Hello there
I bought a new Grove - Gas Sensor(O₂) and loaded the code from the Seed Wiki Website.
Unfortunately, the displayed values are totally wrong (see screenshot). Does any one of you have an idea why?
Thank you for your answers in advance
[code]// 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;
}[/code]
