Could you tell me what's wrong with this code? It won't send a message to the user at all.

Question

#include <SoftwareSerial.h>
#include <LiquidCrystal.h>

SoftwareSerial mySerial(11, 10);
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);

int gasPin = A0;
int buzzerPin = 12;
int data = 120;
int greenLedPin = 8;
int redLedPin = 9;

void setup() {
Serial.begin(9600);
mySerial.begin(9600);
mySerial.println("AT+CMGF=1");
delay(1000);
mySerial.println("AT+CSCA=\"[phone]\"");
delay(1000);
lcd.begin(16, 2);
pinMode(gasPin, INPUT);
pinMode(buzzerPin, OUTPUT);
pinMode(greenLedPin, OUTPUT);
pinMode(redLedPin, OUTPUT);

lcd.begin(16, 2);
lcd.clear();
lcd.setCursor(1, 0);
lcd.print("GAS DETECTION");
lcd.setCursor(0, 1);
lcd.print("SYSTEM");
delay(1000);
lcd.clear();
}

void loop() {
int gasValue = analogRead(gasPin);
Serial.print("Gas Value: ");
Serial.println(gasValue);
lcd.setCursor(0, 0);
lcd.print("Gas Value: ");
lcd.setCursor(12, 0);
lcd.print(gasValue);
delay(1000);
if (gasValue > data) {
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("GAS LEAKAGE");

Answer 1

You didn’t close the last if block and the void loop() function.
Add at the end of your code:
}
}
And it might work

Answer 2

looks like an Arduino code.

Hard to tell from the partial code.

Could be hardware or software problem. Did you upload the program properly? Is your hardware working properly?