Lesson 35 Distance Detection by UltrasonicΒΆ

Introduction

The ultrasonic sensor uses sound to accurately detect objects and measure distances. It sends out ultrasonic waves and converts them into electronic signals.

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Components

  • 1 * SunFounder Uno board

  • 1 * USB data cable

  • 1 * Ultrasonic sensor

  • 1 * I2C LCD1602

  • 2 * 4-Pin anti-reverse cable

  • 1 * Dupont wire (F to F)

Principle

The sensor works by sending a sound wave out and calculating the time it takes for the sound wave to get back to the ultrasonic sensor. By doing this, it can tell us how far away objects are relative to the ultrasonic sensor.

Experimental Procedures

Step 1: Build the circuit

The wiring between the ultrasonic sensor and SunFounder Uno board:

Ultrasonic Sensor

SunFounder Uno

VCC

5V

Trig

2

Echo

3

GND

GND
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Step 2: Open the code file

Step 3: Select correct Board and Port

Step 4: Upload the sketch to the SunFounder Uno board

Code

Now, move a piece of paper close to the sensor or remove it farther. You can see the value displayed on the LCD changes accordingly; it indicates the distance between the paper and the ultrasonic sensor.

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