pxt-calliope/docs/projects/telegraph/making.md

# telegraph - making 

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Let's build a telegraph between two micro:bits.

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

## 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)


### ~button /projects/telegraph/manual-telegraph

NEXT: manual telegraph

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