Playground_TI.ino

#include <AcceleroMMA7361.h>

AcceleroMMA7361 accelero;
int x;
int y;
int z;

int accelState = 0;
int lastAccelState = 0;

long interval = 0;
long previousMillis = 0;

int peakValue = 0;
int threshold = 30;
int noise = 5;

void setup()
{
  Serial.begin(9600);
  Serial1.begin(31250); //MIDI serial
  accelero.begin(13, 12, 11, 10, A0, A1, A2);
  accelero.setARefVoltage(3.3);                   //sets the AREF voltage to 3.3V
  accelero.setSensitivity(HIGH);                  //sets the sensitivity to +/-6G
  accelero.calibrate();
}

void loop()
{
  unsigned long currentMillis = millis();

  //Seesaw
  y = accelero.getYAccel();
  //Swing
  int stretchSensorLow = analogRead(A6) - 330;
  int stretchSensor = map(stretchSensorLow, 0, 40, 20, 127);
 
  //  interval = stretchSensor;
  int thisNote = y + 48;
   Serial.println(thisNote);
  int thisCommand = 0;

  //** Peak Detection
  if (stretchSensor > peakValue) {
    peakValue = stretchSensor;
    if (currentMillis - previousMillis >= interval) {
      previousMillis = currentMillis;
      unsigned int thres = lastAccelState - y; 
      if (y != lastAccelState) {
        thisCommand = 0x90;
      } else {
        thisCommand = 0x80;
      }
      midiCommand(thisCommand, thisNote, stretchSensor); // for changing Velocity with stretch sensor value

    }
    lastAccelState = y;
  }

  //Peak detection initialize
  if (stretchSensor <= threshold - noise) {
    if (peakValue > threshold + noise) {
      //      Serial.println(peakValue);
      peakValue = 0;
    }

  }

  /*
    //Pitch Bend
    if (stretchSensor > 10 ) {
      byte msb = highByte(stretchSensor << 1);   // high bits
      byte lsb = lowByte(stretchSensor);         // low bits
      bitWrite(lsb, 7, 0);
      midiCommand(0xE0, lsb, msb);           //pitch bend message
    }
  */

  //Change Instrument
  if (stretchSensor > 100) {
    midiCommand(0xC0, 0, 10); // program (change instrumnet (Command, Control#,ControlValue-1)
  }

}

// send a 3-byte midi message
void midiCommand(byte cmd, byte data1, byte  data2) {
  Serial1.write(cmd);     // command byte (should be > 127)
  Serial1.write(data1);   // data byte 1 (should be < 128)
  Serial1.write(data2);   // data byte 2 (should be < 128)
}