The if message (gas detected) doesn't appear when I test the gas sensor

Other Hardware Sensors
1 
void setup() {
  Serial.begin(9600);

}

void loop() {
  int data=analogRead(A0);
  int mapper= map(data,0,1023,0,255);
  if(mapper>220)
  {
      Serial.println("Gas detected");     // debug value
 
  }

  else 
  {
    
    Serial.println("No gas detected");
    }
}

And I'm sure that the circuit is great and nth wront with it

2

Have you tried values lower than 220?

Have you tried replacing the sensor with a pot to simulate the sensor signal, for troubleshooting?

Insert serial prints to confirm the values of your data and mapper variables.

3

No, I didn't, what do u suggest, what number would make it work. The thing is I'm a beginner and I'm still learning and I don't have much experience in this.

4

Can you fix it?

5

Hello
add a simple Serial.println(analogRead(A0); to see what happens.

6

AKA

int mapper = data / 4;
7

I did, nth changed

8

But something got printed, surely?

9

Still not working

10

Don't ever use that phrase again.

11

What did you do and what not happens ?

12

Yes, it prints No gas detected but when I press the logic toggle nth change and the second message doesn't appear

13

No, what VALUE does it print?

14

show your wiring diagram and a photo.

15

It doesn't print any value

16

Well make it print the value of "data" as already suggested.

17

not detected
not detected1446×775 52.1 KB

18

Have you built the physical circuit?

19

not detected 2
not detected 21506×800 52.3 KB

This when I press on the logic toggle

20

I build nth but this, and under the instruction of a guy on the youtube