SimpleStorage Solidity Project

This is a Solidity-based project for deploying and interacting with a SimpleStorage smart contract on the Ethereum Sepolia testnet using Hardhat.

Prerequisites

Ensure you have the following installed:

• Node.js
• Hardhat
• MetaMask (for interacting with the deployed contract)
• Alchemy or Infura (for an RPC URL)

Setup

1. Clone the repository:

   git clone https://github.com/tharun977/my-solidity-project.git
   cd my-solidity-project

2. Install dependencies:

   npm install

3. Create a .env file in the project root and add:

   SEPOLIA_RPC_URL=your-alchemy-or-infura-url
   PRIVATE_KEY=your-wallet-private-key

Compilation

Compile the Solidity contracts:

npx hardhat compile

Deployment

Deploy the contract to Sepolia testnet:

npx hardhat run scripts/deploy.js --network sepolia

If you see an error about insufficient funds, get test ETH from a Sepolia Faucet.

Interacting with the Contract

In the Hardhat console:

npx hardhat console --network sepolia

Then, run the following commands:

const contract = await ethers.getContractAt("SimpleStorage", "DEPLOYED_CONTRACT_ADDRESS");
await contract.setNumber(42); // Set a value
console.log(await contract.getNumber()); // Read stored value

Troubleshooting

• Invalid private key error: Ensure PRIVATE_KEY in .env is correct and 64 characters long.
• Compiler version mismatch: Update solidity version in hardhat.config.js to match your contract pragma.
• Hardhat HH701 Error: Use the fully qualified contract name, e.g., contracts/SimpleStorage.sol:SimpleStorage.
• Insufficient funds: Check balance using:

  npx hardhat console --network sepolia

  const [deployer] = await ethers.getSigners();
  console.log(await deployer.getBalance());