Fire-Alarm-System-using-Arduino/Fire_Alarm_System.ino at main · deep-chatterjee/Fire-Alarm-System-using-Arduino · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x20, 16, 2);

int sensorPin = A0;
int buzzer = 8;
int led = 9;

int lowThreshold = 300;
int mediumThreshold = 450;

void setup() {
  pinMode(buzzer, OUTPUT);
  pinMode(led, OUTPUT);

  lcd.init();
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("Fire System");

  Serial.begin(9600);
}

void loop() {
  int value = analogRead(sensorPin);
  Serial.println(value);

  if (value < lowThreshold) {
    // LOW
    lcd.setCursor(0, 0);
    lcd.print("Status: SAFE  ");
    lcd.setCursor(0, 1);
    lcd.print("Smoke: LOW    ");

    digitalWrite(buzzer, LOW);
    digitalWrite(led, LOW);

  } else if (value < mediumThreshold) {
    // MEDIUM
    lcd.setCursor(0, 0);
    lcd.print("Warning Level ");
    lcd.setCursor(0, 1);
    lcd.print("Smoke: MEDIUM ");

    digitalWrite(buzzer, LOW);
    digitalWrite(led, HIGH);

  } else {
    // HIGH
    lcd.setCursor(0, 0);
    lcd.print("FIRE ALERT!!! ");
    lcd.setCursor(0, 1);
    lcd.print("Smoke: HIGH   ");

    digitalWrite(buzzer, HIGH);
    digitalWrite(led, HIGH);
  }

  delay(300);
}