Sparkfun 7 segment display: turning decimals on and off

Code that I threw together to get decimal places to work. It looks a bit rough, but it seems to work.

function s7s (sensor, theAddress) {
  this.displayFor = sensor;
  this.address = theAddress;
  this.displayTable = {
    "Clear" : 0x76,
    "dp"    : {
      "cmd" : 0x77,
      "location"   : [
          0b00000001, //Digit 0
          0b00000010, //Digit 1
          0b00000100, //Digit 2
          0b00001000  //Digit 3
      ]
    }
  };
}

setInterval(function (e) {
  ph.getSensorResult(function(value) {
    var toChar = "";
    var a = phDisplay.address;
    var clr = phDisplay.displayTable.Clear; //Display clear command
    var dpc = phDisplay.displayTable.dp.cmd; //Decimal point command
    var dplo = phDisplay.displayTable.dp.location; //Decimal point location map

    var i;

    I2C1.writeTo(a, clr); //Clear display

    if(value[0] === 1) {
      for(i=0; i<value.length; i++) {
        if (value[i] !== 1 && value[i] !== 0) {
          var c = String.fromCharCode(value[i]);

          if (c != '.') {
            toChar += c;
          }
          if (c == '.') {
            var n = i - 2;

            I2C1.writeTo(a, dpc);
            I2C1.writeTo(a, dplo[n]);
          }
          if (i == (value.length - 2)) {
            console.log(toChar);
            I2C1.writeTo(a, toChar);
            toChar="";
          }
        }
      }
    }
  });
}, 2000);