simple-lottery-contract

Simple lottery contract

Simple Lottery Smart Contract

A decentralized lottery contract built with Solidity that allows users to participate in a transparent and fair lottery system.

🎯 Features

• Entry Fee System: Configurable minimum entry fee set during deployment
• Fair Winner Selection: Pseudo-random winner selection using blockchain data
• Duplicate Prevention: Each address can only enter once per lottery round
• Owner Protections: Contract owner cannot participate but receives 10% fee
• Event Logging: All major actions emit events for tracking
• Lottery Reset: Owner can start new lottery rounds

📋 Contract Details

• Contract Name: SimpleLottery
• Solidity Version: ^0.8.0
• License: MIT

🚀 Deployment

Constructor Parameters

• _entryFeeInWei: Entry fee amount in Wei (e.g., 10000000000000000 for 0.01 ETH)

Example Deployment Values

• 0.001 ETH: 1000000000000000
• 0.01 ETH: 10000000000000000
• 0.1 ETH: 100000000000000000

🎮 How to Use

For Players

1. Call enter() function with at least the minimum entry fee
2. Wait for owner to call pickWinner()
3. Winner receives 90% of total prize pool

For Owner

1. Deploy contract with desired entry fee
2. Wait for players to enter
3. Call pickWinner() to select winner and distribute prizes
4. Optionally call resetLottery() to start a new round

📊 View Functions

• getPlayers(): Returns array of all player addresses
• getPlayerCount(): Returns number of current players
• getContractBalance(): Returns current contract balance
• isPlayerEntered(address): Check if specific address has entered

⚠️ Important Notes

• This uses pseudo-random number generation (not truly random)
• Owner receives 10% fee from total prize pool
• Contract owner cannot participate as a player
• For production use, consider using Chainlink VRF for true randomness

📜 Contract Address

[Add your deployed contract address here]

• Network: [Add network name]
• Block Explorer: [Add block explorer link]

🛠️ Built With

• Solidity ^0.8.0
• Remix IDE
• [Add network used]

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

👨‍💻 Developer

Created as part of smart contract development practice.

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Note: This is for educational/demonstration purposes. Always audit smart contracts before using with real funds.