【メロディーメイカー】ダンスホール

# 概要

子どもが楽しくプログラミングを学べるように作ったプロジェクトです。


## Mrs.GREEN APPLE 「ダンスホール」

<iframe width="333" height="592" src="https://www.youtube.com/embed/qY-kMSDMOo0" title="電子工作でダンスホール" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>

## ソースコード

```python:melody_maker.py
from machine import Pin, PWM
from utime import sleep

# LED
led_red = Pin(0, Pin.OUT, value=1)
led_green = Pin(2, Pin.OUT, value=1)
led_blue = Pin(3, Pin.OUT, value=1)
led_yellow = Pin(9, Pin.OUT, value=1)
led_white = Pin(10, Pin.OUT, value=1)

# NPNトランジスタのベース
buzzer = PWM(Pin(15))

# ボタン
button_red = Pin(1, Pin.IN, Pin.PULL_DOWN)
button_green = Pin(11, Pin.IN, Pin.PULL_DOWN)
button_blue = Pin(12, Pin.IN, Pin.PULL_DOWN)
button_yellow= Pin(13, Pin.IN, Pin.PULL_DOWN)
button_orange = Pin(14, Pin.IN, Pin.PULL_DOWN)


# 音の周波数
REST=    0
C4  =  262
Db4 =  277
D4  =  294
Eb4 =  311
E4  =  330
F4  =  349
Gb4 =  370
G4  =  392
Ab4 =  415
A4  =  440
Bb4 =  466
B4  =  494
C5  =  523
Db5 =  554
D5  =  587
Eb5 =  622
E5  =  659
F5  =  698
Gb5 =  740
G5  =  784
Ab5 =  831
A5  =  880
Bb5 =  932
B5  =  988
C6  = 1047
Db6 = 1109
D6  = 1175
Eb6 = 1245
E6  = 1319
F6  = 1397
Gb6 = 1480
G6  = 1568
Ab6 = 1661
A6  = 1760

# 光っているLEDを管理する変数
color = 0

def turn_on_led(color):
    """
    指定したLEDを点灯する。

    Parameters:
        color(int):
            0: 赤
            1: 緑
            2: 青
            3: 黄色
            4: 白
    """
    if color == 0:
        led_red.value(0)
    elif color == 1:
        led_green.value(0)
    elif color == 2:
        led_blue.value(0)
    elif color == 3:
        led_yellow.value(0)
    elif color == 4:
        led_white.value(0)
        
def turn_off_led(color):
    """
    指定したLEDを消灯する。
    
    Parameters:
        color(int):
            0: 赤
            1: 緑
            2: 青
            3: 黄色
            4: 白
    """
    if color == 0:
        led_red.value(1)
    elif color == 1:
        led_green.value(1)
    elif color == 2:
        led_blue.value(1)
    elif color == 3:
        led_yellow.value(1)
    elif color == 4:
        led_white.value(1)

def tone(frequency, duration):
    """
    パッシブブザーで音を鳴らす。

    Parameters:
        frequency(int): 周波数
        duration(float): 音の長さ
    """
    global color
    if frequency == REST:
        turn_on_led(0)
        turn_on_led(1)
        turn_on_led(2)
        turn_on_led(3)
        turn_on_led(4)
        sleep(duration)
        turn_off_led(0)
        turn_off_led(1)
        turn_off_led(2)
        turn_off_led(3)
        turn_off_led(4)
        return
    turn_on_led(color)
    buzzer.freq(frequency)
    buzzer.duty_u16(30000)
    sleep(duration)
    buzzer.duty_u16(0)
    sleep(0.002)
    turn_off_led(color)
    if color < 4:
        color += 1
    else:
        color = 0

```

```python:main.py
from melody_maker import *

def dancehall():
    """
    ダンスホール
    """
    BPM = 110
    BEAT = 60 / BPM
    melody = [
        [Gb5, BEAT/4],[REST, BEAT/4],[E5, BEAT/4],[REST, BEAT/4],[D5, BEAT/4],[REST, BEAT/4],
        [Gb5, BEAT/2],[REST, BEAT/2],[A5, BEAT*3/4],[D5, BEAT/4],[REST, BEAT/4],
        [D5, BEAT/4],[D5, BEAT/4],[D5, BEAT/4],[D5, BEAT/4],[REST, BEAT/4],[D5, BEAT/4],[REST, BEAT/4],
        [D5, BEAT/2],[REST, BEAT/2],[B4,BEAT*3/4],[A4, BEAT/4],[REST, BEAT/4],
        [Gb5, BEAT/4],[Gb5, BEAT/4],[Gb5, BEAT/4],[Gb5, BEAT/4],[Gb5, BEAT/4],[E5, BEAT/4],[D5, BEAT/4],
        [Gb5, BEAT/2],[REST, BEAT/2],[A5, BEAT/4],[A5, BEAT/2],[B5, BEAT*3/4],
        [A5, BEAT/2],[Gb5, BEAT/4],[E5, BEAT/4],[D5, BEAT/4],[B4, BEAT/4],
        [D5, BEAT/2],[REST, BEAT/2],[E5, BEAT*3/4],[D5, BEAT/2],[REST, BEAT/4],
        [D5, BEAT/4],[B4, BEAT/4],[D5, BEAT/4],[E5, BEAT/4],[Gb5, BEAT/4],[A5, BEAT/4],
        [D6, BEAT/2],[REST, BEAT/2],[E6, BEAT*3/4],[D6, BEAT/2],[REST, BEAT*1.5]
    ]
    for m in melody:
        tone(m[0], m[1])

while True:
    turn_on_led(color)
    if button_red.value() == 1:
        dancehall()
    elif button_green.value() == 1:
        pass
    elif button_blue.value() == 1:
        pass
    elif button_yellow.value() == 1:
        pass
    elif button_orange.value() == 1:
        pass
    sleep(0.1)
    turn_off_led(color)
    if color < 4:
        color += 1
    else:
        color = 0

```

## メロディーメイカーの作り方解説動画

https://youtu.be/d7pTfG6R1M8