pxt-calliope/docs/lessons/love-meter.md

# love meter blocks lesson

create a love meter with the BBC micro:bit.

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

## Topic

On Pin Pressed

## Quick Links

* [activity](/microbit/lessons/love-meter/activity)
* [quiz](/microbit/lessons/love-meter/quiz)
* [quiz answers](/microbit/lessons/love-meter/quiz-answers)
* [challenges](/microbit/lessons/love-meter/challenges)


## Prior learning/place of lesson in scheme of work

Learn how to use the **pin pressed**, `on pin pressed` to run code when the user holds the GND pin with one hand, and presses pin 0 with the other hand, thus completing a circuit. We will be learning how to create a love meter using input on pin pressed, a local variable, math random, If (conditional) as well as simple commands, such as show number, pause, and show string.

## Documentation

```cards
if (true) {}
input.onPinPressed(TouchPin.P0, () => {})
let x = 0
Math.random(3)
basic.showNumber(0)
basic.pause(100)
```