Gravity: Electrochemical Oxygen / O2 Sensor (0-25%Vol, I2C) (ของแท้จาก DFRobot)

• High sensitivity
• I2C Interface
• Compatible with both 3.3V and 5V micro-controllers
• Polarity protection

Specifications

• Detection of Gas: oxygen
• Operating Voltage: 3.3 to 5.5V DC
• Output Signal: I2C output
• Measurement Range: 0~25%Vol
• Maximum Measurement limit: 30%Vol
• Resolution: 0.15%Vol
• Sensitivity: (0.10±0.05) mA (in the air)
• Stability: <2% (Every month)
• Repeatability: <2%
• Response Time: ≤15 seconds
• Operating Temperature: -20～50℃
• Operating humidity: 0～99%RH (no condensation)
• Pressure Range: standard atmospheric pressure ±10%
• Lifetime:> 2 years (in the air)
• Dimension(L x W x H): 37 x 27 x 24.5 mm/1.46 x 1.06 x 0.97 inches
• Weight:0.037kg

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Board Overview

Tutorial

Download the program to Arduino UNO and open the serial monitor to check the O2 concentration.

Requirements

• Hardware

  • DFRduino UNO R3 (or similar) x 1
  • Gravity: I2C Oxygen Sensor x 1

• Software

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

Connection Diagram

Sample Code

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

 /*!
* @file ReadOxygenData.ino
* @brief Read oxygen concentration ,The unit is concentration percent (% vol).
* @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 And then read the data.
* @n note: it takes time to stable oxygen concentration, about 8 minutes.
*
* @n The experimental phenomenon is that a certain percentage of oxygen concentration is printed on the serial port.
* @n Because the oxygen concentration in oxygen air is certain, the data will not be greater than 25% vol.
*
* @copyright Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
* @licence The MIT License (MIT)
* @author ZhixinLiu(zhixin.liu@dfrobot.com)
* @version V0.2
* @date 2019-10-10
* @get from https://www.dfrobot.com
* @url */
#include "DFRobot_OxygenSensor.h"

#define COLLECT_NUMBER 10 // collect number, the collection range is 1-100.
#define Oxygen_IICAddress 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_OxygenSensor Oxygen;
void setup()
{
Serial.begin(9600);
while(!Oxygen.begin(Oxygen_IICAddress)) {
Serial.println("I2c device number error !");
delay(1000);
}
Serial.println("I2c connect success !");
}

void loop()
{
float oxygenData = Oxygen.ReadOxygenData(COLLECT_NUMBER);
Serial.print(" Oxygen concentration is ");
Serial.print(oxygenData);
Serial.println(" %vol");
delay(1000);
}

Expected Results

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)

Calibration

The oxygen sensor can be calibrated using the characteristic that the oxygen content in the atmosphere is 20.9%.

Calibration Method:Place the oxygen sensor in the outdoor environment, after the sensor data is stable, long press the calibration button on the sensor for 2 seconds, the sensor will be calibrated.