Add comment about pigpio, fix final raw_input

MotorControl/ESC.py

@@ -5,7 +5,7 @@
 
 import os     #importing os library so as to communicate with the system
 import time   #importing time library to make Rpi wait because its too impatient 
-os.system ("sudo pigpiod") #Launching GPIO library
+os.system ("sudo pigpiod") #Launching GPIO library, will say it can't connect if already running
 time.sleep(1) # As i said it is too impatient and so if this delay is removed you will get an error
 import pigpio #importing GPIO library
 
@@ -94,7 +94,7 @@ def control():
             
 def arm(): #This is the arming procedure of an ESC 
     print("Connect the battery and press Enter")
-    inp = raw_input()    
+    inp = input()    
     if inp == '':
         pi.set_servo_pulsewidth(ESC, 0)
         time.sleep(1)