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

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2016-03-26 00:47:20 +01:00
# love meter activity
create a love meter with the BBC micro:bit #docs
### ~avatar avatar
### @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!
### ~
To create a new script, go to the [Create Code](/microbit/create-code) page and tap *New Project* under **Touch Develop**.
Begin by registering an event with `input->on pin pressed(PO)` to know when someone is holding pin ``P0`` and pin ``Gnd``.
```
input.onPinPressed("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("P0", () => {
let x = Math.random(11)
})
```
Finally, let's show that number on the micro:bit.
```
input.onPinPressed("P0", () => {
let x_ = Math.random(11)
basic.showNumber(x_, 150)
})
```
### ~avatar avatar
Excellent, you're ready to continue with the [challenges](/microbit/lessons/love-meter/challenges)!
### ~