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rename micro:bit to @boardname@

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Peli de Halleux
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docs/projects/magic-button-trick.md
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# magic button trick
Perform a magic trick where you appear to make the **A** and **B** button of your micro:bit swap over just by moving a sticky label.
Perform a magic trick where you appear to make the **A** and **B** button of your @boardname@ swap over just by moving a sticky label.
### ~avatar avatar
Welcome! This activity will teach you how to use the micro:bit's compass to detect a nearby magnet
Welcome! This activity will teach you how to use the @boardname@'s compass to detect a nearby magnet
### ~
This is a simple magic trick you can perform to amaze your friends, where by moving the sticky labels on your micro:bit's **A** and **B** button you appear to make the buttons really switch over. To see the trick performed watch the video below.
This is a simple magic trick you can perform to amaze your friends, where by moving the sticky labels on your @boardname@'s **A** and **B** button you appear to make the buttons really switch over. To see the trick performed watch the video below.
https://youtu.be/-9KvmPopov8
## How the trick works
Unfortunately, the only magic here is in the code. This trick uses a magnet, hidden in your hand, to tell the micro:bit to swap over the buttons so that when the magnet is near the microbit the **A** button starts working like the **B** button and the **B** button starts working like the **A** button.
Unfortunately, the only magic here is in the code. This trick uses a magnet, hidden in your hand, to tell the @boardname@ to swap over the buttons so that when the magnet is near the microbit the **A** button starts working like the **B** button and the **B** button starts working like the **A** button.
## What you need
The only things you need for this trick are your micro:bit and any magnet that is small enough to fit in your hand, even a fridge magnet will work.
The only things you need for this trick are your @boardname@ and any magnet that is small enough to fit in your hand, even a fridge magnet will work.
![](/static/mb/projects/magic-button-trick/magnets.jpg "Magnets")
@ -37,7 +37,7 @@ input.onButtonPressed(Button.B, () => {
## Step 2: measuring magnetic force
We will use the micro:bit's compass to detect the magnet. Compass's tell us what direction we are pointing by detecting the Earth's magnetic field but they can also detect any other magnet nearby. We will use that to check if our magnet is next to the micro:bit by using the [magnetic force](/reference/input/magnetic-force) block found in the input menu's 'more' section. As we only want to measure the strength we change the drop down to select 'strength':
We will use the @boardname@'s compass to detect the magnet. Compass's tell us what direction we are pointing by detecting the Earth's magnetic field but they can also detect any other magnet nearby. We will use that to check if our magnet is next to the @boardname@ by using the [magnetic force](/reference/input/magnetic-force) block found in the input menu's 'more' section. As we only want to measure the strength we change the drop down to select 'strength':
```blocks
input.magneticForce(Dimension.Strength)
@ -56,7 +56,7 @@ let isSwitched = Math.abs(input.magneticForce(Dimension.Strength)) > 100
```
## Step 4: running our 'magnet nearby' check all the time
At the moment our code to detect the magnet being nearby will only run once so we need to put it into a [forever](/reference/basic/forever) block so that it keeps getting run again and again checking for the magnet to come near to the micro:bit. We should also make sure 'isSwitched' is false when our program starts.
At the moment our code to detect the magnet being nearby will only run once so we need to put it into a [forever](/reference/basic/forever) block so that it keeps getting run again and again checking for the magnet to come near to the @boardname@. We should also make sure 'isSwitched' is false when our program starts.
```blocks
let isSwitched = false;
@ -94,8 +94,8 @@ input.onButtonPressed(Button.B, () => {
```
## step 5: practice your performance
Now you just need to program your own micro:bit and practice the trick a few times before performing to friends. Try asking your friends to click the buttons after you have switched the labels and the trick won't work for them as they don't have a hidden magnet in their hand.
Now you just need to program your own @boardname@ and practice the trick a few times before performing to friends. Try asking your friends to click the buttons after you have switched the labels and the trick won't work for them as they don't have a hidden magnet in their hand.
## about the authors
This project was contributed by Brian and Jasmine Norman, aka [@MicroMonstersUK](https://twitter.com/MicroMonstersUK). You can chekout their [micro:bit tutorials chanel on youtube](https://www.youtube.com/channel/UCK2DviDexh_Er2QYZerZyZQ) for more projects.
This project was contributed by Brian and Jasmine Norman, aka [@MicroMonstersUK](https://twitter.com/MicroMonstersUK). You can chekout their [@boardname@ tutorials chanel on youtube](https://www.youtube.com/channel/UCK2DviDexh_Er2QYZerZyZQ) for more projects.