MIDI模块(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：3.3V or 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

MIDI音符音色代码资料：

• MIDI音符代码表
• MIDI标准音乐码

Arduino示例

#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);
}

MicroPython示例

使用Bluebit主板控制MIDI模块中间需要加I2C转串口模块

from microbit import *

def midiInit(volume=0xb4):
    i2c.write(0x0c, bytearray([0x01, 0x12, 0x7a]))         # set baudrate 31250
    i2c.write(0x0c, bytearray([0x02, 0xb0, 0x79, 0x00]))   # reset
    i2c.write(0x0c, bytearray([0x02, 0xb0, 0x79, 0x7b]))   # close all
    i2c.write(0x0c, bytearray([0x02, 0xb0, 0x07, volume])) # set volume

def midiChangeProgram(channel, ins): # select instrument
    i2c.write(0x0c, bytearray([0x02, (0xC0|(channel & 0x0F)), ins]))

def midiNoteOn(data1, data2=50, cmd=0x90):
    i2c.write(0x0c, bytearray([0x02, cmd, data1, data2]))

def midiNoteOff(data1, data2=50, cmd=0x80):
    i2c.write(0x0c, bytearray([0x02, cmd, data1, data2]))

# test code
midiInit()
midiChangeProgram(0,41)
while True:
    midiNoteOn(69)
    sleep(500)
    midiNoteOff(69)
    sleep(500)