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

# telegraph activity 

Build a telgraph.

# micro:bit telegraph

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

In this project, you will build your telegraph between micro:bits. Project duration: 15 minutes.

## Materials

* 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 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 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 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 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 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 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 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 micro:bit

### Step 9

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


### ~avatar avatar

Excellent, you're ready to continue with the [challenges](/lessons/telegraph/challenges)!

### ~