Using an LCD on the Edison

Contributors: Shawn Hymel

Example Program: JavaScript

If you would like to write a Node.JS program that uses the ILI9341 module, you can do that, too!

cd ~
vi ili9341.js

Press ‘i’ to type text. Copy and paste the code below into vi (if you are using an SSH client like PuTTY, simply right-click in the window to paste).

language:javascript
var ili9341 = require('jsupm_ili9341');

// Pins (Edison)
// CS_LCD   GP44 (MRAA 31)
// CS_SD    GP43 (MRAA 38) unused
// DC       GP12 (MRAA 20)
// RESEST   GP13 (MRAA 14)
var lcd = new ili9341.ILI9341(31, 38, 20, 14);

// Fill the screen with a solid color
lcd.fillScreen(lcd.color565(0, 40, 16));

// Draw some shapes
lcd.drawFastVLine(10, 10, 100, ili9341.ILI9341_RED);
lcd.drawFastHLine(20, 10, 50, ili9341.ILI9341_CYAN);
lcd.drawLine(160, 30, 200, 60, ili9341.ILI9341_GREEN);
lcd.fillRect(20, 30, 75, 60, ili9341.ILI9341_ORANGE);
lcd.drawCircle(70, 50, 20, ili9341.ILI9341_PURPLE);
lcd.fillCircle(120, 50, 20, ili9341.ILI9341_PURPLE);
lcd.drawTriangle(50, 100, 10, 140, 90, 140, ili9341.ILI9341_YELLOW);
lcd.fillTriangle(150, 100, 110, 140, 190, 140, ili9341.ILI9341_YELLOW);
lcd.drawRoundRect(20, 150, 50, 30, 10, ili9341.ILI9341_RED);
lcd.drawRoundRect(130, 150, 50, 30, 10, ili9341.ILI9341_RED);
lcd.fillRoundRect(75, 150, 50, 30, 10, ili9341.ILI9341_RED);

// Write some text
lcd.setCursor(0, 200);
lcd.setTextColor(ili9341.ILI9341_LIGHTGREY);
lcd.setTextWrap(true);
lcd.setTextSize(1);
lcd.print("Text 1\n");
lcd.setTextSize(2);
lcd.print("Text 2\n");
lcd.setTextSize(3);
lcd.print("Text 3\n");
lcd.setTextSize(4);
lcd.print("Text 4\n");

// Test screen rotation
function rotateScreen(r) {
    lcd.setRotation(r);
    lcd.fillRect(0, 0, 5, 5, ili9341.ILI9341_WHITE);
    if (r < 4) {
        r++;
        setTimeout(function() { rotateScreen(r); }, 1000);
    }
}
rotateScreen(0);

// Invert colors, wait, then revert back
setTimeout(function() { lcd.invertDisplay(true); }, 4000);
setTimeout(function() { lcd.invertDisplay(false); }, 6000);

Save and exit (‘esc’, type ‘:wq’, and press ‘enter’). Append the UPM modules location to our Node PATH:

export NODE_PATH=$NODE_PATH:/usr/local/lib/node_modules/

Run the program:

node ili9341.js

The screen will fill with a color and draw some basic shapes!