Example Code for Arduino-Ozone Concentration Monitoring

Hardware Preparation

• DFRduino UNO R3 (or similar) x 1
• Gravity: IIC Ozone Sensor x 1

Software Preparation

• Arduino IDE
• Download and install the DFRobot_OzoneSensor Library. (About how to install the library?)

Wiring Diagram

Other Preparation Work

According to the connection diagram to connect the module to Arduino UNO. In default, the IIC address is 0x73 which corresponds to the ADDRESS_3 in the code. If you want to modify the I2C address, please configure the hardware IIC address by the dial switch and modify the IIC address part: ADDRESS_X in the sample code.
The relationship between the dial switch and IIC address is shown as below:

• ADDRESS_0：0x70, A0=0, A1=0
• ADDRESS_1：0x71, A0=1, A1=0
• ADDRESS_2：0x72, A0=0, A1=1
• ADDRESS_3：0x73, A0=1, A1=1

2. Download and install the DFRobot_OzoneSensor Library. (About how to install the library?)
3. Open Arduino IDE and upload the code below to Arduino UNO.
4. Open the Arduino IDE's serial monitor, adjust the baud rate to 9600, and observe the serial print results.

Sample Code

  /*!
  * @file  ReadOzoneData.ino
  * @brief Reading ozone concentration, A concentration of one part per billion (PPB).
  * @n step: we must first determine the iic device address, will dial the code switch A0, A1 (ADDRESS_0 for [0 0]), (ADDRESS_1 for [1 0]), (ADDRESS_2 for [0 1]), (ADDRESS_3 for [1 1]).
  * @n       Then configure the mode of active and passive acquisition, Finally, ozone data can be read.
  * @n note: it takes time to stable oxygen concentration, about 3 minutes.
  *
  * @n The experimental phenomenon is to print one billionth of the ozone concentration on the serial port.
  * @n Because the value measured by the sensor is less than 10000, the value obtained will not be greater than 10000
  *
  * @copyright   Copyright (c) 2010 DFRobot Co.Ltd (https://www.dfrobot.com)
  * @licence     The MIT License (MIT)
  * @author      ZhixinLiu([email protected])
  * @version     V0.2
  * @date        2019-10-10
  * @get         from https://www.dfrobot.com
  * @url   */
#include "DFRobot_OzoneSensor.h"

#define COLLECT_NUMBER   20              // collect number, the collection range is 1-100
#define Ozone_IICAddress OZONE_ADDRESS_3
/*   iic slave Address, The default is ADDRESS_3
       ADDRESS_0               0x70      // iic device address
       ADDRESS_1               0x71
       ADDRESS_2               0x72
       ADDRESS_3               0x73
*/
DFRobot_OzoneSensor Ozone;
void setup() 
{
  Serial.begin(9600);
  while(!Ozone.begin(Ozone_IICAddress)) {
    Serial.println("I2c device number error !");
    delay(1000);
  }  Serial.println("I2c connect success !");
/*   Set iic mode, active mode or passive mode
       MEASURE_MODE_AUTOMATIC            // active  mode
       MEASURE_MODE_PASSIVE              // passive mode
*/
    Ozone.SetModes(MEASURE_MODE_PASSIVE);
}


void loop() 
{
/*   Smooth data collection
       COLLECT_NUMBER                    // The collection range is 1-100
*/
  int16_t ozoneConcentration = Ozone.ReadOzoneData(COLLECT_NUMBER);
  Serial.print("Ozone concentration is ");
  Serial.print(ozoneConcentration);
  Serial.println(" PPB.");
  delay(1000);
}

Result

Turn on the serial monitor and heat it up for about 3 minutes to get the final data. (Test environment: closed environment with ozone generator)

• The O3 concentration value will be stable after preheat time, which is about 3 minutes. Please ignore the O3 concentration value during preheat time.
• This Gravity: IIC Ozone Sensor may has data drift.
• Please power it up for 24 hours when power it up for the first time.