Last but certainly not least, the Teensy is the brains behind this operation, and without any code, these brains are completely empty! So here is some of that sweet sweet C language for all you nerds out there.

/* CONNECTIONS

TEENSY KONTROL
A0 photoresistor 1
A1 photoresistor 2
A2 photoresistor 3

*/

// the MIDI channel number to send messages
const int channel = 1;

// the MIDI continuous controller for each analog input
const int controller_n1 = 71; //LDR 1 
const int controller_n2 = 72; //LDR 2
const int controller_n3 = 73; //LDR 3

const int seuil = 30;

void setup() {

analogReadRes(12);// 12bit entree analogique
}

// store previously sent values, to detect changes
int previous_n1 = -1;
int previous_n2 = -1;
int previous_n3 = -1;

elapsedMillis msec = 0;

void loop() {
// only check the analog inputs 50 times per second,
// to prevent a flood of MIDI messages
if (msec >= 20) {
msec = 0;

int n1 = analogRead(A0);
int n2 = analogRead(A1);
int n3 = analogRead(A2);

//
//
//Serial.print(n1); Serial.print(' ');
//Serial.print(n2); Serial.print(' ');
//Serial.print(n3); Serial.print(' ');
//Serial.print(n4); Serial.print(' ');
//Serial.print(nLx); Serial.print(' ');
//Serial.print(nLy); Serial.print(' ');
//Serial.print(nRx); Serial.print(' ');
//Serial.println(nRy);

//delay(100);

 

 

// only transmit MIDI messages if analog input changed
if (abs(previous_n1 - n1) > seuil) {
if (n1 != previous_n1) {
int LDR_1= constrain((n1-seuil) / 32., 0, 127);
usbMIDI.sendControlChange(controller_n1, LDR_1, channel);
previous_n1 = n1;
}
}

if (abs(previous_n2 - n2) > seuil) {
if (n2 != previous_n2) {
int LDR_2= constrain((n2-seuil) / 32., 0, 127);
usbMIDI.sendControlChange(controller_n2, LDR_2, channel);
previous_n2 = n2;
}
}

if (abs(previous_n3 - n3) > seuil) {
if (n3 != previous_n3) {
int LDR_3= constrain((n3-seuil) / 32., 0, 127);
usbMIDI.sendControlChange(controller_n3, LDR_3, channel);
previous_n3 = n3;
}
}

}

// MIDI Controllers should discard incoming MIDI messages.
// http://forum.pjrc.com/threads/24179-Teensy-3-Ableton-Analog-CC-causes-midi-crash
while (usbMIDI.read()) {
// ignore incoming messages
// Credit: Jean Phillipe Pierre-Louis

}
}