Mr. Vacerka
Thank you so much!!
I was relieved by the possibility of connection.
For your kind reply, I succeeded in connecting all 4 mpr121 sensors!!
One last problem I am facing is that "expand the number of touch buttons up to 24."
Every touch sensor gives me value of 0 to 11.
How can I make it to 0-11, 12-23, 24-35, 36-47 ?
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#include "SoftwareSerial.h"
//#define defaultPatch 15 //악기 초기화 버튼 설정 악기번호
SoftwareSerial mySerial(2, 3); //SW시리얼핀 정의 D3이 MIDI신호 전송용, D2는 미사용
byte note = 0; //The MIDI연주될 note(음계)
byte resetMIDI = 4; // VS1053 Reset용 핀
byte ledPin = 13; //MIDI 트래픽 표시용 LED
#include <Wire.h>
#include "Adafruit_MPR121.h"
#ifndef _BV
#define _BV(bit) (1 << (bit))
#endif
// You can have up to 4 on one i2c bus but one is enough for testing!
Adafruit_MPR121 cap = Adafruit_MPR121();
Adafruit_MPR121 cap2 = Adafruit_MPR121();
Adafruit_MPR121 cap3 = Adafruit_MPR121();
Adafruit_MPR121 cap4 = Adafruit_MPR121();
// Keeps track of the last pins touched
// so we know when buttons are 'released'
uint16_t lasttouched = 0;
uint16_t currtouched = 0;
uint16_t lasttouched2 = 0;
uint16_t currtouched2 = 0;
uint16_t lasttouched3 = 0;
uint16_t currtouched3 = 0;
uint16_t lasttouched4 = 0;
uint16_t currtouched4 = 0;
int btn[]={21, 23, 24, 26, 28, 29, 31, 33, 35, 36, 38, 40,
41, 43, 45, 47, 48, 50, 52, 53, 55, 57, 59, 60,
62, 64, 65, 67,69, 71, 72, 74, 76, 77, 79, 81,
83, 84, 86, 88, 89, 91, 93, 95, 96, 98, 100, 101};
byte byteData;
void setup() {
Serial.begin(9600);
mySerial.begin(9600);
while (!Serial) { // needed to keep leonardo/micro from starting too fast!
delay(10);
}
Serial.println("Adafruit MPR121 Capacitive Touch sensor test");
// Default address is 0x5A, if tied to 3.3V its 0x5B
// If tied to SDA its 0x5C and if SCL then 0x5D
if (!cap.begin(0x5A)) {
Serial.println("MPR121-A not found, check wiring?");
while (1);
}
Serial.println("MPR121-A found!");
//
if (!cap2.begin(0x5B)) {
Serial.println("MPR121-B not found, check wiring?");
while (1);
}
Serial.println("MPR121-B found!");
//
if (!cap3.begin(0x5C)) {
Serial.println("MPR121-C not found, check wiring?");
while (1);
}
Serial.println("MPR121-C found!");
//
if (!cap4.begin(0x5D)) {
Serial.println("MPR121-D not found, check wiring?");
while (1);
}
Serial.println("MPR121-D found!");
//Reset the VS1053
pinMode(resetMIDI, OUTPUT);
digitalWrite(resetMIDI, LOW);
delay(100);
digitalWrite(resetMIDI, HIGH);
delay(100);
// this is inside the loop so you can plug boards hot
// if you do not need hot plugin you may put it in setup()
cap.begin(0x5A);
cap2.begin(0x5B);
cap3.begin(0x5C);
cap4.begin(0x5D);
}
void loop() {
// Get the currently touched pads
currtouched = cap.touched();
currtouched2 = cap2.touched();
currtouched3 = cap3.touched();
currtouched4 = cap4.touched();
for (uint8_t i=0; i<48; i++) {
// it if *is* touched and *wasnt* touched before, alert!
if ((currtouched & _BV(i)) && !(lasttouched & _BV(i)) ) {
Serial.print(i); Serial.println(" touched");
// tone(0, btn[i],100);
noteOn(0, btn[i],100);
//tone(buzzerPin, frequency[i], 330);
}
//2///////////////////////////////////////////////////
if ((currtouched2 & _BV(i)) && !(lasttouched2 & _BV(i)) ) {
//when sensor is touched do something
Serial.print(i); Serial.println(" touched");
noteOn(0, btn[i],100);
}
//3///////////////////////////////////////////////////
if ((currtouched3 & _BV(i)) && !(lasttouched3 & _BV(i)) ) {
//when sensor is touched do something
Serial.print(i); Serial.println(" touched");
noteOn(0, btn[i],100);
}
//4///////////////////////////////////////////////////
if ((currtouched4 & _BV(i)) && !(lasttouched4 & _BV(i)) ) {
//when sensor is touched do something
Serial.print(i); Serial.println(" touched");
noteOn(0, btn[i],100);
}
}
// reset our state
lasttouched = currtouched;
lasttouched2 = currtouched2;
lasttouched3 = currtouched3;
lasttouched4 = currtouched4;
return;
//*************** MIDI LOOPBACK ******************//
if(Serial.available() > 0)
{
byteData = Serial.read();
mySerial.write( byteData);
}
}
//Send a MIDI note-on message. Like pressing a piano key
//channel ranges from 0-15
void noteOn(byte channel, byte note, byte attack_velocity) {
talkMIDI( (0x90 | channel), note, attack_velocity);
}
//Send a MIDI note-off message. Like releasing a piano key
void noteOff(byte channel, byte note, byte release_velocity) {
talkMIDI( (0x80 | channel), note, release_velocity);
}
//Plays a MIDI note. Doesn't check to see that cmd is greater than 127, or that data values are less than 127
void talkMIDI(byte cmd, byte data1, byte data2) {
digitalWrite(ledPin, HIGH);
mySerial.write(cmd );
mySerial.write(data1 );
//Some commands only have one data byte. All cmds less than 0xBn have 2 data bytes
//(sort of: http://253.ccarh.org/handout/midiprotocol/)
if( (cmd & 0xF0) <= 0xB0)
mySerial.write(data2 );
digitalWrite(ledPin, LOW);
}
