78 lines
3.1 KiB
Markdown
78 lines
3.1 KiB
Markdown
# Code
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Have you ever tried making beat box sounds? Let's try making a beatbox with code and, yes, a banana!
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## Code the banana key
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Start by adding a variable to store a musical note. Rename the variable to `sound`. Set the value of the variable to the note block `Middle A` from the **Music** drawer.
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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 when the fruit connected to a pin pressed. So, we register an event handler that executes whenever pin **1** is pressed. Pin **1** is, of course, connected to the banana. Add a ``||input:on pin pressed||`` block from the **Input** drawer.
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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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Now, let's create some notes to play when the banana is pressed. Click on the **Loops** drawer then insert a ``||loops:repeat||`` loop into the ``||input:on pin pressed||`` block. Click on the **Variables** drawer and pull out a ``||variables:change item by||`` block and put it into the loop. Rename the variable to `sound`. Change the value from `1` to `25`. This will increase the variable `sound` from the note frequency of block `Middle A` to `Middle A` plus 25 and so on. Put a ``||variables:set to||`` block for `sound` right after the loop. Set it to `Middle A` a in order to reset the sound after a banana press.
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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 += 25;
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}
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sound = music.noteFrequency(Note.A);
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});
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```
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Finally, insert a ``||music:play tone||`` above the ``||variables:change by||``. Pull out the ``sound`` variable block and drop it in the note slot of ``||music:play tone||``. Change the beat fraction from `1` to `1/4`.
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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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music.playTone(sound, music.beat(BeatFraction.Quarter));
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sound += 25;
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}
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sound = music.noteFrequency(Note.A);
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});
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```
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Click `|Download|` and try a banana press. Did you hear 4 notes play?
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## Add another banana key
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Go back to **[Make](/projects/banana-keyboard/make)** and repeat steps 7 and 8 with another banana but this time connect the crocodile clip to pin **3**.
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Duplicate the ``||input:on pin pressed||`` event handler to make a second one. For the new ``||input:on pin pressed||``, change the pin name to **P2**. In the pin **P2** event, let's have the the frequency in the variable `sound` decrease by 25 instead of having it increase. Change the `25` in the ``||variables:change by||`` block to `-25`. OK, your code now 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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music.playTone(sound, music.beat(BeatFraction.Quarter));
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sound += 25;
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}
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sound = music.noteFrequency(Note.A);
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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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music.playTone(sound, music.beat(BeatFraction.Quarter));
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sound += -25;
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}
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sound = music.noteFrequency(Note.A);
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});
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```
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Click `|Download|` again and play both bananas. It's a fruit jam session!
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