/***********HOBGOB ECLECTRONICS BeatSneaks code**************/

/*This code sends MIDI messages using electrical pulses from FSRs (Force Sensitive Resistors) placed in the heels and toes of a pair of sneakers.
It has been adapted from code by todbot, ladyada, spikenzielabs, and mschaff (ardrumo) - special thanks to X (wxs.ca)

You'll need to grab the Serial-MIDI Converter from spikenzielabs.com */
/************************************************************/

#define HEELTHRESHOLD 450
#define TOETHRESHOLD 350
#define LOWERHEELTHRESHOLD 150
#define LOWERTOETHRESHOLD 101   // We're setting both a lower and an upper threshold for the FSRs, so that they will only trigger a MIDI message when we actually want them too.
#define HEEL1PIN 0
#define HEEL2PIN 1
#define TOE1PIN 2
#define TOE2PIN 3 
#define EXTRAPIN1 4
#define EXTRAPIN2 5              // Define which analog in pins on the arduino we'll be using
int LEDpin = 13;                           // Connect LED to pin 13
int pinNote[6] = {78,65,88,59,41,42};      // This array stores the different MIDI notes that each pin is assigned
boolean heel1 = false;
boolean heel2 = false;
boolean toe1 = false;
boolean toe2 = false;                      //These variables will help us to make sure we don't send multiple MIDI messages per single hit        

void setup(void) {
  Serial.begin(57600);                     // We'll send debugging information to the Serial monitor
  pinMode(LEDpin, OUTPUT);
}

void loop(void) {                                                                                                                  // This is the main function that executes all the others.
	heel1 = sender(analogRead(HEEL1PIN), HEEL1PIN, pinNote[HEEL1PIN], "HEEL1", heel1, HEELTHRESHOLD, LOWERHEELTHRESHOLD);

        heel2 = sender(analogRead(HEEL2PIN), HEEL2PIN, pinNote[HEEL2PIN], "HEEL2", heel2, HEELTHRESHOLD, LOWERHEELTHRESHOLD);
       
        toe1 = sender((analogRead(TOE1PIN)+100), TOE1PIN, pinNote[TOE1PIN], "TOE1", toe1, TOETHRESHOLD, LOWERTOETHRESHOLD);
      
        toe2 = sender((analogRead(TOE2PIN)+100), TOE2PIN, pinNote[TOE2PIN], "TOE2", toe2, TOETHRESHOLD, LOWERTOETHRESHOLD);         // We add some extra punch to the toe readings so that they'll sound about as loud as the heel
}

void midimsg(unsigned char message, unsigned char pitch, unsigned char velocity) {    // This function sends a MIDI message with a message, pitch, and velocity
    Serial.print(message);
    Serial.print(pitch);
    Serial.print(velocity);
}

boolean sender(int reading, int pin, int note, char msg[], boolean press, int threshold, int lowerthreshold ) {   // This function is what does all the work
  if(reading >= threshold) {                                                                                      // If the user stomps harder than a certain threshold...
    if(!press) {                                                                                                  // and if the sensor is not already in 'pressed' mode...
        reading = reading/8 - 1;                                                                                  // convert the FSR reading to a MIDI-friendly value
	digitalWrite(LEDpin, HIGH);      
	midimsg(144, note, reading);                                                                              // Send a MIDI message
	Serial.println(msg);                                                                                      // Send a unique debug message to the Serial monitor
        delay(30);
        digitalWrite(LEDpin, LOW);
     }  press = true;                                                                                             // The sensor is now in 'pressed' mode,
   } else if(reading <= lowerthreshold) {                                                                         // once the applied force sinks below the lower threshold...
		press = false;                                                                                    // the sensor is no longer in 'pressed' mode
        }
   return press;
}