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Roland.ino
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Roland.ino
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/***************************************
* *
* *
* Roland, the Headless MIDI Drummer *
* *
* *
**************************************/
// Include the motor shield
#include <Wire.h>
#include <MIDI.h>
#include <Adafruit_MotorShield.h>
#include "utility/Adafruit_PWMServoDriver.h"
// Initiate Motorshields.
Adafruit_MotorShield AFMS0 = Adafruit_MotorShield( 0x60 );
Adafruit_MotorShield AFMS1 = Adafruit_MotorShield( 0x61 );
// Declare pointers to motors.
Adafruit_DCMotor *kickMotor = AFMS0.getMotor( 1 );
Adafruit_DCMotor *snareMotor = AFMS0.getMotor( 2 );
Adafruit_DCMotor *tom1Motor = AFMS0.getMotor( 4 );
Adafruit_DCMotor *tom2Motor = AFMS0.getMotor( 3 );
Adafruit_DCMotor *crashMotor = AFMS1.getMotor( 1 );
Adafruit_DCMotor *rideMotor = AFMS1.getMotor( 2 );
Adafruit_DCMotor *hihatMotor = AFMS1.getMotor( 3 );
Adafruit_DCMotor *cowbellMotor = AFMS1.getMotor( 4 );
Adafruit_DCMotor *currentMotor;
// Timestamps for note ON.
int kickHitTime = -1;
int snareHitTime = -1;
int hihatHitTime = -1;
int tom1HitTime = -1;
int tom2HitTime = -1;
int crashHitTime = -1;
int rideHitTime = -1;
int cowbellHitTime = -1;
const int modulusValue = 10000;
const int motorLimit = 100;
// Use variables for NOTE ON and OFF to simplify the usage of channels.
int midiChannel = 10; // Channel 10
// This is used as a "scaling value" to scale
// the speed to a proper motor speed value.
int speedFloor = 150;
void setup() {
// Initialize motor shields.
AFMS0.begin();
AFMS1.begin();
// Setup serial interface for MIDI.
MIDI.begin( midiChannel );
MIDI.setHandleNoteOn( handleNoteOn );
MIDI.setHandleNoteOff( handleNoteOff );
}
void loop() {
// Check and release motors that been running longer than limit.
kickHitTime = timeLimit( kickHitTime, kickMotor );
snareHitTime = timeLimit( snareHitTime, snareMotor );
hihatHitTime = timeLimit( hihatHitTime, hihatMotor );
tom1HitTime = timeLimit( tom1HitTime, tom1Motor );
tom2HitTime = timeLimit( tom2HitTime, tom2Motor );
crashHitTime = timeLimit( crashHitTime, crashMotor );
rideHitTime = timeLimit( rideHitTime, rideMotor );
cowbellHitTime = timeLimit( cowbellHitTime, cowbellMotor );
// Check for MIDI messages.
MIDI.read();
}
void handleNoteOn( byte channel, byte pitch, byte velocity ) {
if ( getMotor( pitch, true ) ) {
drum( velocity );
}
}
void handleNoteOff( byte channel, byte pitch, byte velocity ) {
if ( getMotor( pitch, false ) ) {
drum( 0 );
}
}
void drum( byte velocity ) {
if ( velocity > 0 ) { // HIT
int motorSpeed = map( (int) velocity, 0, 127, speedFloor, 255 );
currentMotor->setSpeed( motorSpeed );
currentMotor->run( FORWARD );
} else { // RELEASE
currentMotor->run( RELEASE );
}
}
boolean getMotor( byte pitch, boolean noteOn ) {
switch ( pitch ) {
case 0x24: // C1, Kick
currentMotor = kickMotor;
kickHitTime = getTime( noteOn );
break;
case 0x26: // D1, Snare
currentMotor = snareMotor;
snareHitTime = getTime( noteOn );
break;
case 0x29: // B1/C2/D2, Tom 2
case 0x2B:
case 0x2D:
currentMotor = tom1Motor;
tom1HitTime = getTime( noteOn );
break;
case 0x2F: // F1/G1/A1, Tom 1
case 0x30:
case 0x32:
currentMotor = tom2Motor;
tom2HitTime = getTime( noteOn );
break;
case 0x2A: // F#1, HiHat
currentMotor = hihatMotor;
hihatHitTime = getTime( noteOn );
break;
case 0x2E: // A#1, Open HiHat
currentMotor = hihatMotor;
hihatHitTime = getTime( noteOn );
break;
case 0x31: // C#2, Crash
currentMotor = crashMotor;
crashHitTime = getTime( noteOn );
break;
case 0x33: // D#2, Ride
currentMotor = rideMotor;
rideHitTime = getTime( noteOn );
break;
default: // Other, don't trigger any motors.
return false;
}
// Set motor should be triggered.
return true;
}
int timeLimit( int hitTime, Adafruit_DCMotor *myMotor ) {
// Check if drum has been triggered.
if ( hitTime > -1 ) {
int time = getTime( true );
int runTime = time - hitTime;
// Timestamp is less than current, set time to difference.
if ( time < hitTime ) {
runTime = time + modulusValue - hitTime;
}
// Has motor run longer than limit?
if ( runTime > motorLimit ) {
// Turn off the drum.
myMotor->run( RELEASE );
return -1;
}
}
return hitTime;
}
int getTime( boolean isOn ) {
if ( isOn ) {
return millis() % modulusValue;
} else {
return -1;
}
}