[SOLVED] 7 Segment driver MAX7219 : handling the dot on floating numbers

Hi - yes, it could definitely be tweaked. I guess you'd want 1.234 to effectively put the dot on the 1 digit?

Can you try adding this code after you have initialised the MAX7219 and trying again?

disp.set = function(val) {
  spi.write([0x9,0xff],cs); // decode all as numbers
  var map = "0123456789-EHLP ";
  var a = new Array(8);
  a.fill(15); // all off
  val = val.toString();
  var hadDot = false;
  var j = 7;
  for (var i=val.length-1;i>=0;i--) {
    if (val[i]!=".") {
      if (j>=0) 
        a[j--] = map.indexOf(val[i]) | (hadDot?128:0);
      hadDot = false;
    } else hadDot = true;
  }
  for (i=0;i<8;i++)
    spi.write([8-i,a[i]],cs);
  spi.write([0x0c,1],cs); // no shutdown
};