How To Use - Seeed Grove Manual

5.3

How to use

There're two steps you need to do before getting the concentration of gas.
First, connect the module with Grove Shield using A0 like the picture above. And put the sensor in
a clear air and use the program below.
void setup() {
Serial.begin(9600);
}
void loop() {
float sensor_volt;
float RS_air;
float R0; // Get the value of R0 via in LPG
float sensorValue;
/*--- Get a average data by testing 100 times ---*/
for(int x = 0
{
sensorValue
}
sensorValue = sensorValue/100.0;
/*-----------------------------------------------*/
sensor_volt = sensorValue/1024*5.0;
RS_air = (5.0-sensor_volt)/sensor_volt;
R0 = RS_air/9.9;
Serial.print("sensor_volt =
Serial.print(sensor_volt);
Serial.println("V");
Serial.print("R0 =
Serial.println(R0);
delay(1000);
}
Then, open the monitor of Arduino IDE, you can see some data are printed, write down the value
of R0 and you need to use it in the following program. During this step, you may pay a while time
to test the value of R0.
Second, put the sensor in one gas where the environment you want to test in.
// Get the value of RS via in a clear air
; x < 100 ; x++)
= sensorValue + analogRead(A0);
// The ratio of RS/R0 is 9.9 in LPG gas
");
");
// omit *RL
7
However, don't forget