Gas Sensor

1int red_led=12;//indicates gas
2int green_led=11;//indicates normal
3int
4  buzz=13;//indicates gas
5intsmokeA0 = A5;//indicates sensor is connected to A5
6int
7  sensorThres=400;//The threshold value
8void setup()
9{
10pinMode(red_led,OUTPUT);//red
11  led as output
12pinMode(buzz,OUTPUT);// buzz as output
13pinMode(green_led,OUTPUT);//green
14  led as output
15pinMode(A1,INPUT);//sensor as input
16Serial.begin(9600);//starts
17  the code
18}
19void loop()//loops
20{
21gas_avalue=analogRead(smokeA0);//reads
22  sensor value
23if (A0 > sensorThres)//sees if it reached threshold value
24{
25digitalWrite(red_led,
26  HIGH);//turns on red led
27digitalWrite(green_led, LOW);//turns off green led
28digitalWrite(
29  buzz, HIGH);//turns on buzzer
30}
31else//if it hasn't reached threshold value
32{
33digitalWrite(red_led,
34  LOW);//turns red led off
35digitalWrite(green_led, HIGH);//turn green led on
36digitalWrite(
37  buzz, LOW);//turns buzzer off
38}
39delay(100);//delay 0.1 sec
40}
41

1int red_led=12;//indicates gas
2int green_led=11;//indicates normal
3int  buzz=13;//indicates gas
4intsmokeA0 = A5;//indicates sensor is connected to A5
5int  sensorThres=400;//The threshold value
6void setup()
7{
8pinMode(red_led,OUTPUT);//red  led as output
9pinMode(buzz,OUTPUT);// buzz as output
10pinMode(green_led,OUTPUT);//green  led as output
11pinMode(A1,INPUT);//sensor as input
12Serial.begin(9600);//starts  the code
13}
14void loop()//loops
15{
16gas_avalue=analogRead(smokeA0);//reads  sensor value
17if (A0 > sensorThres)//sees if it reached threshold value
18{
19digitalWrite(red_led,  HIGH);//turns on red led
20digitalWrite(green_led, LOW);//turns off green led
21digitalWrite(  buzz, HIGH);//turns on buzzer
22}
23else//if it hasn't reached threshold value
24{
25digitalWrite(red_led,  LOW);//turns red led off
26digitalWrite(green_led, HIGH);//turn green led on
27digitalWrite(  buzz, LOW);//turns buzzer off
28}
29delay(100);//delay 0.1 sec
30}
31