How to Use Ozone 2 Click: Examples, Pinouts, and Specs

The Ozone 2 Click by MIKROE is a compact and reliable sensor module designed for measuring ozone (O₃) concentration in the air. It features the MQ131 high-precision ozone sensor, which provides accurate and stable readings. The module communicates via the I2C interface, making it easy to integrate into various microcontroller-based systems. This sensor is ideal for applications such as environmental monitoring, air quality assessment, and industrial safety systems.

• Environmental monitoring systems
• Air quality control in residential and industrial areas
• Smart home automation for air purification
• Industrial safety systems to detect harmful ozone levels
• Research and development in atmospheric studies

The Ozone 2 Click module uses a standard mikroBUS™ socket. Below is the pinout description:

1. Power Supply: Connect the module to a 3.3V or 5V power source, depending on your system's requirements. Ensure the onboard jumper is set to the correct voltage.
2. I2C Communication: Connect the SCL (clock) and SDA (data) pins to the corresponding I2C pins on your microcontroller.
3. Initialization: Configure the I2C interface on your microcontroller to communicate with the Ozone 2 Click. The default I2C address is typically provided in the module's datasheet.
4. Reading Data: Use the I2C protocol to read ozone concentration data from the sensor. The data is typically provided in parts per million (ppm).

• Preheating: The MQ131 sensor requires a preheating period (typically 24 hours) for optimal accuracy during the first use.
• Calibration: For precise measurements, calibrate the sensor in a controlled environment with known ozone concentrations.
• Ventilation: Ensure proper airflow around the sensor for accurate readings.
• Avoid Contaminants: Keep the sensor away from dust, oil, and other contaminants that may affect its performance.
• Temperature and Humidity: Operate the sensor within the specified temperature and humidity range for reliable results.

Below is an example of how to interface the Ozone 2 Click with an Arduino UNO using the I2C protocol:

#include <Wire.h>

// Define the I2C address of the Ozone 2 Click module
#define OZONE2_I2C_ADDRESS 0x48

void setup() {
  Wire.begin(); // Initialize I2C communication
  Serial.begin(9600); // Initialize serial communication for debugging

  Serial.println("Ozone 2 Click Initialization...");
}

void loop() {
  Wire.beginTransmission(OZONE2_I2C_ADDRESS); // Start communication with the sensor
  Wire.write(0x00); // Request data from the sensor (register 0x00)
  Wire.endTransmission();

  Wire.requestFrom(OZONE2_I2C_ADDRESS, 2); // Request 2 bytes of data
  if (Wire.available() == 2) {
    uint8_t msb = Wire.read(); // Read the most significant byte
    uint8_t lsb = Wire.read(); // Read the least significant byte

    // Combine the two bytes into a single 16-bit value
    uint16_t ozoneData = (msb << 8) | lsb;

    // Convert the raw data to ppm (example conversion, adjust as needed)
    float ozonePPM = ozoneData * 0.1;

    // Print the ozone concentration to the serial monitor
    Serial.print("Ozone Concentration: ");
    Serial.print(ozonePPM);
    Serial.println(" ppm");
  } else {
    Serial.println("Failed to read data from Ozone 2 Click.");
  }

  delay(1000); // Wait for 1 second before the next reading
}

1. No Data Received from the Sensor

   • Cause: Incorrect I2C wiring or address mismatch.
   • Solution: Verify the I2C connections (SCL and SDA) and ensure the correct I2C address is used in the code.

2. Inaccurate Readings

   • Cause: Sensor not preheated or improperly calibrated.
   • Solution: Allow the sensor to preheat for the recommended duration and calibrate it in a controlled environment.

3. Sensor Not Responding

   • Cause: Incorrect power supply voltage.
   • Solution: Check the onboard jumper setting and ensure the correct voltage (3.3V or 5V) is supplied.

4. Fluctuating Readings

   • Cause: Poor ventilation or environmental interference.
   • Solution: Ensure proper airflow around the sensor and avoid placing it near sources of interference.

Q1: Can the Ozone 2 Click measure other gases?
A1: No, the Ozone 2 Click is specifically designed to measure ozone (O₃) concentration. It is not suitable for detecting other gases.

Q2: How long does the sensor last?
A2: The MQ131 sensor has a typical lifespan of 2-3 years under normal operating conditions. Proper maintenance and usage can extend its lifespan.

Q3: Can I use the Ozone 2 Click with a 5V microcontroller?
A3: Yes, the module supports both 3.3V and 5V operation. Ensure the onboard jumper is set to the appropriate voltage.

Q4: Is the sensor waterproof?
A4: No, the sensor is not waterproof. Avoid exposing it to water or high humidity levels beyond the specified range.

This concludes the documentation for the Ozone 2 Click module. For further assistance, refer to the official datasheet or contact MIKROE support.