Change-Exchange Currency based Vending Machine using VHDL

A vending machine is a coin-operated, automatic device which dispenses items such as snacks, beverages, lottery tickets, consumer products and even gold and gems to customers automatically, after the customer inserts currency or credit into the machine. These are more accessible and practical than the convention purchasing method. It is for the reason that vending machines provide us for our necessities almost instantly and with high quality, that people consider it as a very much reliable choice. In this paper a new approach is proposed to design a Vending Machine with automatic currency change or exchange multi select feature using which user can get a change of its currency or can exchange its currency to other available currency options. The machine also supports a cancel feature which means that the user can withdraw the request and the money will be returned back to him. This machine can be used at various places like Hotels, Restaurants, Stations and shopping centers. This reduces the time and cost. The proposed model is implemented using FPGA, the simulation results and circuit parameters are also presented.