How to Use Adafruit ENS160 MOX Gas Sensor: Examples, Pinouts, and Specs

The Adafruit ENS160 MOX Gas Sensor (Part ID: 5606) is a digital metal-oxide (MOX) gas sensor designed for indoor air quality monitoring. It is capable of detecting various gases and volatile organic compounds (VOCs), making it an essential component for applications such as air purifiers, HVAC systems, and smart home devices. This sensor provides accurate and reliable measurements, ensuring optimal indoor air quality.

1. Power Supply: Connect the VCC pin to a 3.3V or 5V power supply and the GND pin to the ground.
2. I2C Interface: Connect the SDA pin to the SDA pin on your microcontroller and the SCL pin to the SCL pin on your microcontroller.
3. Optional Connections: If using SPI, connect the CS, SDO, and SDI pins accordingly. The INT pin can be used for interrupt-driven applications.

• Power Supply: Ensure a stable power supply to avoid fluctuations that could affect sensor readings.
• I2C Pull-up Resistors: Use appropriate pull-up resistors (typically 4.7kΩ) on the SDA and SCL lines if not already present on your microcontroller.
• Warm-up Time: Allow the sensor to warm up for a few minutes after powering on to ensure accurate readings.
• Calibration: Periodically calibrate the sensor in a clean air environment to maintain accuracy.

#include <Wire.h>
#include "Adafruit_ENS160.h"

// Create an instance of the sensor
Adafruit_ENS160 ens160;

void setup() {
  Serial.begin(115200);
  // Initialize I2C communication
  Wire.begin();
  
  // Initialize the sensor
  if (!ens160.begin()) {
    Serial.println("Failed to find ENS160 sensor!");
    while (1);
  }
  Serial.println("ENS160 sensor found!");
}

void loop() {
  // Read gas concentrations
  ens160.readGas();
  
  // Print the gas concentrations
  Serial.print("eCO2: ");
  Serial.print(ens160.eCO2);
  Serial.print(" ppm, TVOC: ");
  Serial.print(ens160.TVOC);
  Serial.println(" ppb");
  
  // Wait for 1 second before the next reading
  delay(1000);
}

1. Sensor Not Detected: Ensure proper connections and check the I2C address (default is 0x53).
2. Inaccurate Readings: Allow sufficient warm-up time and perform regular calibration.
3. Communication Errors: Verify pull-up resistors on the I2C lines and ensure no address conflicts.

• Check Connections: Double-check all wiring and ensure secure connections.
• Power Supply: Use a stable and clean power supply to avoid noise and fluctuations.
• Library Updates: Ensure you have the latest version of the Adafruit ENS160 library installed.

By following this documentation, users can effectively integrate and utilize the Adafruit ENS160 MOX Gas Sensor in their projects, ensuring accurate indoor air quality monitoring.