Parking meter

 The project is to design and implement a parking meter. o When you add a coin to the parking meter, time is added during which you can legally park your car. The meter shows the remaining time in a unit of second continuously, and stops at zero.  Types of coins and their worth Pushbutton 0 (PB0) Add 30 seconds Pushbutton 1 (PB1) Add 60 seconds Pushbutton 2 (PB2) Add 120 seconds Pushbutton 3 (PB3) Add 300 seconds  The machine should have a RESET switch which makes the deposited value zero. o There are two stages in the project.  1st stage (worth: 40%, demonstration on Dec. 20 (Wed.) and 22 (Fri.))  Time is added according to the coin’s worth as summarized in the table above. Pressing a pushbutton represents inserting a coin.  The meter shows the remaining time every second with a unit of second.  When it reaches zero, it remains to show zero until a new coin is inserted. 