Flowing LED Lights

Here's a simple but interesting experiment using LEDs to create flowing LED lights. The purpose of this experiment is to turn eight LEDs on.

Each of the LEDs are connected to pin 2-pin 9, and when it is set to a high level, the corresponding LED will light up, and you will see LED lights flowing by controlling the time.

LCD1602

This lesson demonstrates how to use a LCD1602 to display characters and strings. The 1602 character-type liquid crystal display is a kind of dot matrix module for displaying letters, numbers, and characters.

It is composed of 5x7 or 5x11 dot matrix positions, each displaying a character.

Between two characters there is a dot pitch and between lines there is a space, thus separating the characters and lines. The number 1602 means there are two rows and 16 characters per row on the display.

Ultrasonic

During reversing, you will see the distance between your car and the obstacles in front of it to avoid a collision. The distance is detected by an ultrasonic sensor. Here you will learn how ultrasonic waves detect distance.