Some code for a teensy birthday present, to be used on mac os x Questions can be entered and should be answered correctly before a coupon code is displayed to the player. Possible improvement could be opening a screen session with the device through the terminal. In this case a session has to be opened by the user himself. Questions and answers …

Teensy bday present!

/* Simple USB Keyboard Example
   Teensy becomes a USB keyboard and types characters

   You must select Keyboard from the "Tools > USB Type" menu

   This example code is in the public domain.
*/

int count = 0;
boolean firstRun = false;
boolean questionShown = false;
int qNumber = 0;

char *questions[2] = {"Cryptische hint: Sing, sing, sing, start the party TCP-style!", "Cryptische hint: Give me a break (hex)!"};
char *answers[2]= {"antwoord1", "antwoord2"};

void setup() {
  Serial.begin(9600);
  delay(5000);
  pinMode(11, OUTPUT);
}

void loop() {
    if (firstRun) {
      Keyboard.set_modifier(MODIFIERKEY_RIGHT_GUI);
      Keyboard.set_key1(KEY_SPACE);
  
      Keyboard.send_now();
  
      delay(2000);
      Keyboard.println("Terminal");
      delay(1000);
      
      Keyboard.set_key1(KEY_ENTER);
      Keyboard.send_now();
      Keyboard.set_key1(0);
      Keyboard.send_now();
      
      digitalWrite(11, HIGH);
      
      delay(5000);
      Keyboard.println("say 'Happy Birthday to you!..'");
      digitalWrite(11, LOW);
  
      delay(1000);
      digitalWrite(11, HIGH);
      Keyboard.println("say -v 'Bruce' 'Happy Birthday to you!..'");
      digitalWrite(11, LOW);
  
      delay(1000);
      digitalWrite(11, HIGH);
      Keyboard.println("say -v 'Kathy' 'Happy Birthday Teensy Tony!..'");
      digitalWrite(11, LOW);
  
      delay(1000);
      digitalWrite(11, HIGH);
      Keyboard.println("say -v 'Alex' 'Happy Birthday to you!..'");
      digitalWrite(11, LOW);
  
      delay(2000);
      Keyboard.println("say -v 'Alex' 'In order to get your birthday present, open a screen session with this Teensy serial device at 9600 bauds'");
      delay(1000);
      Keyboard.println("say -v 'Kathy' 'Don't forget to set line ending to Carraige return, so you can provide us some correct answers!'");

    }
    firstRun = false;
    serialReader(questions[qNumber], answers[qNumber]);
}

void serialReader(const char* question, const char* answer) {
  int makeSerialStringPosition;
  int inByte;
  char serialReadString[50];
  const int terminatingChar = 13; //Terminate lines with CR

  if (!questionShown && qNumber < sizeof(&questions)) {
     Serial.print("question ");
     Serial.print(qNumber + 1);
     Serial.print(": ");
     Serial.println(question);
  }

  questionShown = true;
  inByte = Serial.read();
  makeSerialStringPosition=0;

  if (inByte > 0 && inByte != terminatingChar) { //If we see data (inByte > 0) and that data isn't a carriage return
    delay(100); //Allow serial data time to collect (I think. All I know is it doesn't work without this.)
    
    while (inByte != terminatingChar && Serial.available() > 0) { // As long as EOL not found and there's more to read, keep reading
      serialReadString[makeSerialStringPosition] = inByte; // Save the data in a character array
      makeSerialStringPosition++; //Increment position in array
      //if (inByte > 0) Serial.println(inByte); // Debug line that prints the charcodes one per line for everything recieved over serial
      inByte = Serial.read(); // Read next byte
    }

    if (inByte == terminatingChar) //If we terminated properly
    {
      serialReadString[makeSerialStringPosition] = 0; //Null terminate the serialReadString (Overwrites last position char (terminating char) with 0
      Serial.println(serialReadString);
      if (strcmp(serialReadString, answer) == 0) 
      {
        qNumber++;
        questionShown = false;
        Serial.println("Correct answer!");
        if (qNumber == sizeof(&questions)) {
          digitalWrite(11, HIGH);
          Serial.println("ACK!\n");
          Serial.println("Gelukkige verjaardag!");
          Serial.println("Je code is xxx");
          Serial.println("Please go here Please go here and type that in: https://www.sparkfun.com/gift_certificates/redeem");
          Serial.println("Van Daan, Linne, Jekke, Marie, Maarten, Ben, Borre, Ryan, Mathijs en Miet!!!\n");
        }
      } else {
        Serial.println("NAK!");
      }  
  }
  } 
}