Document

obniz Hardware and cloud specifications.

MatrixLED_MAX7219

Dot matrix LED. driver: MAX7219.

http://akizukidenshi.com/catalog/g/gM-09984/

wired(obniz, { clk, cs, din, gnd, vcc});

  1. vcc: power supply
  2. gnd: gnd.
  3. din: spi MOSI pin.
  4. cs: chip select

// Javascript Example
const matrix = obniz.wired("MatrixLED_MAX7219", { clk:0, cs:1, din:2, gnd:3, vcc:4});

init(width, height)

initialize module.
if one module has 8*8 led and two modules are connected then

// Javascript Example
const matrix = obniz.wired("MatrixLED_MAX7219",  { clk:0, cs:1, din:2, gnd:3, vcc:4});
matrix.init(8*2, 8);

brightness(value)

value: 0 to 15;

// Javascript Example
const matrix = obniz.wired("MatrixLED_MAX7219", { clk:0, cs:1, din:2, gnd:3, vcc:4});
matrix.init(8*2, 8);
matrix.brightness(7);

draw(ctx)

In html5, Canvas is avaiable to draw.
pass canpas context to this function to show it on matrix

obniz.util.createCanvasContext() will create Canvas DOM to body.
See more detail on obniz util document's.

// Javascript Example
const matrix = obniz.wired("MatrixLED_MAX7219", { clk:0, cs:1, din:2, gnd:3, vcc:4});
matrix.init(8*4, 8);
matrix.brightness(7);

const ctx = obniz.util.createCanvasContext(matrix.width, matrix.height);
ctx.fillStyle = "black";
ctx.fillRect(0, 0, matrix.width, matrix.height);
ctx.fillStyle = "white";
ctx.font = "9px sans-serif";
ctx.fillText('Hello World', 0, 7);

matrix.draw(ctx);

clear()

clear all.

// Javascript Example
const matrix = obniz.wired("MatrixLED_MAX7219",  { clk:0, cs:1, din:2, gnd:3, vcc:4});
matrix.init(8*4, 8);
matrix.clear();

test()

test all unit.
It will show last image.

// Javascript Example
const matrix = obniz.wired("MatrixLED_MAX7219", { clk:0, cs:1, din:2, gnd:3, vcc:4});
matrix.init(8*4, 8);
matrix.test();


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