# ornament chain activity build a telgraph. # Ornament Chain Activity ![](/static/mb/lessons/ornament-chain-0.jpg) ![](/static/mb/lessons/ornament-chain-1.jpg) In this project, you will build your ornament chain between BBC micro:bits. Project duration: 15 minutes. ## Materials * BBC micro:bit, battery holder and 2 AAA batteries * Crocodile clips ## Steps ### Step 1 ![](/static/mb/lessons/banana-keyboard-1.png) Using the 1st crocodile clip, connect the end of the crocodile clip onto GND pin on the BBC micro:bit. ### Step 2 ![](/static/mb/lessons/ornament-chain-2.png) Using the 2nd crocodile clip, connect the end of the crocodile clip onto the 3V pin on the BBC micro:bit. ### Step 3 ![](/static/mb/lessons/ornament-chain-3.png) Using the 3rd crocodile clip, connect the end of the crocodile clip onto pin 1 of the BBC micro:bit. ### Step 4 ![](/static/mb/lessons/ornament-chain-4.png) Using the 4th crocodile clip, connect the end of the crocodile clip onto pin 2 of the BBC micro:bit. ### Step 5 ![](/static/mb/lessons/ornament-chain-5.png) Using the 1st crocodile clip, connect the unattached end of the crocodile clip onto the GND on the 2nd BBC micro:bit. ### Step 6 ![](/static/mb/lessons/ornament-chain-6.png) Using the 2nd crocodile clip, connect the unattached end of the crocodile clip onto the 3V pin on the 2nd BBC micro:bit. ### Step 7 ![](/static/mb/lessons/ornament-chain-7.png) Using the 3rd crocodile clip, connect the unattached end of the crocodile clip onto pin 2 of the 2nd BBC micro:bit. ### Step 8 ![](/static/mb/lessons/ornament-chain-8.png) Using the 4th crocodile clip, connect the unattached end of the crocodile clip onto pin 1 of the 2nd BBC micro:bit ### Step 9 ![](/static/mb/lessons/ornament-chain-0.jpg) ![](/static/mb/lessons/ornament-chain-1.jpg) Your ornament chain is ready! ### Step 10 * Connect the first BBC micro:bit to your computer using your USB cable and run the [ornament chain](/rnvpgo) script on it. * Connect the second BBC micro:bit to your computer using your USB cable and run the [ornament chain](/rnvpgo) script on it. * The first person and second person take turns pressing button A to start the ornament chain game!