Instrukcja obs艂ugi Joy-It RB-LCD-16x2
Przeczytaj poni偶ej 馃摉 instrukcj臋 obs艂ugi w j臋zyku polskim dla Joy-It RB-LCD-16x2 (15 stron) w kategorii Zabawki. Ta instrukcja by艂a pomocna dla 7 os贸b i zosta艂a oceniona przez 4 u偶ytkownik贸w na 艣rednio 4.8 gwiazdek
Strona 1/15
Beginner鈥檚 Guide
to the
PI LCD
Part 4: Graphics
, W8BH
1) INTRODUCTION
In the 顙噐st three parts of this series, we learned how to display text and simple graphics on
the LCD board (available from mypishop.com). It鈥檚 time to kick it up a notch, and create a
suite of useful graphics functions. We鈥檒l 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鈥檒l 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鈥檛. Go ahead, prove me wrong. Detailed graphics with this LCD module are
devilishly hard to do. But that doesn鈥檛 mean we can鈥檛 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:
Specyfikacje produktu
| Marka: | Joy-It |
| Kategoria: | Zabawki |
| Model: | RB-LCD-16x2 |
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