66 lines
2.5 KiB
Markdown
66 lines
2.5 KiB
Markdown
# banana keyboard blocks challenges
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control images with variables.
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## Before we get started
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Control images with variables.
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To create a new script, go to the [Create Code](/microbit/create-code) page and tap *New Project* under *Block Editor*.
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Have you ever tried to making beat box sounds? Let's try making a beatbox with code!
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We will register an event handler on the fruit that will execute when two things occur: first, the alligator clip attaches to GND and the other side of the alligator clip is inserted into a banana. Let's start by adding a variable where you can store data. Then rename the variable to "sound". Then set the value of the variable to the note block `A` from the Music drawer. Modify your code so that your code looks like this.
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```blocks
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let sound = music.noteFrequency(Note.A);
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```
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We want to play music on pin pressed in order to register an event handler that will execute whenever when you run a script and click pin 1 on the simulator. We must start by opening the Input drawer and adding `on pin pressed` P1. Modify your code so that your code looks like this.
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```blocks
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let sound = music.noteFrequency(Note.A);
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input.onPinPressed(TouchPin.P1, () => {
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})
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```
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We want to code the notes that will be played `on pin pressed`. We click on the Input drawer then insert a `for loop` that will increment by *i*. Click on the Variables drawer. Add `set item` block. Rename the variable block to "sound." Then add a Maths block to increase the variable sound from the note frequency of block `A` to `A` plus 25.Modify your code so that your code looks like this
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```blocks
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let sound = music.noteFrequency(Note.A);
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input.onPinPressed(TouchPin.P1, () => {
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for (let i = 0; i < 4; i++) {
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sound = sound + 25
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}
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})
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```
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* click *run* to see if the code works as expected.
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Let's include a second sound `on pin pressed` *P2*. To do this, you need to add the same blocks as the banana keyboard activity. However, you must change alter `on pin pressed` from P1 to P2. Additionally, you must *decrease* the frequency of the variable "sound" by 25. Modify your code so that your code looks like this. You will need to include a second banana to a alligator (spring) clip in the same procedure as the first activity.
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```blocks
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let sound = music.noteFrequency(Note.A);
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input.onPinPressed(TouchPin.P1, () => {
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for (let i = 0; i < 4; i++) {
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sound = sound + 25
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}
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})
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input.onPinPressed(TouchPin.P2, () => {
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for (let i = 0; i < 4; i++) {
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sound = sound - 25
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}
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})
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```
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* click *run* to see if the code works as expected.
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