//The code for the transmitting Arduino follows:

const int sound1 = 8;

const int sound2 = 9;

const int sound3 = 10;

const int IRout = 7;

int lowTone;

int medTone;

int highTone;

int sound;

int timer;

void setup() {

pinMode (sound1, INPUT_PULLUP);

pinMode (sound2, INPUT_PULLUP);

pinMode (sound3, INPUT_PULLUP);

pinMode (IRout, OUTPUT); // to IR LED section

}

void loop() {

lowTone = digitalRead (sound1);

medTone = digitalRead (sound2);

highTone = digitalRead (sound3);

if (lowTone == LOW) {

sound = 1;

}

if (medTone == LOW) {

sound = 2;

}

if (highTone == LOW) {

sound = 3;

}

switch (sound) {

case 1:

while (timer < 10) {

tone (IRout, 38000);//outputs a short duration 38,000 tone

delay (2);

noTone (IRout);

delay (8); //total period 10 ms

timer = timer + 1;

}//sends 10 times

break;

case 2:

while (timer < 10) {

tone (IRout, 38000);

delay (2);

noTone (IRout);

delay (18); //period 20 ms

timer = timer + 1;

}

break;

case 3:

while (timer < 10) {

tone (IRout, 38000);

delay (2);

noTone (IRout);

delay (28); //period 30 ms

timer = timer + 1;

}

break;

}

sound = 0;

timer = 0;

}