var toolbox_servo = {
   "kind": "categoryToolbox",
   "contents": [{
	  "kind": "category",
	  "name": "%{BKY_CAT_SERVO}",
		"toolboxitemid": "SERVO",
		"levels": "1,2,3",
		"level": "1",
	  "categorystyle": "servo_category",
		"cssConfig": {
		  "icon": "customIcon fas fa-robot"
		},
	  "contents": [{
		 "kind": "block",
		 "type": "servo_move",
		 "value": {
			"kind": "category",
			"name": "DEGREE",
			"shadow": {
			   "field": {
				  "kind": "category",
				  "name": "NUM",
				  "text": "90"
			   },
				  "type": "math_number"
			   }
			}
		 }, {
			"kind": "block",
			"type": "servo_read_degrees"
		 }
	  ]
   }]
};