Arduino-Based Intelligent Warehouse Monitoring and Safety System

1#include <Wire.h>
2#include <LiquidCrystal_I2C.h>
3#include <DHT.h>
4// Pin definitions
5#define PIR_PIN 2
6#define IR_PIN 3
7#define LED_PIN 8
8#define BUZZER_PIN 9
9#define DHT_PIN 4
10// DHT11 sensor type
11#define DHT_TYPE DHT11
12// Initialize LCD (20 columns, 4 rows)
13LiquidCrystal_I2C lcd(0x3f, 20, 4);
14// Initialize DHT sensor
15DHT dht(DHT_PIN, DHT_TYPE);
16void setup()
17{
18  Serial.begin(9600);
19  pinMode(PIR_PIN, INPUT);
20  pinMode(IR_PIN, INPUT);
21  pinMode(LED_PIN, OUTPUT);
22  pinMode(BUZZER_PIN, OUTPUT);
23  digitalWrite(LED_PIN, LOW);
24  digitalWrite(BUZZER_PIN, LOW);
25  // Initialize LCD
26  lcd.init();
27  lcd.backlight();
28  lcd.clear();
29  // Initialize DHT11
30  dht.begin();
31  // Startup message
32  lcd.setCursor(0, 0);
33  lcd.print("WAREHOUSE SYSTEM");
34  lcd.setCursor(0, 1);
35  lcd.print("Initializing...");
36  delay(2000);
37  lcd.clear();
38}
39void loop()
40{
41  // Read DHT11 temperature and humidity
42  float temperature = dht.readTemperature();
43  float humidity = dht.readHumidity();
44  // Read IR sensor
45  int irState = digitalRead(IR_PIN);
46  // Read PIR sensor
47  int pirState = digitalRead(PIR_PIN);
48  // Display temperature
49  lcd.setCursor(0, 0);
50  lcd.print("Temp: ");
51  if (isnan(temperature))
52  {
53    lcd.print("Sensor Error   ");
54  }
55  else
56  {
57    lcd.print(temperature, 1);
58    lcd.print((char)223);
59    lcd.print("C       ");
60  }
61  // Display humidity
62  lcd.setCursor(0, 1);
63  lcd.print("Humidity: ");
64  if (isnan(humidity))
65  {
66    lcd.print("--");
67  }
68  else
69  {
70    lcd.print(humidity, 1);
71    lcd.print("%   ");
72  }
73  // IR detects object
74  if (irState == LOW)
75  {
76    digitalWrite(LED_PIN, HIGH);
77    digitalWrite(BUZZER_PIN, LOW);
78    lcd.setCursor(0, 1);
79    lcd.print("IR: DETECTED       ");
80    Serial.println("IR: DETECTED");
81    Serial.println("PIR: OFF");
82    Serial.println("SYSTEM: WAITING");
83  }
84  // IR clear: Check PIR motion
85  else
86  {
87    if (pirState == HIGH)
88    {
89      // Motion detected
90      digitalWrite(LED_PIN, LOW);
91      digitalWrite(BUZZER_PIN, HIGH);
92      Serial.println("PIR: MOTION");
93      Serial.println("SYSTEM: ALERT");
94    }
95    else
96    {
97      // No motion
98      digitalWrite(LED_PIN, LOW);
99      digitalWrite(BUZZER_PIN, LOW);
100      lcd.setCursor(0, 3);
101      lcd.print("SYSTEM: READY      ");
102      Serial.println("PIR: NO MOTION");
103      Serial.println("SYSTEM: READY");
104    }
105  }
106  // Print temperature and humidity
107  Serial.print("Temperature: ");
108  if (isnan(temperature))
109    Serial.println("Error");
110  else
111  {
112    Serial.print(temperature, 1);
113    Serial.println(" C");
114  }
115  Serial.print("Humidity: ");
116  if (isnan(humidity))
117    Serial.println("Error");
118  else
119  {
120    Serial.print(humidity, 1);
121    Serial.println(" %");
122  }
123  Serial.println("--------------------");
124  delay(2000);
125}