Interfacing Oxygen Sensor with Arduino

Introduction

Oxygen sensors are essential components in the automotive industry as they help to measure the amount of oxygen in a car’s exhaust gas. These sensors play a crucial role in ensuring that the vehicle’s engine runs efficiently, and emissions are kept to a minimum. In recent years, the use of Arduino boards has become increasingly popular in DIY projects, including automotive applications. In this article, we will explore how to use an Oxygen sensor with an Arduino” board to create a cost-effective and straightforward solution for monitoring and controlling vehicle emissions.

What is Oxygen Sensor?

An oxygen sensor, also known as an O2 sensor, is an electronic device that measures the level of oxygen in a particular environment. Oxygen sensors are commonly used in automotive engines to measure the amount of oxygen in the exhaust gases and adjust the air-to-fuel ratio for optimal performance and reduced emissions. They are also used in industrial processes, medical devices, and environmental monitoring systems. Oxygen sensors work by producing a voltage signal that is proportional to the level of oxygen in the environment being measured. This signal can be used to control other components in a system or to provide feedback on the quality of the air being monitored.

Hardware Components

To interface Oxygen Sensor with Arduino, you’ll need the following hardware components to get started:

Components	Value	Qty
Arduino UNO	–	1
USB Cable Type A to B	–	1
DC Power for Arduino	–	1
Oxygen Sensor	–	1
Jumper Wires	–	1

Oxygen Sensor Pinout

Pin Name	Pin Description
GND	Ground Pin
VCC	+5V Pin
SDA	Serial Data Pin
SCL	Serial Clock Pin

Oxygen Sensor Arduino Circuit

Make connections according to the circuit diagram given below.

Wiring / Connections

Arduino	Oxygen Sensor
5V	VCC
GND	GND
A4	SDA
A5	SCL

Installing Arduino IDE

First, you need to install Arduino IDE Software from its official website Arduino. Here is a simple step-by-step guide on “How to install Arduino IDE“.

Installing Libraries

Before you start uploading a code, download and unzip the following libraries at /Program Files(x86)/Arduino/Libraries (default), in order to use the sensor with the Arduino board. Here is a simple step-by-step guide on “How to Add Libraries in Arduino IDE“.

• DFRobot_OxygenSensor.h

Code

Now copy the following code and upload it to Arduino IDE Software.

#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);
}

Code Explanation

This code is for interfacing an oxygen sensor with an Arduino board. It includes the DFRobot_OxygenSensor library and defines the collect number and the IIC slave address of the oxygen sensor.

In the setup function, serial communication is initiated, and the oxygen sensor is initialized using the begin function. The while loop is used to check whether the oxygen sensor is connected to the correct IIC address, and a message is printed on the serial monitor accordingly.

In the loop function, the ReadOxygenData function is used to collect the oxygen data, and the result is printed on the serial monitor. The delay function is used to pause the program for one second before starting the next iteration of the loop.

Overall, this code initializes the oxygen sensor, collects data from the sensor, and prints the result on the serial monitor.

Applications

• Automotive engines for adjusting air-to-fuel ratio and reducing emissions
• Medical devices for monitoring oxygen levels in patients
• Industrial processes for controlling the amount of oxygen in the production
• Environmental monitoring systems for measuring air quality
• Aquaculture systems for maintaining oxygen levels in fish tanks
• Aerospace applications for measuring the oxygen level in spacecraft and aircraft
• HVAC systems for optimizing air quality and energy efficiency
• Agricultural applications for monitoring oxygen levels in soil and crop growth chambers.

Conclusion.

In conclusion, using an oxygen sensor with an Arduino board is a practical and affordable way to measure the oxygen content in a car’s exhaust gas. This DIY project is easy to set up and can help vehicle owners monitor their emissions, ensuring that their cars are running efficiently and not harming the environment