Hardhat Smart Contract Lottery

This repository hosts a decentralized and fully automated lottery system built with Hardhat. It utilizes Chainlink VRF (Verifiable Random Function) for secure randomness and Chainlink Keepers for automated operations, ensuring transparency and autonomy in selecting lottery winners.

Features

• Decentralized Automation: The lottery operates without manual intervention, leveraging Chainlink Keepers for periodic tasks.
• Secure Randomness: Ensures fairness in winner selection using Chainlink VRF.
• Extensive Testing: Includes unit tests, staging tests, and mock contracts for robust development.
• Customizable Deployment: Easily deployable on Ethereum testnets like Sepolia and others.

Prerequisites

Before starting, ensure the following tools are installed:

• Node.js
• Hardhat
• A Chainlink-compatible wallet (e.g., MetaMask)

Getting Started

Clone the Repository

git clone https://github.com/junaid5598/hardhat-smartcontract-lottery.git
cd hardhat-smartcontract-lottery

Install Dependencies

yarn install

Environment Setup

Create a .env file and add the following keys:

• PRIVATE_KEY: Your wallet's private key (testnet only, no real funds).
• SEPOLIA_RPC_URL: RPC endpoint URL for the Sepolia network (e.g., from Alchemy).

Example:

PRIVATE_KEY=your_private_key
SEPOLIA_RPC_URL=https://sepolia.infura.io/v3/your_project_id

Usage

Deployment

Deploy contracts to the desired network:

yarn hardhat deploy

Testing

Run tests to ensure functionality:

yarn hardhat test

Coverage

Check test coverage:

yarn hardhat coverage

Running the Lottery

1. Fund the Contract: Ensure the contract has enough LINK tokens for Chainlink operations.
2. Start Lottery: Use scripts to initiate the lottery.
3. Draw Winner: Automatically triggered by Chainlink Keepers, or manually for testing.

Contributions

Contributions are welcome! Please fork the repository, make changes, and submit a pull request.

Let me know if further modifications are needed!