MIDI(电子琴)

概述

用于播放乐符,可模拟电子琴等各种乐器演奏效果

技术参数

• 工作电压：VCC 3.3-5V
• 通讯方式：UART
• 集成功放、双声道喇叭
• 模块尺寸：24x46x7.5mm

引脚定义

VCC	电源
RXD	串口接收
TXD	串口发送
GND	地

使用教程

串口波特率：31250bps MIDI音符音色代码资料：

• MIDI音符代码表
• MIDI标准音乐码

Arduino示例

• Arduino midi库下载

#include <SoftwareSerial.h>
#include "vs1103b.h"


#define NOTE_C3 60
#define NOTE_D3 62
#define NOTE_E3 64
#define NOTE_F3 65
#define NOTE_G3 67
#define NOTE_A3 69
#define NOTE_B3 71
#define NOTE_C4 72
#define NOTE_D4 74
#define NOTE_E4 76
#define NOTE_F4 77
#define NOTE_G4 79
#define NOTE_A4 81
#define NOTE_B4 83

#define VELOCITY1   0x7F
#define VELOCITY2   0x00

uint8_t noteArr[14] = { 60, 62, 64, 65, 67, 69, 71, 72, 74, 76, 77, 79, 81, 83 };


Vs1103bClass vs1103b(A5, A4); //RX TX
;
void midiVolume(uint8_t vol);

void setup()
{
	vs1103b.begin();
	vs1103b.usartSendChannelMsg(CHANNEL0, MSG_CONTROL_CHANGE, DAT1_RESET, 0); //复位
	vs1103b.usartSendChannelMsg(CHANNEL0, MSG_CONTROL_CHANGE, DAT1_NOTE_OFF, 0); //关闭所有音
	midiVolume(180);  //音量设置
}

void loop()
{
	/*音调测试*/
	for (int i = 0; i < 14; i++)
	{
		vs1103b.usartSendChannelMsg(CHANNEL0, MSG_NOTE_OPEN, noteArr[i], 0x7F);
		delay(500);
		vs1103b.usartSendChannelMsg(CHANNEL0, MSG_NOTE_OPEN, noteArr[i], 0x00);
		delay(500);
	}

}

void midiVolume(uint8_t vol)
{
	vs1103b.usartSendChannelMsg(CHANNEL0, MSG_CONTROL_CHANGE, 0x07, vol);
	delay(2);
}

from microbit import *

#初始化
def midiInit(volume=127):
    i2c.write(0x0c, bytearray([0x01, 0x12, 0x7a]))         # set baudrate 31250
    sleep(2)
    i2c.write(0x0c, bytearray([0x02, 0xb0, 0x78, 0x00]))   # all sound off
    sleep(2)
    i2c.write(0x0c, bytearray([0x02, 0xb0, 0x79, 0x7f]))   # reset all controllers
    sleep(2)
    i2c.write(0x0c, bytearray([0x02, 0xb0, 0x07, volume])) # set volume
    sleep(10)

#设置音量(0-127)
def midiSetVolume(vol):
    i2c.write(0x0c, bytearray([0x02, 0xb0, 0x07, vol])) # set volume
    sleep(2)
    
# 选择乐器
def midiChangeProgram(channel, ins): # select instrument
    i2c.write(0x0c, bytearray([0x02, (0xC0|(channel & 0x0F)), ins]))
    sleep(2)

# 播放音调
def midiNoteOn(data1, data2=127, cmd=0x90):   
    i2c.write(0x0c, bytearray([0x02, cmd, data1, data2]))

# 停止音调播放
def midiNoteOff(data1, data2=0, cmd=0x80):
    i2c.write(0x0c, bytearray([0x02, cmd, data1, data2]))

# test code
midiInit()
midiChangeProgram(0,40)
midiSetVolume(40)
while True:
    ''' 
    #播放单个音调
    midiNoteOn(i)
    sleep(200)
    midiNoteOff(i)
    
    sleep(2000)
    '''
    
    #播放组合音调
    midiNoteOn(61)
    midiNoteOn(65)
    midiNoteOn(75)
    sleep(200)
    midiNoteOff(61)
    midiNoteOff(65)
    midiNoteOff(75)
    
    sleep(2000)