Goal

The goal is to build a small equipment that can:

Control a music teleprompter on a computer (replace a keyboard).
Control a music amps

This project is a merge of several project I found on a web.

Required items

2 diodes 1N4148, example: Here
1 ATmega32U4 (since you need the keyboard capability), example: Here
3 Foot Switch, example: Here
3 resitors 10K and 1 resistor 220
Optional: 3 Leds to find the button eaqsily with the foot if you plan to use the device in dark room
A stereo Female Jack socket, found it in all the good music shop
Few wires to connect all this, example Here
A box to host the system, example: Here

Improvement

Add a wireless capability for the control of the music teleprompter via Bluetooth based on This

Step 1: The Wiring

Step 2: The Code

This is the code for the Arduino. It is sending F2, F3 and F4 to the computer. You can change this based on the software you use as a teleprompter.

You can also adjust the speed of the letter by changing the delay.

int keys[] = {2,3,4};
int pinCount = 3;
int pinLed = 5;
void setup() {
 // put your setup code here, to run once:
 Keyboard.begin(); // setup keyboard
 for (int i = 0; i < pinCount; ++i) {
 // initilize pins
 pinMode(keys[i], INPUT);
 }
  pinMode(pinLed, OUTPUT);
}
void loop() {
  digitalWrite(pinLed, HIGH);
 // put your main code here, to run repeatedly:
 for (int i = 0; i < pinCount; ++i) {
 // check buttons
 if(readButton(keys[i])) {
 doAction(keys[i]); 
 }
 }
 delay(100);
}
boolean readButton(int pin) {
 // check and debounce buttons
 if (digitalRead(pin) == HIGH) {
  delay(100);
  if (digitalRead(pin) == HIGH) {
    return true;
  }
 }
 return false;
}
void doAction(int pin) {
 // perform tasks
 switch (pin) {
 case 2:
  // Keyboard.write(0x41);
  Keyboard.write(0xC5); 
  // 0xC2 -> F1
 break;
 case 3:
  // Keyboard.write(0x42);
  Keyboard.write(0xC4); 
  // 0xC3 -> F2
 break;
 case 4:
  // Keyboard.write(0x43);
  Keyboard.write(0xC3);  
  // 0xC4 -> F3
 break;
 }
}