Joy-It RB-LCD-16x2 Manual

Joy-It Legetøj RB-LCD-16x2

Læs gratis den danske manual til Joy-It RB-LCD-16x2 (15 sider) i kategorien Legetøj. Denne vejledning er vurderet som hjælpsom af 13 personer og har en gennemsnitlig bedømmelse på 4.8 stjerner ud af 7 anmeldelser. Har du et spørgsmål om Joy-It RB-LCD-16x2, eller vil du spørge andre brugere om produktet?

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Side 1/15

Beginner’s Guide

to the

PI LCD

Part 4: Graphics

, W8BH

1) INTRODUCTION

In the first three parts of this series, we learned how to display text and simple graphics on

the LCD board (available from mypishop.com). It’s time to kick it up a notch, and create a

suite of useful graphics functions. We’ll even create a large-digit clock. You may have

purchased either a 16x2 or a 20x4 display with your kit. In this write-up I’ll be using the

20x4 display. When it comes to graphics, bigger is better!

2) SIMPLE HORIZONTAL BAR GRAPHS

An important requirement for creating detailed graphics is that the display device is dot-

addressable. In other words, each display pixel can be individually addressed and

programmed, separate from its neighbors. Sadly, our HD44780 controller does not give us

a dot-addressable LCD display. We get only pre-determined characters, plus 8 characters

of our own design. How can we possibly do artwork on that?

Well, we can’t. Go ahead, prove me wrong. Detailed graphics with this LCD module are

devilishly hard to do. But that doesn’t mean we can’t create useful, simpler graphics. Bar

graphs, for example.

First, consider a single, horizontal

bar graph. Here is our 20x4

display, with a horizontal bar that is

12 characters wide. If we need to

display data that over a small

integer range, like 0-15, we can do it by repeating the solid block (0xFF) character for the

desired length. You might code it like this:

Produkt Specifikationer

Mærke:	Joy-It
Kategori:	Legetøj
Model:	RB-LCD-16x2

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