Smart Drawer Alarm (Daraz Ka Muhafiz) Robotic Kit

Icon Concept (For Designer)

Ek wooden Drawer (Daraz) thoda sa khula hua hai. Andar se chamak (Light) aa rahi hai aur ek Lock ka icon bana hai jo ‘Unlock’ ho raha hai. Saath mein Buzzer ka icon “Shake” kar raha hai (Sound effect).

 What It Does (Yeh Kya Karta Hai?)

Aap apni personal diary ya qeemti cheezein daraz mein rakhte hain? Yeh system tab “Sota” (Sleep) rehta hai jab daraz band ho (Andhera). Jaise hi koi chor daraz kholta hai, Roshni (Light) andar aati hai, sensor jag jata hai aur Alarm bajna shuru ho jata hai!

Components Required

• Microcontroller: Arduino Uno
• LDR (Light Sensor)
• Buzzer

Wiring (Taarein Jorna)

1. Buzzer:

• Positive (+) → Pin 9
• Negative (-) → GND.

2. LRD

• LDR ki Pehli Taang: Seedha Arduino GND mein.
• LDR ki Doosri Taang: Seedha Arduino A0 mein.

Code

// Project 2: Smart Drawer (No Resistor Version)
// PlzPapa Robotic Kit

int ldrPin = A0;      
int buzzerPin = 9;    

// Logic Ulta hai: Roshni = Kam Value, Andhera = Zyada Value
// Roshni padne par value 200 se neeche chali jayegi
int threshold = 200; 

void setup() {
  pinMode(buzzerPin, OUTPUT);
  
  // YEH MAGIC LINE HAI: Is se bina resistor ke kaam chalega
  pinMode(ldrPin, INPUT_PULLUP); 
  
  Serial.begin(9600);
}

void loop() {
  int sensorValue = analogRead(ldrPin);
  
  Serial.print("Value: ");
  Serial.println(sensorValue); 

  // Agar value THRESHOLD se KAM hai (Matlab Roshni hai -> Drawer Khula hai)
  if (sensorValue < threshold) {
    digitalWrite(buzzerPin, HIGH); // Alarm Bajao
    delay(100);
    digitalWrite(buzzerPin, LOW);
    delay(100);
  } else {
    // Andhera hai (Drawer Band hai)
    digitalWrite(buzzerPin, LOW); 
  }
}