diff --git a/simpleExpression_blocks.js b/simpleExpression_blocks.js
index d25af66..c523bc3 100644
--- a/simpleExpression_blocks.js
+++ b/simpleExpression_blocks.js
@@ -1,6 +1,21 @@
 Facilino.LANG_COLOUR_SCREEN = '#ACCE42';
 Facilino.LANG_COLOUR_SCREEN_LEDSTRIP = '#8EAC32';
 
+Facilino.hexToRgb = function(hex) {
+				// Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
+				var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
+				hex = hex.replace(shorthandRegex, function(m, r, g, b) {
+					return r + r + g + g + b + b;
+				});
+
+				var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
+				return result ? {
+					r: parseInt(result[1], 16),
+					g: parseInt(result[2], 16),
+					b: parseInt(result[3], 16)
+				} : null;
+			};
+
 Blockly.Blocks['show_mouth'] = {
     category: Facilino.locales.getKey('LANG_CATEGORY_SCREEN'),
     subcategory: Facilino.locales.getKey('LANG_SUBCATERGORY_WS2812'),