Embedded Systems.

Describe design of a vending machine, which is available exclusively for employees. Each employee has

an RFID card with a number of credits. Using the card he$/$she can purchase snacks and drinks from the

machine. When an employee puts the card next to the RFID reader, the machine displays the number

of available credits. Next, using a keypad, the employee can select a product he$/$she would like to

purchase and, after confirmation, the machine dispenses the ordered product and deducts

corresponding number of credits from the employee$$s balance. Obviously, if the number of credits is

insufficient, the machine will reject the order.

The system is based on one or more Arduino boards and additional components. Design the structure

of the system, select components and sketch the structure of the system software.

$*$ General idea of the solution:

$*$ Component list: components require a short description explaining how they work and how

they communicate with Arduino. Estimate the total cost of the system

$*$ System schematic: The most important thing is to be specific, i$.$e$.,$ to show to which Arduino

pins components are connected.

$*$Software architecture: describe and illustrate with flowcharts how the

software works.