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Clickable Color Blocks

We’ve already tried drawing a clickable dot to control the LED, so let’s take it a step further and draw 3 colored squares to adjust the RGB colors!

../_images/colorful_square.png

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name

ITEMS IN THIS KIT

LINK

Raphael Kit

337

Raphael Kit

You can also buy them separately from the links below.

COMPONENT INTRODUCTION

PURCHASE LINK

GPIO Extension Board

BUY

Breadboard

BUY

Jumper Wires

BUY

RGB LED

BUY

Wiring

../_images/image612.png

Sketch

import processing.io.*; // use the GPIO library

int[] pins = { 17, 18, 27 };

void setup() {
    for (int i = 0; i < pins.length; i++) {
        GPIO.pinMode(pins[i], GPIO.OUTPUT);
    }
    size(300, 100);
    background(255);
}

void draw() {
    fill(255, 0, 0);
    rect(0, 0, width/3, height);

    fill(0,255,0);
    rect(width/3, 0, 2*width/3, height);

    fill(0,0,255);
    rect(2*width/3, 0, width, height);
}

void mouseClicked() {
    for (int i = 0; i < pins.length; i++) {
        GPIO.digitalWrite(pins[i],GPIO.LOW);
    }
    if (mouseX<width/3){
        GPIO.digitalWrite(pins[0],GPIO.HIGH);
    }else if (mouseX>width/3&&mouseX<2*width/3){
        GPIO.digitalWrite(pins[1],GPIO.HIGH);
    }else if (mouseX>2*width/3){
        GPIO.digitalWrite(pins[2],GPIO.HIGH);
    }
}

How it works?

This project has a lot in common with Clickable Dot, except that it refines the conditions for determining mouse click event.

First draw three color blocks in draw(), then get which color block was clicked based on the value of mouseX (the X-axis coordinate of the mouse), and finally make RGB light up the corresponding color.

What more?

Based on the addition of light, we can make RGB LED display seven colors - adding red to green produces yellow; adding all three primary colors together produces white. Now you can try it out for yourself.