Step counter activity (#1216)

* added step-counter project

* added to summary
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Peli de Halleux
2018-09-12 08:16:22 -07:00
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# Step counter
![A @boardname@ attached on a foot](/static/mb/projects/step-counter.png)
This project turns the @boardname@ into a simple step-counter.
Each **shake** event increment a **counter** variable.
## ~ hint
If you built a watch in the [make](/projects/watch/make) portion of the of the [Watch](/projects/watch) project, you can use the code from this project with it too.
## ~
## A counter
To build a counter, we will need a variable to store the number of steps.
```blocks
let step = 0
step = 0
```
## Detecting a step
Assuming you attach the @boardname@ to your foot, it will get shaken up when do a step. We can use the ``||input:on shake||`` event to detect a step (it should work most of the time). Let's add the code to increment ``step`` by 1 when @boardname@ is shaken.
```blocks
let step = 0
input.onGesture(Gesture.Shake, function () {
step += 1
})
step = 0
```
## How many steps so far?
We want to see the number of steps at all time. In a ``||basic:forever||`` loop,
we add a ``||basic:show number||`` block to display the value of ``step``.
```blocks
let step = 0
input.onGesture(Gesture.Shake, function () {
step += 1
})
basic.forever(function() {
basic.showNumber(step)
})
step = 0
```
## Display lag
Did you notice there is a lag in the display of steps?
This is because the ``step`` value can change **while** the @boardname@ is displaying a number.
To remove the lag, add ``||led:stop animation||`` after changing the value of ``step``.
```blocks
let step = 0
input.onGesture(Gesture.Shake, function () {
step += 1
led.stopAnimation()
})
basic.forever(function() {
basic.showNumber(step)
})
step = 0
```