espruino-adafruit-led-backpack

This is a driver that closely mirrors the Adafruit's LED Backpack Library.

This package currently works with Adafruit 8x8 and 16x8 Single Color LED Backpacks.

• 8x8 0.8" (872, 871, 870)
• 8x8 1.2" (1049, 1052, 1051, 1050, 1614, 1632, 1857, 1854, 1855, 1856)
• 16x8 1.2" (2044, 2038, 2037, 2040, 2041, 2039, 2043, 2042, 2035, 2036, 2052, 2054)
• 16x8 LED Matrix Driver Backpack (1427)

This library was tested on on the Small 1.2" 8x8 Ultra Bright Square White LED Matrix + Backpack, PRODUCT ID: 1857 and on the 16x8 1.2" Ultra Bright Square Green LED Matrix + Backpack.

This doesn't work with the 7-Segment backpacks.

Example Code for 8 x 8 Matrix

To use this library in the Espruino Web IDE you need to go to Settings > Communications > Check 'Load modules from NPM (BETA)'.

Here's some example code that mirrors the Adafruit's example code for the 8x8 Matrix example code for Arduino.

var Matrix8x8 = require("espruino-adafruit-led-backpack").Matrix8x8;

//Clock: B6 Data: B7 Device Address: 0x70, Brightness: 0-15
var matrix = new Matrix8x8({scl:B6, sda:B7, address:0x70, brightness: 0});

//Squint a little and you can see the faces!

// :)
var smileBmp = [
    0b00111100,
    0b01000010,
    0b10100101,
    0b10000001,
    0b10100101,
    0b10011001,
    0b01000010,
    0b00111100
],
//:|
    neutralBmp = [
    0b00111100,
    0b01000010,
    0b10100101,
    0b10000001,
    0b10111101,
    0b10000001,
    0b01000010,
    0b00111100
],
//:(
  frownBmp = [
    0b00111100,
    0b01000010,
    0b10100101,
    0b10000001,
    0b10011001,
    0b10100101,
    0b01000010,
    0b00111100
];

//Hacky scynchronous timeout :)
function delay(time) {
  var i = 0;
  while(i < time * 10) {  i++; }
}

//Run Example Code
function testDisplay() {
  //Draws Smiley Face
  matrix.clear();
  matrix.drawBitmap(smileBmp);
  matrix.writeDisplay();
  delay(500);

  //Draws Neutral Face
  matrix.clear();
  matrix.drawBitmap(neutralBmp);
  matrix.writeDisplay();
  delay(500);

  //Draws Frowny Face
  matrix.clear();
  matrix.drawBitmap(frownBmp);
  matrix.writeDisplay();
  delay(500);

  //Draws a pixel at the top left x = 0, y = 0
  matrix.clear();
  matrix.drawPixel(0, 0);
  matrix.writeDisplay();
  delay(500);

  //Draws a diagonal line between x1 = 0, y1 = 0 and x2 = 7, y2 = 7
  matrix.clear();
  matrix.drawLine(0,0, 7,7);
  matrix.writeDisplay();
  delay(500);

  //Draws a rectangle at x = 0, y = 0 and a witdth = 8 and height = 8
  matrix.clear();
  matrix.drawRect(0,0, 8,8);
  matrix.writeDisplay();
  delay(500);

  //Draws the same rectangle as abover with a filled in rectangle 4 by 4 starting at x = 2, y = 2
  matrix.clear();
  matrix.drawRect(0,0, 8,8);
  matrix.fillRect(2,2, 4,4);
  matrix.writeDisplay();
  delay(500);
}

testDisplay();

Here's a gif of the above code in action:

Example Code for 16x8 Matrix

var Matrix16x8 = require("espruino-adafruit-led-backpack").Matrix16x8;

var matrix = new Matrix16x8({scl:B6, sda:B7, address:0x70, brightness: 0});

// draw smile and frown side by side
var smileFrownBmp = [
    0b00111100, 0b00111100,
    0b01000010, 0b01000010,
    0b10100101, 0b10100101,
    0b10000001, 0b10000001,
    0b10100101, 0b10011001,
    0b10011001, 0b10100101,
    0b01000010, 0b01000010,
    0b00111100, 0b00111100
];

matrix.clear();
matrix.drawBitmap(smileFrownBmp);
matrix.writeDisplay();

The functions drawLine, drawPixel, drawRect and fillRect work the same as for the 8x8 Matrix except you can address up to 16 pixels on the x axis:

// Draws a diagonal line between x1 = 3, y1 = 3 and x2 = 15, y2 = 7
matrix.drawLine(3, 3, 15, 7);

Todos - A.K.A. Please Help

• [ ] Finish Parity for 8 x 8 Display
  • [ ] drawCircle()
  • [ ] setTextWrap()
  • [ ] setTextColor()
  • [ ] setCursor()
  • [ ] print()
  • [ ] setRotation()
• [ ] Implement 7 Segment Display