Ultrasonic Distance Sensor with Buzzer and LED Alert

This project uses an ultrasonic sensor (HC-SR04) to measure the distance of an object and triggers a buzzer and LED when the object is too close (within 10 cm). It’s a simple safety distance detection system.

Components Needed:

• Arduino Board (e.g., Arduino Uno)
• HC-SR04 Ultrasonic Distance Sensor
• Buzzer
• LED
• Jumper Wires
• Breadboard (optional)

Circuit Diagram:

• HC-SR04 Ultrasonic Sensor:
  • Trig Pin → Pin 9
  • Echo Pin → Pin 10
  • VCC → 5V
  • GND → GND
• Buzzer:
  • Connect one pin to Pin 11 and the other to GND.
• LED:
  • Connect the long leg (anode) to Pin 13 and the short leg (cathode) to GND through a 220Ω resistor.