diff --git a/Lakshmi/Vsens.py b/Lakshmi/Vsens.py
new file mode 100644
index 0000000..7244d7b
--- /dev/null
+++ b/Lakshmi/Vsens.py
@@ -0,0 +1,97 @@
+import json
+
+class Vsens:
+    
+    def __init__(self,path,expected_time_from_user,Accelerometer_packets,Temperature_packets,Battery_packets):
+        self.path = path
+        self.data_list = []
+        self.Accelerometer_packets = Accelerometer_packets
+        self.Temperature_packets = Temperature_packets
+        self.Battery_packets = Battery_packets
+        self.acc_count = 0
+        self.temp_count = 0
+        self.battery_count = 0
+        self.disconnected_count = 0
+        self.PID_998 = []
+        self.PID_999 = []
+        self.expected_time_from_user = expected_time_from_user
+        self.sum_of_diff_time = 0
+        self.Actual_test_time = 0
+        
+    def Readfile(self):
+        new_list = []
+        with open(self.path,'r') as f:
+            for i in f:
+                self.data_list.append(json.loads(i))
+        new_list = self.data_list
+        return new_list
+    
+    def Count_packets(self):
+        self.diff_time =0
+        self.index = 0
+        self.flag = 0
+        for i in range(len(self.data_list)):
+            
+            if self.data_list[i]['PID'] == '0':
+                self.acc_count += 1
+            elif self.data_list[i]['PID'] == '1':
+                self.temp_count += 1
+            elif self.data_list[i]['PID'] == '2':
+                self.battery_count += 1
+            elif self.data_list[i]['PID'] == '998':
+                 self.disconnected_count += 1
+                 if self.flag == 0:
+                    self.index = i
+                    self.flag = 1    
+            elif self.data_list[i]['PID'] == '999' and self.flag == 1:
+                self.PID_999.append(self.data_list[i]) 
+                self.diff_time = self.data_list[i]['TS'] - self.data_list[self.index]['TS']
+                self.sum_of_diff_time = self.sum_of_diff_time + self.diff_time
+                self.flag = 0
+
+        return self.acc_count,self.temp_count,self.battery_count,self.disconnected_count
+        
+    def Convert_seconds(self,sum_diff):
+        self.time_in_sec = sum_diff/1000
+        return self.time_in_sec
+
+    def Actual_time_calculate(self,expected_t_user,t_sec):
+        if expected_t_user <= 0:
+            raise ValueError("Expected time cannot be neagative number")
+        self.Actual_test_time = float(expected_t_user) - t_sec
+        return self.Actual_test_time
+        
+    def Calculate_packet_loss(self,expected_packets,actual_count,actual_test_time):
+        
+        self.Actual_packets_recieved = actual_test_time*float(expected_packets)
+        self.packet_loss = round(((self.Actual_packets_recieved - actual_count)/self.Actual_packets_recieved)*100,2)
+        return self.packet_loss
+
+    def Function_call(self):
+        self.Readfile()
+        self.Count_packets()
+        self.Convert_seconds(self.sum_of_diff_time)
+        self.Actual_time_calculate(self.expected_time_from_user,self.time_in_sec)
+        Acc_packet_loss = self.Calculate_packet_loss(self.Accelerometer_packets,self.acc_count,self.Actual_test_time)
+        self.Temperature_packets = (float(self.Temperature_packets)*(1/60))
+        Temp_packet_loss = self.Calculate_packet_loss(self.Temperature_packets,self.temp_count,self.Actual_test_time)
+        self.Battery_packets = (float(self.Battery_packets)*(1/60))
+        Battery_packet_loss = self.Calculate_packet_loss(self.Battery_packets,self.battery_count,self.Actual_test_time)
+        print('***************OUTPUT*************')
+        print('Actual time is : ',self.Actual_test_time,'\n','Disconnected count : ',self.disconnected_count,'\n','Packet loss for accelerometer : ',Acc_packet_loss,'\n','Packet loss for temperature : ',Temp_packet_loss,'\n','Packet loss for battery : ',Battery_packet_loss)
+
+
+path = input("Enter file path : ")
+expected_time_from_user = float(input("Enter the expected time in seconds : "))
+Accelerometer_packets = int(input("Enter expected accelerometer packets : "))
+Temperature_packets = int(input("Enter expected tempreature packets : "))
+Battery_packets  = int(input("Enter expected battery packets : "))
+sensor = Vsens(path,expected_time_from_user,Accelerometer_packets,Temperature_packets,Battery_packets)
+sensor.Function_call()
+
+'''def User_choice(choice):
+    if choice == 1:'''
+        
+
+
+    
\ No newline at end of file
diff --git a/Lakshmi/Vsens_class_v4.py b/Lakshmi/Vsens_class_v4.py
new file mode 100644
index 0000000..fc1962f
--- /dev/null
+++ b/Lakshmi/Vsens_class_v4.py
@@ -0,0 +1,81 @@
+import json
+
+class Vsens:
+    
+    def __init__(self,path,expected_time_from_user,Accelerometer_packets,Temperature_packets,Battery_packets):
+        self.path = path
+        self.data_list = []
+        self.Accelerometer_packets = Accelerometer_packets
+        self.Temperature_packets = Temperature_packets
+        self.Battery_packets = Battery_packets
+        self.acc_count = 0
+        self.temp_count = 0
+        self.battery_count = 0
+        self.disconnected_count = 0
+        self.PID_998 = []
+        self.PID_999 = []
+        self.expected_time_from_user = expected_time_from_user
+        self.sum_of_diff_time = 0
+        self.Actual_test_time = 0
+        
+    def Readfile(self):
+        with open(self.path,'r') as f:
+            for i in f:
+                self.data_list.append(json.loads(i))
+        return self.data_list
+    
+    def Count_packets(self):
+        self.diff_time =0
+        self.index = 0
+        self.flag = 0
+        for i in range(len(self.data_list)):
+            
+            if self.data_list[i]['PID'] == '0':
+                self.acc_count += 1
+            elif self.data_list[i]['PID'] == '1':
+                self.temp_count += 1
+            elif self.data_list[i]['PID'] == '2':
+                self.battery_count += 1
+            elif self.data_list[i]['PID'] == '998':
+                 self.disconnected_count += 1
+                 if self.flag == 0:
+                    self.index = i
+                    self.flag = 1    
+            elif self.data_list[i]['PID'] == '999' and self.flag == 1:
+                self.PID_999.append(self.data_list[i]) 
+                self.diff_time = self.data_list[i]['TS'] - self.data_list[self.index]['TS']
+                self.sum_of_diff_time = self.sum_of_diff_time + self.diff_time
+                self.flag = 0
+      
+    def Actual_time_calculate(self):
+        self.time_in_sec = self.sum_of_diff_time/1000
+        self.Actual_test_time = float(self.expected_time_from_user) - self.time_in_sec
+        
+    def Calculate_packet_loss(self):
+        self.Actual_accelerometer_packets_recieved = self.Actual_test_time*float(self.Accelerometer_packets)
+        self.packet_loss_acc = ((self.Actual_accelerometer_packets_recieved - self.acc_count)/self.Actual_accelerometer_packets_recieved)*100
+    
+        self.Temperature_packets = (float(self.Temperature_packets)*(1/60))
+        self.Actual_temp_packets_recieved = self.Actual_test_time*float(self.Temperature_packets)
+        self.packet_loss_temp = ((self.Actual_temp_packets_recieved - self.temp_count)/self.Actual_temp_packets_recieved)*100
+    
+        self.Battery_packets = (float(self.Battery_packets)*(1/60))
+        self.Actual_battery_packets_recieved = self.Actual_test_time*float(self.Battery_packets)
+        self.packet_loss_battery = ((self.Actual_battery_packets_recieved - self.battery_count)/self.Actual_battery_packets_recieved)*100
+    
+        print('*************************OUTPUT*******************************')
+        print('Actual time is : ',self.Actual_test_time,'\n','Disconnected count : ',self.disconnected_count,'\n','Packet loss for accelerometer : ',self.packet_loss_acc,'\n','Packet loss for temperature : ',self.packet_loss_temp,'\n','Packet loss for battery : ',self.packet_loss_battery)
+
+    def Function_call(self):
+        self.Readfile()
+        self.Count_packets()
+        self.Actual_time_calculate()
+        self.Calculate_packet_loss()
+
+path = input("Enter file path : ")
+expected_time_from_user,Accelerometer_packets,Temperature_packets,Battery_packets  = input("Enter the expected time in seconds ,expected accelerometer packets per second,expected temperature packets per minute,expected battery packets per minute separeted by comma : ").split(',')
+sensor = Vsens(path,expected_time_from_user,Accelerometer_packets,Temperature_packets,Battery_packets)
+sensor.Function_call()
+
+
+    
\ No newline at end of file
diff --git a/Lakshmi/test_Vsens.py b/Lakshmi/test_Vsens.py
new file mode 100644
index 0000000..7df8915
--- /dev/null
+++ b/Lakshmi/test_Vsens.py
@@ -0,0 +1,35 @@
+import Vsens
+import unittest
+
+class Test_Vsens(unittest.TestCase):
+
+    def setUp(self):
+        self.obj = Vsens.Vsens(Vsens.path,Vsens.expected_time_from_user,Vsens.Accelerometer_packets,Vsens.Temperature_packets,Vsens.Battery_packets)
+        self.test_Readfile()
+    def test_Readfile(self):
+        self.assertNotEqual(len(self.obj.Readfile()),0)
+    
+    def test_Count_packets(self):
+        a_count,t_count,b_count,d_count = self.obj.Count_packets()
+        self.assertEqual(a_count,260030)
+        self.assertEqual(t_count,882)
+        self.assertEqual(b_count,883)
+        self.assertEqual(d_count,16)
+
+    def test_Convert_seconds(self):
+         self.assertEqual(self.obj.Convert_seconds(1000),1)
+    
+    def test_input_values(self):
+        self.assertRaises(ValueError,self.obj.Actual_time_calculate,-58156,5249.13)
+        
+    def test_Actual_time_calculate(self):
+        self.assertEqual(self.obj.Actual_time_calculate(-5,2),-7,3)
+
+
+    def test_Calculate_packet_loss(self):
+        self.assertAlmostEqual(self.obj.Calculate_packet_loss(5,260030,52906.87),1.7)
+
+
+
+if __name__ == '__main__':
+    unittest.main()