Obstacle detection system with Arduino

Purpose of this project:

In this project an obstacle detection system will be built with Arduino. This system mainly uses an ultrasound sensor, buzzer and LED.

When the ultrasonic sensor detects an obstacle at a distance < 3cm, the Arduino orders the buzzer to ring and the red LED to light up.

Necessary components

• Arduino UNO
• ultrasonic sensor (HC-SR04)
• buzzer
• 1 resistance 220Ω
• 1 red LED
• connecting wires

Mounting

To make the assembly, we can connect :

For LED and buzzer:

• the terminals (+) of the red LED and buzzer to the digital pin 1 of  Arduino.
• the (-) terminals of the red LED and buzzer at the GND pin of  Arduino.

For HC-SR04 sensor:

• TRIG pin to pin 2 of Arduino
• Echo pin tp pin 3 of Arduino.
• VCC pin to 3.3V of Arduino
• GND pin to GND of Arduino

or the LCD display:

• the SDA pin at the Arduino analog pin A4.

• the SCL pin at the Arduino analog pin A5.

• the VCC pin at the Arduino 5v pin.

• the GND pin at the Arduino GND pin

Program

The Obstacle Detection System program is as follows: