pxt-calliope/docs/lessons/love-meter/activity.md
2016-04-13 08:48:42 -07:00

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# love meter blocks activity
Create a love meter with the micro:bit
### ~avatar avatar
### @video td/videos/love-meter-0
Welcome! This activity will help you create a love meter with the micro:bit. Let's get started!
### ~
Begin by registering an event with `on pin pressed` *P0* to know when someone is holding pin *P0* and pin *Gnd*.
```blocks
input.onPinPressed(TouchPin.P0, () => {
})
```
We are going to create a meter that displays a random number from *0* to *10*. We use *10* as `random number up to` returns a number between *0* and *n*.
```blocks
input.onPinPressed(TouchPin.P0, () => {
let x = Math.random(10)
})
```
Finally, let's show that number on the micro:bit. You are registering an event handler that will execute on the BBC micro:bit whenever the user holds the GND pin with one hand, and presses pin 0 with the other hand, thus completing a circuit
```blocks
input.onPinPressed(TouchPin.P0, () => {
let x = Math.random(10)
basic.showNumber(x)
})
```
### ~avatar avatar
Excellent, you're ready to continue with the [challenges](/lessons/love-meter/challenges)
### ~