Getting Started with Chainlink Automation

Increment a counter every 5 minutes using our example contract.

1. Navigate to the Chainlink Automation app and connect to Arbitrum Sepolia in the top dropdown menu.

2. Connect your cryptocurrency wallet to the app if you haven't done so already. You may also need to fetch Arbitrum Sepolia testnet LINK here.

3. Click Register new Upkeep and select Time-based trigger.

4. Under Target contract address, enter 0x698a3a4B0a98dda279795521Bd6f63cdBE605125. This is a simple counter contract that will just increment with each call. Source code is here.

5. In the Contract call section, enter addInteger under Target function. In the Function inputs section, enter a number to increment by under intToAdd. Then click Next.

   

6. Now specify the time schedule, for example every 5 minutes. Paste the cron expression */5 * * * * under Cron expression or select one of the example timers. Then click Next.

7. To learn more about CRON expressions, click here.

8. Enter an Upkeep name, your public key address under Admin Address, 500000 under Gas limit, and 0.1 under Starting balance (LINK).

   

9. Click Register Upkeep.

10. After the transaction has completed, you can view the performs for your upkeep in the upkeep details.

You have successfully automated your first time-based upkeep. To learn more about creating time-based upkeeps, read here.

Increment a counter using custom logic stored on-chain.

1. Navigate to the Chainlink Automation app and connect to Arbitrum Sepolia in the top dropdown menu.

2. Connect your cryptocurrency wallet to the app if you haven't done so already. You may also need to fetch Arbitrum Sepolia testnet LINK here.

3. Click Register new Upkeep and select Custom logic trigger.

4. Under Target contract address, enter 0xC3d3656868594db09abD410821c9F9ab9812B4d1. This contract uses logic stored on-chain and on-chain state to determine when to perform, incrementing a counter. It is an example of an Automation-compatible contract and can be read here. Click Next.

   

5. Enter an Upkeep name, your public key address under Admin Address, 500000 under Gas limit, and 0.1 under Starting balance (LINK).

6. Finally, enter your public key address under Check data (Hexadecimal). checkData is optional static data that you can pass into your upkeep to ensure your counter increments.

7. Click Register Upkeep.

8. After the transaction is complete, you can view the performs for your upkeep in the upkeep details. Your upkeep should perform once every minute and stop after 4 performs.

You have successfully automated your first custom logic upkeep. To learn more about creating custom logic upkeeps, read here.

Increment an on-chain counter using a log as trigger.

1. Navigate to the Chainlink Automation app and connect to Arbitrum Sepolia in the top dropdown menu.

2. Connect your cryptocurrency wallet to the app if you haven't done so already. You may also need to fetch Arbitrum Sepolia testnet LINK here.

3. Click Register new Upkeep and select log trigger.

4. Under Contract to automate, enter 0xcf39b55F3E583DdEc8D418dB4708A71aA8453a83. This is a simple iLogAutomation-compatible example contract that will increment a counter when a log is detected. The code is here. Click Next.

5. Under Contract emitting logs, enter 0xeB4ABE57c2ba0A467273f9b7fDed130AD863e923. This is the contract Automation will listen to for emitted logs. The code is here. Click Next.

   

6. Under Emitted log select Bump from the dropdown menu. This is the log signature Automation will look for.

7. Log index topic filters are optional filters to narrow the logs you want to trigger your upkeep. For our example enter your public key address under addr and leave the num field empty. Later when you call the bump function to emit the log, your msg.Sender address will be emitted in the log, triggering your upkeep. Click Next.

   

8. Enter an Upkeep name, your public key address under Admin Address, 500000 under Gas limit, and 0.1 under Starting balance (LINK).

9. Click Register Upkeep and wait for the transaction to complete.

10. To trigger your upkeep call bump on the trigger contract by navigating to the Arbitrum Sepolia scanner, connecting your wallet and executing the bump function. You can observe your upkeep's perform in the Automation dashboard.

You have successfully automated your first log trigger upkeep. To learn more about creating log trigger upkeeps, read here.