int red=6;
int green=4;
int yellow=5;
int sensgas=A0;
int speak=2;
void setup()
{
Serial.begin(9600); //Used for serial communication b/w sensor and arduino board
pinMode(red, OUTPUT);
pinMode(green, OUTPUT);
pinMode(yellow, OUTPUT);
pinMode(speak, OUTPUT);
}
void loop()
{
int data_sensor = analogRead(sensgas);
Serial.print("Detect Voltage Level:");
Serial.println(data_sensor);
if (data_sensor ==20){
digitalWrite(green, HIGH);
digitalWrite(yellow, LOW);
digitalWrite(red, LOW);
digitalWrite(speak, LOW);
noTone(speak);
}
else if ((data_sensor >20) && (data_sensor <30)){
digitalWrite(green, LOW);
digitalWrite(yellow, HIGH);
digitalWrite(red, LOW);
digitalWrite(speak, LOW);
noTone(speak);
}
else {
digitalWrite(green, LOW);
digitalWrite(yellow, LOW);
digitalWrite(red, HIGH);
digitalWrite(speak, HIGH);
tone(speak,1000);
}
}
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