FablabSU

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Le capteur d'O2 Grove est capteur qui mesure la teneur en dioxygène de l'air.

Il fonctionne en 3V3 et en 5V.

Il nécessite un port analogique.

Il lui faut une vingtaine de minutes pour “chauffer”.

// 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   = A0;
 
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;
}