diff --git a/spaceapi/schema/sensors.json b/spaceapi/schema/sensors.json
--- a/spaceapi/schema/sensors.json
+++ b/spaceapi/schema/sensors.json
@@ -1,1 +1,543 @@
-{"people_now_present": {"required": ["value"], "type": "object", "properties": {"names": {"type": "array", "items": {"type": "string"}}, "location": {"type": "string"}, "description": {"type": "string"}, "value": {"type": "number"}, "name": {"type": "string"}}}, "wind": {"required": ["properties", "location"], "type": "object", "properties": {"location": {"type": "string"}, "description": {"type": "string"}, "properties": {"required": ["speed", "gust", "direction", "elevation"], "type": "object", "properties": {"speed": {"required": ["value", "unit"], "type": "object", "properties": {"unit": {"enum": ["m/s", "km/h", "kn"]}, "value": {"type": "number"}}}, "elevation": {"required": ["value", "unit"], "type": "object", "properties": {"unit": {"enum": ["m"]}, "value": {"type": "number"}}}, "direction": {"required": ["value", "unit"], "type": "object", "properties": {"unit": {"enum": ["\u00b0"]}, "value": {"type": "number"}}}, "gust": {"required": ["value", "unit"], "type": "object", "properties": {"unit": {"enum": ["m/s", "km/h", "kn"]}, "value": {"type": "number"}}}}}, "name": {"type": "string"}}}, "total_member_count": {"required": ["value"], "type": "object", "properties": {"location": {"type": "string"}, "description": {"type": "string"}, "value": {"type": "number"}, "name": {"type": "string"}}}, "barometer": {"required": ["value", "unit", "location"], "type": "object", "properties": {"description": {"type": "string"}, "location": {"type": "string"}, "unit": {"enum": ["hPA"]}, "value": {"type": "number"}, "name": {"type": "string"}}}, "humidity": {"required": ["value", "unit", "location"], "type": "object", "properties": {"description": {"type": "string"}, "location": {"type": "string"}, "unit": {"enum": ["%"]}, "value": {"type": "number"}, "name": {"type": "string"}}}, "account_balance": {"required": ["value", "unit"], "type": "object", "properties": {"description": {"type": "string"}, "location": {"type": "string"}, "unit": {"enum": ["BTC", "EUR", "USD", "GBP"]}, "value": {"type": "number"}, "name": {"type": "string"}}}, "radiation": {"beta": {"type": "array", "items": {"required": ["value", "unit"], "type": "object", "properties": {"description": {"type": "string"}, "dead_time": {"type": "number"}, "unit": {"enum": ["cpm", "r/h", "\u00b5Sv/h", "mSv/a", "\u00b5Sv/a"]}, "conversion_factor": {"type": "number"}, "location": {"type": "string"}, "value": {"type": "number"}, "name": {"type": "string"}}}}, "gamma": {"type": "array", "items": {"required": ["value", "unit"], "type": "object", "properties": {"description": {"type": "string"}, "dead_time": {"type": "number"}, "unit": {"enum": ["cpm", "r/h", "\u00b5Sv/h", "mSv/a", "\u00b5Sv/a"]}, "conversion_factor": {"type": "number"}, "location": {"type": "string"}, "value": {"type": "number"}, "name": {"type": "string"}}}}, "type": "object", "beta_gamma": {"type": "array", "items": {"required": ["value", "unit"], "type": "object", "properties": {"description": {"type": "string"}, "dead_time": {"type": "number"}, "unit": {"enum": ["cpm", "r/h", "\u00b5Sv/h", "mSv/a", "\u00b5Sv/a"]}, "conversion_factor": {"type": "number"}, "location": {"type": "string"}, "value": {"type": "number"}, "name": {"type": "string"}}}}, "alpha": {"type": "array", "items": {"required": ["value", "unit"], "type": "object", "properties": {"description": {"type": "string"}, "dead_time": {"type": "number"}, "unit": {"enum": ["cpm", "r/h", "\u00b5Sv/h", "mSv/a", "\u00b5Sv/a"]}, "conversion_factor": {"type": "number"}, "location": {"type": "string"}, "value": {"type": "number"}, "name": {"type": "string"}}}}}, "power_consumption": {"required": ["value", "unit", "location"], "type": "object", "properties": {"description": {"type": "string"}, "location": {"type": "string"}, "unit": {"enum": ["mW", "W", "VA"]}, "value": {"type": "number"}, "name": {"type": "string"}}}, "door_locked": {"required": ["value", "location"], "type": "object", "properties": {"location": {"type": "string"}, "description": {"type": "string"}, "value": {"type": "boolean"}, "name": {"type": "string"}}}, "temperature": {"required": ["value", "unit", "location"], "type": "object", "properties": {"description": {"type": "string"}, "location": {"type": "string"}, "unit": {"enum": ["\u00b0C", "\u00b0F", "K", "\u00b0De", "\u00b0N", "\u00b0R", "\u00b0R\u00e9", "\u00b0R\u00f8"]}, "value": {"type": "number"}, "name": {"type": "string"}}}, "beverage_supply": {"required": ["value", "unit"], "type": "object", "properties": {"description": {"type": "string"}, "location": {"type": "string"}, "unit": {"enum": ["btl", "crt"]}, "value": {"type": "number"}, "name": {"type": "string"}}}, "network_connections": {"required": ["value"], "type": "object", "properties": {"description": {"type": "string"}, "type": {"enum": ["wifi", "cable", "spacenet"]}, "location": {"type": "string"}, "machines": {"type": "array", "items": {"type": "object", "properties": {"mac": {"type": "string"}, "name": {"type": "string"}}}}, "value": {"type": "number"}, "name": {"type": "string"}}}}
\ No newline at end of file
+{
+   "account_balance" : {
+      "type" : "object",
+      "required" : [
+         "value",
+         "unit"
+      ],
+      "properties" : {
+         "value" : {
+            "type" : "number"
+         },
+         "name" : {
+            "type" : "string"
+         },
+         "location" : {
+            "type" : "string"
+         },
+         "unit" : {
+            "enum" : [
+               "BTC",
+               "EUR",
+               "USD",
+               "GBP"
+            ]
+         },
+         "description" : {
+            "type" : "string"
+         }
+      }
+   },
+   "people_now_present" : {
+      "properties" : {
+         "location" : {
+            "type" : "string"
+         },
+         "names" : {
+            "type" : "array",
+            "items" : {
+               "type" : "string"
+            }
+         },
+         "description" : {
+            "type" : "string"
+         },
+         "name" : {
+            "type" : "string"
+         },
+         "value" : {
+            "type" : "number"
+         }
+      },
+      "required" : [
+         "value"
+      ],
+      "type" : "object"
+   },
+   "temperature" : {
+      "properties" : {
+         "name" : {
+            "type" : "string"
+         },
+         "value" : {
+            "type" : "number"
+         },
+         "description" : {
+            "type" : "string"
+         },
+         "location" : {
+            "type" : "string"
+         },
+         "unit" : {
+            "enum" : [
+               "°C",
+               "°F",
+               "K",
+               "°De",
+               "°N",
+               "°R",
+               "°Ré",
+               "°Rø"
+            ]
+         }
+      },
+      "required" : [
+         "value",
+         "unit",
+         "location"
+      ],
+      "type" : "object"
+   },
+   "barometer" : {
+      "properties" : {
+         "name" : {
+            "type" : "string"
+         },
+         "value" : {
+            "type" : "number"
+         },
+         "unit" : {
+            "enum" : [
+               "hPA"
+            ]
+         },
+         "location" : {
+            "type" : "string"
+         },
+         "description" : {
+            "type" : "string"
+         }
+      },
+      "required" : [
+         "value",
+         "unit",
+         "location"
+      ],
+      "type" : "object"
+   },
+   "radiation" : {
+      "beta" : {
+         "type" : "array",
+         "items" : {
+            "properties" : {
+               "location" : {
+                  "type" : "string"
+               },
+               "unit" : {
+                  "enum" : [
+                     "cpm",
+                     "r/h",
+                     "µSv/h",
+                     "mSv/a",
+                     "µSv/a"
+                  ]
+               },
+               "description" : {
+                  "type" : "string"
+               },
+               "conversion_factor" : {
+                  "type" : "number"
+               },
+               "dead_time" : {
+                  "type" : "number"
+               },
+               "value" : {
+                  "type" : "number"
+               },
+               "name" : {
+                  "type" : "string"
+               }
+            },
+            "type" : "object",
+            "required" : [
+               "value",
+               "unit"
+            ]
+         }
+      },
+      "alpha" : {
+         "type" : "array",
+         "items" : {
+            "properties" : {
+               "unit" : {
+                  "enum" : [
+                     "cpm",
+                     "r/h",
+                     "µSv/h",
+                     "mSv/a",
+                     "µSv/a"
+                  ]
+               },
+               "location" : {
+                  "type" : "string"
+               },
+               "description" : {
+                  "type" : "string"
+               },
+               "dead_time" : {
+                  "type" : "number"
+               },
+               "conversion_factor" : {
+                  "type" : "number"
+               },
+               "name" : {
+                  "type" : "string"
+               },
+               "value" : {
+                  "type" : "number"
+               }
+            },
+            "type" : "object",
+            "required" : [
+               "value",
+               "unit"
+            ]
+         }
+      },
+      "gamma" : {
+         "items" : {
+            "type" : "object",
+            "required" : [
+               "value",
+               "unit"
+            ],
+            "properties" : {
+               "description" : {
+                  "type" : "string"
+               },
+               "conversion_factor" : {
+                  "type" : "number"
+               },
+               "dead_time" : {
+                  "type" : "number"
+               },
+               "unit" : {
+                  "enum" : [
+                     "cpm",
+                     "r/h",
+                     "µSv/h",
+                     "mSv/a",
+                     "µSv/a"
+                  ]
+               },
+               "location" : {
+                  "type" : "string"
+               },
+               "value" : {
+                  "type" : "number"
+               },
+               "name" : {
+                  "type" : "string"
+               }
+            }
+         },
+         "type" : "array"
+      },
+      "beta_gamma" : {
+         "items" : {
+            "properties" : {
+               "location" : {
+                  "type" : "string"
+               },
+               "unit" : {
+                  "enum" : [
+                     "cpm",
+                     "r/h",
+                     "µSv/h",
+                     "mSv/a",
+                     "µSv/a"
+                  ]
+               },
+               "dead_time" : {
+                  "type" : "number"
+               },
+               "conversion_factor" : {
+                  "type" : "number"
+               },
+               "description" : {
+                  "type" : "string"
+               },
+               "value" : {
+                  "type" : "number"
+               },
+               "name" : {
+                  "type" : "string"
+               }
+            },
+            "required" : [
+               "value",
+               "unit"
+            ],
+            "type" : "object"
+         },
+         "type" : "array"
+      },
+      "type" : "object"
+   },
+   "network_connections" : {
+      "required" : [
+         "value"
+      ],
+      "type" : "object",
+      "properties" : {
+         "machines" : {
+            "items" : {
+               "properties" : {
+                  "name" : {
+                     "type" : "string"
+                  },
+                  "mac" : {
+                     "type" : "string"
+                  }
+               },
+               "type" : "object"
+            },
+            "type" : "array"
+         },
+         "value" : {
+            "type" : "number"
+         },
+         "name" : {
+            "type" : "string"
+         },
+         "type" : {
+            "enum" : [
+               "wifi",
+               "cable",
+               "spacenet"
+            ]
+         },
+         "location" : {
+            "type" : "string"
+         },
+         "description" : {
+            "type" : "string"
+         }
+      }
+   },
+   "beverage_supply" : {
+      "required" : [
+         "value",
+         "unit"
+      ],
+      "type" : "object",
+      "properties" : {
+         "name" : {
+            "type" : "string"
+         },
+         "value" : {
+            "type" : "number"
+         },
+         "unit" : {
+            "enum" : [
+               "btl",
+               "crt"
+            ]
+         },
+         "location" : {
+            "type" : "string"
+         },
+         "description" : {
+            "type" : "string"
+         }
+      }
+   },
+   "door_locked" : {
+      "properties" : {
+         "description" : {
+            "type" : "string"
+         },
+         "location" : {
+            "type" : "string"
+         },
+         "value" : {
+            "type" : "boolean"
+         },
+         "name" : {
+            "type" : "string"
+         }
+      },
+      "type" : "object",
+      "required" : [
+         "value",
+         "location"
+      ]
+   },
+   "humidity" : {
+      "properties" : {
+         "name" : {
+            "type" : "string"
+         },
+         "value" : {
+            "type" : "number"
+         },
+         "unit" : {
+            "enum" : [
+               "%"
+            ]
+         },
+         "location" : {
+            "type" : "string"
+         },
+         "description" : {
+            "type" : "string"
+         }
+      },
+      "required" : [
+         "value",
+         "unit",
+         "location"
+      ],
+      "type" : "object"
+   },
+   "wind" : {
+      "properties" : {
+         "name" : {
+            "type" : "string"
+         },
+         "description" : {
+            "type" : "string"
+         },
+         "properties" : {
+            "type" : "object",
+            "required" : [
+               "speed",
+               "gust",
+               "direction",
+               "elevation"
+            ],
+            "properties" : {
+               "speed" : {
+                  "required" : [
+                     "value",
+                     "unit"
+                  ],
+                  "type" : "object",
+                  "properties" : {
+                     "unit" : {
+                        "enum" : [
+                           "m/s",
+                           "km/h",
+                           "kn"
+                        ]
+                     },
+                     "value" : {
+                        "type" : "number"
+                     }
+                  }
+               },
+               "direction" : {
+                  "type" : "object",
+                  "required" : [
+                     "value",
+                     "unit"
+                  ],
+                  "properties" : {
+                     "unit" : {
+                        "enum" : [
+                           "°"
+                        ]
+                     },
+                     "value" : {
+                        "type" : "number"
+                     }
+                  }
+               },
+               "gust" : {
+                  "required" : [
+                     "value",
+                     "unit"
+                  ],
+                  "type" : "object",
+                  "properties" : {
+                     "value" : {
+                        "type" : "number"
+                     },
+                     "unit" : {
+                        "enum" : [
+                           "m/s",
+                           "km/h",
+                           "kn"
+                        ]
+                     }
+                  }
+               },
+               "elevation" : {
+                  "type" : "object",
+                  "required" : [
+                     "value",
+                     "unit"
+                  ],
+                  "properties" : {
+                     "unit" : {
+                        "enum" : [
+                           "m"
+                        ]
+                     },
+                     "value" : {
+                        "type" : "number"
+                     }
+                  }
+               }
+            }
+         },
+         "location" : {
+            "type" : "string"
+         }
+      },
+      "type" : "object",
+      "required" : [
+         "properties",
+         "location"
+      ]
+   },
+   "total_member_count" : {
+      "properties" : {
+         "description" : {
+            "type" : "string"
+         },
+         "location" : {
+            "type" : "string"
+         },
+         "value" : {
+            "type" : "number"
+         },
+         "name" : {
+            "type" : "string"
+         }
+      },
+      "required" : [
+         "value"
+      ],
+      "type" : "object"
+   },
+   "power_consumption" : {
+      "required" : [
+         "value",
+         "unit",
+         "location"
+      ],
+      "type" : "object",
+      "properties" : {
+         "name" : {
+            "type" : "string"
+         },
+         "value" : {
+            "type" : "number"
+         },
+         "location" : {
+            "type" : "string"
+         },
+         "unit" : {
+            "enum" : [
+               "mW",
+               "W",
+               "VA"
+            ]
+         },
+         "description" : {
+            "type" : "string"
+         }
+      }
+   }
+}
diff --git a/spaceapi/sensors.py b/spaceapi/sensors.py
--- a/spaceapi/sensors.py
+++ b/spaceapi/sensors.py
@@ -8,14 +8,13 @@ import jsonschema
 from flask import Blueprint, jsonify, request, abort, current_app
 
 from .auth import httpauth
-#from .active import save_last_state
 from .utils import first, fuzzy_list_find, ActiveStatus
 
 sensors_views = Blueprint('sensors', __name__)
 
 ALLOWED_SENSORS_KEYS = json.load(
     open(resource_filename('spaceapi', 'schema/sensors.json'),
-         encoding='utf-8')
+        encoding='utf-8')
 )
 
 RADIATON_SUBKEYS = frozenset(('alpha', 'beta', 'gamma', 'beta_gamma'))
diff --git a/spaceapi/templates/base.html b/spaceapi/templates/base.html
--- a/spaceapi/templates/base.html
+++ b/spaceapi/templates/base.html
@@ -8,8 +8,14 @@
 
 {% block body %}
   <div class="container">
-    {% block navbar %}
-    {% endblock %}
+    <div class="navbar navbar-default">
+      <div class="navbar-collapse collapse">
+        <ul class="nav navbar-nav">
+          <li><a href="{{ url_for('root.index') }}">State</a></li>
+          <li><a href="{{ url_for('root.open') }}">Change state</a></li>
+        </ul>
+      </div>
+    </div>
     <div class="row" id="content">
       <div class="col-md-12">
         {% block content %}
diff --git a/spaceapi/templates/index.html b/spaceapi/templates/index.html
--- a/spaceapi/templates/index.html
+++ b/spaceapi/templates/index.html
@@ -2,10 +2,10 @@
 
 {% block content %}
     {% if status['state']['open'] %}
-      <img src="{{ url_for('static', filename='open.png') }}"></img>
-      <p>Yes, we're open!</p>
+      <img src="{{ url_for('static', filename='open.png') }}" class="center-block"></img>
+      <p class="text-center">Yes, we're open!</p>
     {% else %}
-      <img src="{{ url_for('static', filename='closed.png') }}"></img>
-      <p>Sorry, we're closed!</p>
+      <img src="{{ url_for('static', filename='closed.png') }}" class="center-block"></img>
+      <p class="text-center">Sorry, we're closed!</p>
     {% endif %}
 {% endblock %}
diff --git a/spaceapi/templates/open.html b/spaceapi/templates/open.html
--- a/spaceapi/templates/open.html
+++ b/spaceapi/templates/open.html
@@ -1,10 +1,10 @@
 {% extends "base.html" %}
 
 {% block content %}
-  <form method="POST">
-    <div class="form-group">
-      <input type="submit" name="open" value="open">
-      <input type="submit" name="close" value="close">
-    </div>
-  </form>
+  <div class="text-center">
+    <form method="POST" style="display: inline-block;">
+      <input type="submit" name="open" value="open" class="btn btn-success btn-lg">
+      <input type="submit" name="close" value="close" class="btn btn-danger btn-lg">
+    </form>
+  </div>
 {% endblock %}
diff --git a/spaceapi/utils.py b/spaceapi/utils.py
--- a/spaceapi/utils.py
+++ b/spaceapi/utils.py
@@ -12,8 +12,6 @@ if not os.path.exists(default_json_file)
 elif not os.path.isfile(default_json_file):
     raise RuntimeError('default.json is not a file!')
 
-_default_json = {}
-
 
 class Singleton:
 
@@ -32,33 +30,24 @@ class Singleton:
 class ActiveStatus(Singleton, dict):
 
     def reload(self):
-        global _default_json
 
         with open(default_json_file, encoding='utf-8') as f:
-            _default_json = json.load(f)
+            self.update(json.load(f))
 
         if os.path.exists(last_state_file) and os.path.isfile(last_state_file):
             with open(last_state_file, encoding='utf-8') as f:
-                self.update(json.load(f))
-
-            if os.path.getmtime(last_state_file) \
-               < os.path.getmtime(default_json_file):
-                backup_open = self['state']['open']
-                backup_lastchange = self['state']['lastchange']
-                backup_sensors = self['sensors']
+                last_state_json = json.load(f)
 
-                self.update(_default_json)
-
-                self['state']['open'] = backup_open
-                self['state']['lastchange'] = backup_lastchange
-                self['sensors'].update(backup_sensors)
-        else:
-            self.update(_default_json)
+            self['state'] = last_state_json['state']
+            self['sensors'].update(last_state_json['sensors'])
 
     def save_last_state(self):
 
         with open(last_state_file, mode='w', encoding='utf-8') as f:
-            json.dump(self, f, sort_keys=True)
+            last_state = {}
+            last_state['state'] = self['state']
+            last_state['sensors'] = self['sensors']
+            json.dump(last_state, f, sort_keys=True)
 
 
 def request_wants_json():
diff --git a/spaceapi/views.py b/spaceapi/views.py
--- a/spaceapi/views.py
+++ b/spaceapi/views.py
@@ -32,8 +32,10 @@ def reload():
 def open():
     if request.method == 'POST':
         if 'close' in request.form:
-            return set_new_state('open', False)
+            set_new_state('open', False)
+            return redirect(url_for('root.index'))
         elif 'open' in request.form:
-            return set_new_state('open', True)
+            set_new_state('open', True)
+            return redirect(url_for('root.index'))
 
     return render_template('open.html')