arduinoでAMラジオを鳴らす

概要

arduinoでAMラジオを鳴らしてみた。

写真

サンプルコード

#include "avr/pgmspace.h"

#define CLOCK       (1000000/8)
#define UA          1
#define SILO        2
#define DO          3
#define DOSH        4
#define RE          5
#define RESH        6
#define MI          7
#define FA          8
#define FASH        9
#define SO          10
#define SOSH        11
#define LA          12
#define SIFL        13
#define SI          14
#define DOHI        15
#define DOHS        16
#define REHI        17
#define REHS        18
#define MIHI        19
#define FAHI        20
#define FAHS        21
#define END         0x00
#define OFF         0x01
#define T03         3
#define T06         6
#define T09         9
#define NOTE        32
int radioPin = 11;
const unsigned char musicData[] PROGMEM = {
    DO, T03,
    FA, T03,
    FA, T09,
    FA, T03,
    MI, T03,
    RE, T03,
    DO, T03,
    RE, T09,
    DO, T03,
    DO, T03,
    UA, T03,
    DO, T03,
    RE, T06,
    RE, T03,
    RE, T03,
    RE, T03,
    FA, T03,
    RE, T03,
    MI, T06,
    UA, T03,
    OFF, T03,

    UA, T03,
    DO, T03,
    RE, T06,
    RE, T03,
    FA, T03,
    SO, T06,
    FA, T03,
    MI, T03,
    FA, T06,
    MI, T03,
    RE, T03,
    RE, T06,
    DO, T03,
    RE, T06,
    RE, T03,
    RE, T03,
    LA, T03,
    FA, T03,
    LA, T03,
    SO, T09,
    OFF,T03,

    DO, T03,
    FA, T09,
    FA, T03,
    FA, T03,
    MI, T03,
    RE, T03,
    DO, T03,
    RE, T09,
    DO, T03,
    DO, T03,
    UA, T06,
    DO, T03,
    RE, T03,
    RE, T06,
    RE, T03,
    RE, T03,
    FA, T03,
    RE, T03,
    MI, T03,
    UA, T06,
    OFF, T03,

    UA, T03,
    DO, T03,
    RE, T06,
    RE, T03,
    FA, T03,
    SO, T06,
    FA, T03,
    MI, T03,
    FA, T06,
    MI, T03,
    RE, T03,
    RE, T06,
    DO, T03,
    RE, T06,
    RE, T03,
    RE, T03,
    LA, T03,
    FA, T03,
    LA, T03,
    SO, T09,
    END,T03
};
void playTone(byte tone, byte tempo)
{
    int i,
        hz,
        itone;
    switch (tone)
    {
    case UA:
        hz = 466 / NOTE;
        itone = ((int) (CLOCK / 466)) << 3;
    break;
    case SILO:
        hz = 493 / NOTE;
        itone = ((int) (CLOCK / 493)) << 3;
    break;
    case DO:
        hz = 523 / NOTE;
        itone = ((int) (CLOCK / 523)) << 3;
    break;
    case DOSH:
        hz = 554 / NOTE;
        itone = ((int) (CLOCK / 554)) << 3;
    break;
    case RE:
        hz = 587 / NOTE;
        itone = ((int) (CLOCK / 587)) << 3;
    break;
    case RESH:
        hz = 622 / NOTE;
        itone = ((int) (CLOCK / 622)) << 3;
    break;
    case MI:
        hz = 659 / NOTE;
        itone = ((int) (CLOCK / 659)) << 3;
    break;
    case FA:
        hz = 698 / NOTE;
        itone = ((int) (CLOCK / 698)) << 3;
    break;
    case FASH:
        hz = 739 / NOTE;
        itone = ((int) (CLOCK / 739)) << 3;
    break;
    case SO:
        hz = 783 / NOTE;
        itone = ((int) (CLOCK / 783)) << 3;
    break;
    case SOSH:
        hz = 830 / NOTE;
        itone = ((int) (CLOCK / 830)) << 3;
    break;
    case LA:
        hz = 880 / NOTE;
        itone = ((int) (CLOCK / 880)) << 3;
    break;
    case SIFL:
        hz = 932 / NOTE;
        itone = ((int) (CLOCK / 932)) << 3;
    break;
    case SI:
        hz = 987 / NOTE;
        itone = ((int) (CLOCK / 987)) << 3;
    break;
    case DOHI:
        hz = 1046 / NOTE;
        itone = ((int) (CLOCK / 1046)) << 3;
    break;
    case DOHS:
        hz = 1108 / NOTE;
        itone = ((int) (CLOCK / 1108)) << 3;
    break;
    case REHI:
        hz = 1174 / NOTE;
        itone = ((int) (CLOCK / 1174)) << 3;
    break;
    case REHS:
        hz = 1244 / NOTE;
        itone = ((int) (CLOCK / 1244)) << 3;
    break;
    case MIHI:
        hz = 1318 / NOTE;
        itone = ((int) (CLOCK / 1318)) << 3;
    break;
    case FAHI:
        hz = 1396 / NOTE;
        itone = ((int) (CLOCK / 1396)) << 3;
    break;
    case FAHS:
        hz = 1480 / NOTE;
        itone = ((int) (CLOCK / 1480)) << 3;
    break;
    default:
        hz = 880 / NOTE;
        itone = ((int) (CLOCK / 880)) << 3;
    break;
    }
    for ( ; tempo > 0; tempo--)
    {
        if ((tone == OFF) || (tone == END))
        {
            delay(1000 / NOTE);
        }
        else
        {
            for (i = 0; i < hz; i++)
            {
                pinMode(radioPin, INPUT);
                delayMicroseconds(itone);
                pinMode(radioPin, OUTPUT);
                delayMicroseconds(itone);
            }
        }
    }
    delay(50);
}
void setup()
{
    pinMode(radioPin, OUTPUT);
    digitalWrite(radioPin, HIGH);
    TCCR2A = (1 << COM2A0) | (1 << WGM21);
    TCCR2B = (1 << CS00);
    OCR2A = 8 - 1;
}
void loop()
{
    unsigned int i;
    byte tone,
        tempo;
    i = 0;
    tone = OFF;
    while (tone != END)
    {
        tone = pgm_read_byte_near(musicData + i);
        i++;
        tempo = pgm_read_byte_near(musicData + i);
        i++;
        playTone(tone, tempo);
    }
}

以上。