TVOC, and eCO2 to the Serial Monitor.
  • Toggles the onboard LED every second.