User Manual

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Lesson 22 LCD Display
Overview
In this lesson, you will learn how to wire up and use an alphanumeric LCD display.
The display has an LED backlight and can display two rows with up to 16 characters
on each row. You can see the rectangles for each character on the display and the
pixels that make up each character. The display is just white on blue and is intended
for showing text.
In this lesson, we will run the Arduino example program for the LCD library, but in
the next lesson, we will get our display to show the temperature, using sensors.
Component Required:
(1) x Elegoo Mega2560 R3
(1) x LCD1602 module
(1) x Potentiometer (10k)
(1) x 830 tie-points Breadboard
(16) x M-M wires (Male to Male jumper wires)
Component Introduction
LCD1602
Introduction to the pins of LCD1602:
VSS: A pin that connects to ground
VDD: A pin that connects to a +5V power supply
VO: A pin that adjust the contrast of LCD1602
RS: A register select pin that controls where in the LCD’s memory you are writing data
to. You can select either the data register, which holds what goes on the screen, or an
instruction register, which is where the LCD’s controller looks for instructions on what
to do next.
R/W: A Read/Write pin that selects reading mode or writing mode
E: An enabling pin that, when supplied with low-level energy, causes the LDC module
to execute relevant instructions.
D0-D7：Pins that read and write data
A and K: Pins that control the LED backlight