hello. im doing a project of one my subject. i'm making a smart parking system. in which a sensor will detect the presence of car and the arm gate will be open. im making a very simple parking system. i need your opinion on what is the best sensor to be used at the arm gate so that it can detect the presence of the car. im using arduino uno and already get all the coding and it seems to be correct since the arm gate motor is moving. im using push button instead of sensor to test it out. so i need your kindness to give your opinion regarding my project. one more thing, i want to connect my system to internet. so is it best to use gsm or ethernet shield? since im the beginner in all this thing
thank you a lot