📌 Week 2 Assignment – IR Sensor with Arduino UNO

🎯 Objective

To interface an IR sensor with Arduino UNO and detect the presence of an object using digital input.

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🧰 Components Required

• Arduino UNO
• IR Sensor Module
• Jumper Wires
• USB Cable
• Laptop (for Arduino IDE)

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🔌 Circuit Connections

• VCC → 5V (Arduino UNO)
• GND → GND (Arduino UNO)
• OUT → Digital Pin 2 (Arduino UNO)

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💻 Arduino Code

int sensorPin = 2;

void setup() {
  pinMode(sensorPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  int sensorValue = digitalRead(sensorPin);

  if (sensorValue == 0) {
    Serial.println("Object Detected");
  } else {
    Serial.println("No Object");
  }

  delay(500);
}

📊 Working Principle

• The IR sensor emits infrared light.
• When an object comes in front, the light reflects back.
• The sensor detects this reflection and outputs a LOW signal (0).
• Arduino reads this signal and prints "Object Detected" in the Serial Monitor.
• If no object is present, it prints "No Object".

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🖥️ Output

• Object Detected → when object is near.
• No Object → when no object is present.

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✅ Result

Successfully interfaced IR sensor with Arduino UNO and detected object presence using digital input.