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

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# love meter blocks lesson
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create a love meter with the BBC micro:bit.
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### @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
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```docs
if (true) {
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}
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input.onPinPressed(TouchPin.P0, () => {
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})
let x = 0
Math.random(3)
basic.showNumber(0)
basic.pause(100)
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```