pxt-calliope/docs/reference/js/lessons/telegraph/activity.md

# telegraph activity 

build a telgraph.

# BBC micro:bit telegraph

![](/static/mb/lessons/telegraph-0.png)

In this project, you will build your telegraph 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/telegraph-0.png)

Your telegraph is ready!

### Step 10

* Connect the first BBC micro:bit to your computer using your USB cable and run the [telegraph](/xvmxti) script on it.
* Connect the second BBC micro:bit to your computer using your USB cable and run the [telegraph](/xvmxti) script on it.
* The first person and second person take turns pressing button A to play the telegraph game!