pxt-calliope/docs/reference/js/lessons/love-meter/activity.md

# love meter activity

create a love meter with the BBC micro:bit #docs

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### @video td/videos/love-meter-0

Welcome! This tutorial will help you create a love meter with the BBC micro:bit. Let's get started!

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Begin by registering an event with `input->on pin pressed(PO)` to know when someone is holding pin ``P0`` and pin ``Gnd``.

```
input.onPinPressed(TouchPin.P0, () => {
})
```

We are going to create a meter that displays a random number from 0 to 10. We use ``11`` as `math->random(n)` returns a number between ``0`` and ``n-1``.

```
input.onPinPressed(TouchPin.P0, () => {
    let x = Math.random(11)
})
```

Finally, let's show that number on the micro:bit.

```
input.onPinPressed(TouchPin.P0, () => {
    let x_ = Math.random(11)
    basic.showNumber(x_, 150)
})
```

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

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