This document outlines a PLC programming project to design and implement a coin-operated vending machine controller. The vending machine will accept three types of coins and allow customers to select from five products. It will only vend one product at a time and start vending once the inserted coins meet or exceed the product's price. A flowchart shows the process, which involves inserting coins, selecting a product, dispensing the product if enough money has been inserted, and including options to reset or cancel the transaction. The project aims to gain knowledge about the basics of vending machine operation using a programmable logic controller.

1. VENDING MACHINE
PLC PROGRAMMING PROJECT
MEMBER :
RAHUL
MELKAMU

2. INTRODUCTION
● Vending machine is a machine that dispenses merchandise after customer deposits money. It
provides various snacks, beverages, cigarette and other products to consumers.
● The idea is to vend products without a cashier. Items sold via vending machine.
● The first vending machine is believed to have been invented by Hero of Alexandria, a first-
century inventor.
● Most vending machines are designed as large safes.
● Most of vending machines are see-through or glass-front merchandisers. This is because it
can show clearly and customer able to browse.
● Usually vending machines use a spiral kind of mechanism to separate and to hold the
products.
● When the machine vends, the spiral turns, thus pushing the product forward and falling
down to be vended.

3. This project will design and implement a
coin operated vending machine controller
The Project Involved:
● Design of vending machine
● PLC programming
● Concept of digital logic

4. Vending Machine Features
➢ Vend 5 products
➢ Accept 3 kinds of coins(50c , $1 , $2)
➢ One coin can be entered at one time
➢ Self-starting with the initial coin
➢ First insert coins, then choose one product at a time!! (cannot vend more than one
product at a time)

5. Design Specifications
Inputs
Accept 3 kinds of coins(50c , $1 , $2)
Output
Selected drink
Buttons
1 button for turn on/off programme (main switch)
3 buttons for coin input
5 buttons for select product
1 button for reset program or cancel process
Equipment used
5 motors
2 LED
2 resistor 330ohm

12. START
END
WAIT FOR COIN
SPRITEL&PFANTA
COKE
ZERO
COKE
IF
TOTAL = $2
SELECT DRINK
RESET/CANCEL
● DISPENSE DRINK
FLOW CHART

13. Summary
➢ This project proposal telling that the component that might be used.
➢ Our target is to gain knowledge about the basics of how a vending machine works using
Programmable Logic Controller.
➢ The flowchart show the flow of process that happen when the user try to buy the product.
➢ vending machine respond to the user’s decision on deciding which product he/she want.
➢ As they press the switch, the can will drop to the outlet corner to let the user get it.

14. THANK YOU