1. Players can enter the lottery by depositing some ETH
2. After a specific time interval, a winner in randomly selected
3. The lottery is reset, and players can re-enter again

1. Setup environment variabltes

You'll want to set your RINKEBY_RPC_URL and PRIVATE_KEY as environment variables. You can add them to a .env file, similar to what you see in .env.example.

• PRIVATE_KEY: The private key of your account (like from metamask). NOTE: FOR DEVELOPMENT, PLEASE USE A KEY THAT DOESN'T HAVE ANY REAL FUNDS ASSOCIATED WITH IT.
  • You can learn how to export it here.
• RINKEBY_RPC_URL: This is url of the rinkeby testnet node you're working with. You can get setup with one for free from Alchemy

2. Get testnet ETH

Head over to faucets.chain.link and get some tesnet ETH & LINK. You should see the ETH and LINK show up in your metamask. You can read more on setting up your wallet with LINK.

3. Setup a Chainlink VRF Subscription ID

Head over to vrf.chain.link and setup a new subscription, and get a subscriptionId. You can reuse an old subscription if you already have one.

You can follow the instructions if you get lost. You should leave this step with:

1. A subscription ID

2. Your subscription should be funded with LINK

3. Deploy

In your helper-hardhat-config.js add your subscriptionId under the section of the chainId you're using (aka, if you're deploying to rinkeby, add your subscriptionId in the subscriptionId field under the 4 section.)

Then run:

yarn hardhat deploy --network rinkeby

And copy / remember the contract address.

4. Add your contract address as a Chainlink VRF Consumer

Go back to vrf.chain.link and under your subscription add Add consumer and add your contract address. You should also fund the contract with a minimum of 1 LINK.

5. Register a Chainlink Keepers Upkeep

You can follow the documentation if you get lost.