diff --git a/src/sensor/people_counter.py b/src/sensor/people_counter.py
index 2db162a..a3d5a24 100644
--- a/src/sensor/people_counter.py
+++ b/src/sensor/people_counter.py
@@ -1,9 +1,12 @@
+from typing import Dict
 from sensor.tof_sensor import ToFSensor, Directions
 from datetime import datetime
 import logging
 
 
 COUNTING_CB = "counting"
+ACTIVITY_CB = "activity"
+CHANGE_CB = "changes"
 START_TIME = "start"
 END_TIME = "end"
 
@@ -11,7 +14,7 @@ END_TIME = "end"
 class PeopleCounter ():
     def __init__(self, sensor: ToFSensor) -> None:
         self.sensor = sensor
-        self.callbacks = {COUNTING_CB: []}
+        self.callbacks = {COUNTING_CB: [], ACTIVITY_CB: [], CHANGE_CB: []}
         self.maxTriggerDistance = 120   # In cm
 
     def hookCounting(self, cb) -> None:
@@ -20,17 +23,28 @@ class PeopleCounter ():
     def unhookCounting(self, cb) -> None:
         self.callbacks[COUNTING_CB].remove(cb)
 
+    def hookActivity(self, cb) -> None:
+        self.callbacks[ACTIVITY_CB].append(cb)
+
+    def unhookActivity(self, cb) -> None:
+        self.callbacks[ACTIVITY_CB].remove(cb)
+
+    def hookChange(self, cb) -> None:
+        self.callbacks[CHANGE_CB].append(cb)
+
+    def unhookChange(self, cb) -> None:
+        self.callbacks[CHANGE_CB].remove(cb)
+
+    def getInitialDirectionState(self) -> Dict:
+        return {
+            Directions.INSIDE: [],
+            Directions.OUTSIDE: []
+        }
+
     def run(self) -> None:
         self.keepRunning = True
         direction = Directions.INSIDE
-        self.directionState = {
-            Directions.INSIDE: {
-                START_TIME: None, END_TIME: None
-            },
-            Directions.OUTSIDE: {
-                START_TIME: None, END_TIME: None
-            }
-        }
+        self.directionState = self.getInitialDirectionState()
 
         self.sensor.open()
         while self.keepRunning:
@@ -47,19 +61,27 @@ class PeopleCounter ():
                 countChange: int = self.getCountChange(self.directionState)
                 self.handleCallbacks(countChange)
 
+                # Reset records
+                self.directionState = self.getInitialDirectionState()
+
         self.sensor.close()
 
     def getCountChange(self, directionState) -> int:
         # Is valid?
         for direction in Directions:
-            if directionState[direction][START_TIME] is None or directionState[direction][END_TIME] is None:
+            # Is there at least one record for every direction?
+            if len(directionState[directionState]) <= 0:
+                return 0
+
+            # Did every record start and end?
+            if directionState[direction][0][START_TIME] is None or directionState[direction][-1][END_TIME] is None:
                 return 0    # Return no change if not valid
 
         # Get times into variables
-        insideStart = directionState[Directions.INSIDE][START_TIME]
-        insideEnd = directionState[Directions.INSIDE][END_TIME]
-        outsideStart = directionState[Directions.OUTSIDE][START_TIME]
-        outsideEnd = directionState[Directions.OUTSIDE][END_TIME]
+        insideStart = directionState[Directions.INSIDE][0][START_TIME]
+        insideEnd = directionState[Directions.INSIDE][-1][END_TIME]
+        outsideStart = directionState[Directions.OUTSIDE][0][START_TIME]
+        outsideEnd = directionState[Directions.OUTSIDE][-1][END_TIME]
 
         # In what direction is the doorframe entered and left?
         # Entering doorframe in the inside direction
@@ -113,17 +135,28 @@ class PeopleCounter ():
         for cb in self.callbacks[COUNTING_CB]:
             cb(countChange)
 
+    def getDirectionTime(self, direction: Directions, time: str) -> datetime:
+        if len(self.directionState[direction]) <= 0:
+            return None
+
+        return self.directionState[direction][-1][time]
+
     def updateState(self, direction: Directions, triggered: bool) -> bool:
-        currentlyTriggered = self.directionState[direction][END_TIME] == None
+        currentlyTriggered = False
+        if len(self.directionState[direction]) > 0:
+            currentlyTriggered = self.getDirectionTime(
+                direction, END_TIME) is None
 
         if triggered and not currentlyTriggered:
             # Set as new beginning for this direction
-            self.directionState[direction][START_TIME] = datetime.now()
-            self.directionState[direction][END_TIME] = None
+            self.directionState[direction].append({
+                START_TIME: datetime.now(),
+                END_TIME: None
+            })
             return True
         elif not triggered and currentlyTriggered:
-            # Set as new end for this direction
-            self.directionState[direction][END_TIME] = datetime.now()
+            # Set as end for this direction
+            self.directionState[direction][-1][END_TIME] = datetime.now()
             return True
 
         return False