Grove Gas Sensor O2

Grove-Gas Sensor (O2) is a kind of sensor to test the oxygen concentration in air, which is based on the principle of the electrochemical cell to the original work. You can know clearly the current oxygen concentration when you output voltage values proportional to the concentration of oxygen and refer to the oxygen concentration linear characteristic graph. It's very suitable for detecting oxygen concentration in the environment protection. Grove - Gas Sensor(O2) is an organic reaction module, it can provide a little current while putting it in the air, we don't need to provide an external power to it, and output voltage will change as time current changes.

Feature

High-precision
High sensitivity
Wide linearity range
Strong anti-interference ability
Extraordinary reliability

!!!Tip More details about Grove modules please refer to Grove System

Specification

Items

Parameter

Measurement Range

0-25%

Detect Life

two years

Sensitivity

0.05~0.15 mA(in air)

Temperature Range

-20 oC~50 oC

Preheat Time

20 minutes

Platforms Supported

Getting Started

!!!Note This chapter is based on Win10 and Arduino IDE 1.6.9

This an easy-to-use module, what you need to do is connect the signal pin (the YELLOW pin of Grove cable) to the ADC input of your controller. If there's no internal ADC in your controller, Grove - I2C ADC is recommend.

Here we will show you how this Grove - Gas Sensor(O2) works via a simple demo. First of all, you need to prepare the below stuffs:

Seeeduino V4

Grove - Gas Sensor(O2)

Base Shield

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Connection

Thanks to the benefit of Grove series modules, you don't need to make soldering or bread board, what you need to do is connect the modules to the right port of Base Shield. For this demo, we have only one Grove module.

Grove - Sound Sensor is an analog output module, we connect it to A0 at this demo

Upload the code to Arduino

Copy the below code to Arduino IDE.

// Grove - Gas Sensor(O2) test code
// Note:
// 1. It need about about 5-10 minutes to preheat the sensor
// 2. modify VRefer if needed

const float VRefer = 3.3;       // voltage of adc reference

const int pinAdc   = A5;

void setup() 
{
    // put your setup code here, to run once:
    Serial.begin(9600);
    Serial.println("Grove - Gas Sensor Test Code...");
}

void loop() 
{
    // put your main code here, to run repeatedly:
    float Vout =0;
    Serial.print("Vout =");

    Vout = readO2Vout();
    Serial.print(Vout);
    Serial.print(" V, Concentration of O2 is ");
    Serial.println(readConcentration());
    delay(500);
}

float readO2Vout()
{
    long sum = 0;
    for(int i=0; i<32; i++)
    {
        sum += analogRead(pinAdc);
    }

    sum >>= 5;

    float MeasuredVout = sum * (VRefer / 1023.0);
    return MeasuredVout;
}

float readConcentration()
{
    // Vout samples are with reference to 3.3V
    float MeasuredVout = readO2Vout();

    //float Concentration = FmultiMap(MeasuredVout, VoutArray,O2ConArray, 6);
    //when its output voltage is 2.0V,
    float Concentration = MeasuredVout * 0.21 / 2.0;
    float Concentration_Percentage=Concentration*100;
    return Concentration_Percentage;
}