text: Blockly.Blocks['led_light'] = {
    init: function() {
      this.appendDummyInput()
          .appendField("turn led on for")
          .appendField(new Blockly.FieldNumber(1, 0, 10), "high")
          .appendField("sec and off for")
          .appendField(new Blockly.FieldNumber(2, 0, 10), "low")
          .appendField("seconds");
      this.setColour(230);
   this.setTooltip("");
   this.setHelpUrl("");
    }
  };
  
  
  Blockly.JavaScript['led_light'] = function(block) {
    var number_high = block.getFieldValue('high');
    var number_low = block.getFieldValue('low');
    var code = {high : number_high, low : number_low};
    return JSON.stringify(code);
  };
  