From the "Introduction" of the bookWow! Uncle, that's a beautiful light !?It can output different colors with just one! Amazing!"Amazing, isn't it? This is called an RGB LED."Huh, I saw it for the first time!But what are "LEDs"?"It may still be difficult for you, so let's call it 'a pebble that emits light'."Wow, it's strange that light comes out of a stone !?"It's certainly strange! But there are many ways to use it!"“For example, when you start making software for a microcomputer, if there is nothing, you have no idea if it is working or not, right?”You mean we can't look inside the microcomputer!"If you put that 'light-emitting pebble' in the path of the software, you'll know it will shine every time it passes, right?"It's true! "It's like a sewer lid that rattles every time we pass through it!""Exactly! And the pebbles make out some different colors, so they have even more useful ways!"How do you use it?"For example, let's say you have a toy remote control buggy car that movement got worse, and you want to know the battery is low or which wheel is hard to move.""At that time, wouldn't it be convenient if the color of the 'pebbles' attached to various parts of the buggy could tell us the status without moving our eyes to the monitor?"That's easy to understand!" It is important to keep your eyes on the buggy!""This means that when you're monitoring something, you can monitor it without taking your eyes off the target!"I agree!“In a large factory where various devices are in operation, they watch the whole thing in a monitor room. Let's say that "color-changing pebbles" attached to the panel tell us the state without having to look at the many instruments. And if they check the gauges that have changed to the color of 'Caution' first, it'll be more efficient, and they'll be able to quickly prevent them before things become serious."Really!"What do you want to use it for?"What can I use it for?Well, when someone comes to the front door and if we know whether it's a scary adult, a man, a woman, a child, or someone with luggage, we can decide which member of the family will open the door. I want to use pebbles that change color for it."It's practical so much! I'm looking forward to your future! Do your best!"--------Table of contentsIntroduction[1] Overview[2] String display on LED screen (1) Description (2) Photos (3) Flowchart (4) Program[3] 16 characters x 2 lines display (1) Description (2) Circuit diagram (3) Photos (4) Flowchart (5) Program[4] 20 characters x 4 lines display (1) Description (2) Circuit diagram (3) Photos (4) Flowchart (5) Program[5] Ring LED Example 1 (1) Description (2) Circuit diagram (3) Photos (4) Figure 8 pattern (5) Program[6] Ring LED Example 2 (1) Top and bottom split pattern (2) Photos (3) Program[7] 7-segment display (1) Description (2) Circuit diagram (3) Photos (4) Flowchart (5) Program[8] OLED (1) Creation of bit pattern (2) Display on OLED device (3) Grouping (4) Circuit diagram (5) Photos (6) Flowchart (7) Program[9] RGB LED (1) Description (2) Circuit diagram (3) Photos (4) Flowchart (5) Program[10] Postscript

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