https://github.com/chayashri2308/vending_machine

A simple Vending Machine design for only one product using Verilog. The user can enter three different currency notes and based on the price of the product, the machine dispenses the product and gives the change.
https://github.com/chayashri2308/vending_machine

verilog

Last synced: about 1 month ago
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A simple Vending Machine design for only one product using Verilog. The user can enter three different currency notes and based on the price of the product, the machine dispenses the product and gives the change.

• Host: GitHub
• URL: https://github.com/chayashri2308/vending_machine
• Owner: Chayashri2308
• Created: 2024-09-07T04:24:37.000Z (4 months ago)
• Default Branch: main
• Last Pushed: 2024-11-12T17:06:53.000Z (about 2 months ago)
• Last Synced: 2024-11-12T17:28:20.422Z (about 2 months ago)
• Topics: verilog
• Homepage:
• Size: 0 Bytes
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Vending_Machine

# A simple Vending Machine design for only one product using Verilog. The user can enter three different currency notes and based on the price of the product, the machine dispenses the product and gives the change. 

`timescale 1ns / 1ps

module vending_machine(

    input clk,

    input reset,

    input [1:0] currency, // Currency type: 2'b00 = 1 unit, 2'b01 = 2 units, 2'b10 = 5 units

    input buy,            // Button to buy the product

    output reg dispense,   // Dispense the product

    output reg [3:0] change // Change to be returned

);

    // Parameters

    parameter PRODUCT_PRICE = 5; // Price of the product in units

    

    // Registers

    reg [3:0] total_amount; // Total amount inserted

    // Process currency inputs

    always @(posedge clk or posedge reset) begin

        if (reset) begin

            total_amount <= 0;

            dispense <= 0;

            change <= 0;

        end else if (buy) begin

            // Check if sufficient funds are available to buy the product

            if (total_amount >= PRODUCT_PRICE) begin

                dispense <= 1;

                change <= total_amount - PRODUCT_PRICE; // Calculate the change

                total_amount <= 0; // Reset the amount after purchase

            end else begin

                dispense <= 0; // Insufficient funds

                change <= 0;

            end

        end else begin

            dispense <= 0;

            change <= 0;

            // Update total amount based on currency type inserted

            case (currency)

                2'b00: total_amount <= total_amount + 1; // 1 unit

                2'b01: total_amount <= total_amount + 2; // 2 units

                2'b10: total_amount <= total_amount + 5; // 5 units

                default: total_amount <= total_amount;   // No change

            endcase

        end

    end

endmodule