Alfazeta FlipDot 7x7 dots display

[espruino-discuss3]

Posted at 2017-06-20 by Mrbbp

with the fabulous help of @gfwilliams
there is an example code for working with alfazeta 7x7 flipdots panel (around 80€ + shipping)

/* 5 wires used on pin A8, B7, B6 + a RS485 module
B6 -> DI from RS485 module
B7 -> DE, RE pins
A8 -> RO pin
+ GND
+ 5v
*/
var TX_ENABLE_PIN = A8;
var TX_PIN = B6;
var cpt=0;

var g = Graphics.createArrayBuffer(8,7,1);
var text = "I love Espruino";

function sendData() {
  if (cpt < -g.stringWidth(text))
    cpt = 7;
  g = Graphics.createArrayBuffer(8,7,1);
  g.setFontDennis8();
  g.drawString(text,cpt,0);
  Serial1.write([0x80,0x87,0xFF],g.buffer,[0x8F]);
  cpt--;
}

function onInit() {
  require("FontDennis8").add(Graphics);
  Serial1.setup(9600,{tx:TX_PIN});
  digitalWrite(TX_ENABLE_PIN, 1);
  setInterval(sendData, 150);
}

and a video demo of code

[gfwilliams]

Posted at 2017-06-21 by @gfwilliams

Great! Thanks for posting the code! Nice to see it actually ends up being really simple :)