MAX7219 with Matrix Leds

[espruino-discuss2]

Posted at 2014-03-11 by andres.santos

Hello guys, I recently bought from ebay two Matrix Leds based on the Max7219, when I connect them to the espruino it powers everything up and then using the web IDE I send this code to the espruino:

SPI2.setup({mosi:B15, sck:B13});
var disp = require("MAX7219").connect(SPI2,B14);


setTimeout(function() {
  disp.raw([1,2,4,8,16,32,64,128]); // you can set the LEDs directly
}, 1000);

setTimeout(function() {
  var n = 0;
  setInterval(function() {
    disp.set(n++); // it can display integers
    disp.intensity(0.5+0.5*Math.sin(n*0.2)); // you set set intensity
  }, 100);
}, 2000);

But nothing happens, any idea?

[gfwilliams]

Posted at 2014-03-11 by @gfwilliams

Does it just hang without showing a > prompt on the left hand side?

[espruino-discuss2]

Posted at 2014-03-11 by andres.santos

well nope, this is all it shows

_____                 _ 
|   __|___ ___ ___ _ _|_|___ ___ 
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v56 Copyright 2014 G.Williams
>echo(0);
=undefined
Erasing Flash.....................
Programming 36000 Bytes.......................................
Checking...
Done!
>reset();
=undefined

greetings

[espruino-discuss2]

Posted at 2014-03-12 by andres.santos

so I tested the same matrix with the arduino and looks ok, does it mean I nead the sd card? or what is the difference of using the SD card?

[gfwilliams]

Posted at 2014-03-12 by @gfwilliams

No, you don't need the SD card for that.

The code you pasted isn't exactly what you sent over, because somewhere there's a save() command and a reset() command?

What happens if you put exactly what you wrote into the right-hand side of the Web IDE and click 'Send to Espruino'? I've just tried it and it works with a MAX7219 here.

[espruino-discuss2]

Posted at 2014-03-13 by andres.santos

oh yes, I was testing both, with and without the save(), but in both cases behaves the same, I even upgraded the firmware

greetings

[espruino-discuss2]

Posted at 2014-04-10 by MrTimcakes

Same happens to me. When i powerup the Espruino the matrix takes a second or so to startup, then every led turns on. Nothing happens after that, not even disp.off()

[gfwilliams]

Posted at 2014-04-10 by @gfwilliams

Are you sure you've connected the wires up exactly as in http://www.espruino.com/MAX7219

And that you've got the right end (the DIN end, not the DOUT end)

I've just tried again with 1v60, and it still works perfectly.

[espruino-discuss2]

Posted at 2014-04-10 by MrTimcakes

Huh, just tried my other module and it worked, so it was most likely the wiring. But i'm sure i checked that yesterday. Thanks Gordon you're always so quick to reply.

EDIT: both modules work