Program Flow

For the program flow:

1. When the system is power on.
2. User will used keypad to key in the amount that plan to spend. ( under budget)
3. The he will start to shop by pressing the '+' button or '-' button to add or drop item.
4. Then, the LCD will show the total balance that already been scanned.
5. There is another push button for him to press as reset to clear the total. So, the next user can be use if they plan to budget.

There are 3 items preprogrammed with price and name in the system later. Every time a item touch on RFID reader, the system will add or drop it from purchase list.