wireless monitoring system of gas detector - Faculty of Electrical ...

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void setup()
{
Serial.begin(9600);
pinMode(ledgreen, OUTPUT);
pinMode(ledred,OUTPUT);
pinMode(ledyellow,OUTPUT);
}
Figure 3.15 : Declaration of the pin
Meanwhile, the second loop is mostly the main process for the alarm system
trigger. All the threshold value is declared in this loop. First of all, the system read the
sensor value as shown in Figure 3.16. If the sensor value is over or under the limitation
of threshold value, some indicator as the output system will be turning on. Finally, the
result from the sensor value will be print to the serial monitor. The flow chart of the
programming show in the Figure 3.13.