====== 1 - How to choose the default card to Arduino MEGA ====== You have to edit the file: /generators/arduino/blocklyduino.js and modify the // line 93: // '' profile["default"] = profile["arduino_uno"]; '' changing ** arduino_uno ** by ** arduino_mega. ** ====== 2 - How to choose the default blocks categories ====== You have to modify the file '' /utils/blocklyDuino.js '' at // line 479. // You can find the list of blocks categories at '' LoadIds = '' line: // set the default toolbox if none in session if (loadIds === undefined || loadIds === "") { loadIds = "CAT_LOGIC,CAT_LOOPS,CAT_VARIABLES,CAT_FUNCTIONS,CAT_MATH,CAT_TEXT,CAT_ARDUINO,CAT_TECHNOZONE"; window.sessionStorage.toolboxids = loadIds; } You can find the categories list name to write at line ** LoadIds ** in the file '' index.html '' starting // line 246 // in '' "toolboxes definitions" '' .