/*
 * Computer Switchboard
 * 
 * Because interfacing with computers should be fun
 * and a keyboard is not enough.
 * 
 * Let's turn a computer into an airplane (interface wise).
 * 
 */
 
/*
  DigitalReadSerial
 Reads a digital input on pin 2, prints the result to the serial monitor

 This example code is in the public domain.
 */

// digital pin 2 has a pushbutton attached to it. Give it a name:
int pushButton = 9;

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
  // make the pushbutton's pin an input:
  // I was somewhat confused about this. I thought maybe it would be an output
  // to ground, through the resistor, and it would only conduct when grounded, but
  // using the input pullup works. I'm not sure if you can detect when an output grounds or is conducting...
  pinMode(pushButton, INPUT_PULLUP);
  
  
  //https://stackoverflow.com/questions/6160963/how-can-i-digitalread-a-pin-that-is-in-pinmode-output
  //https://forum.arduino.cc/index.php?topic=183977.0
  //This approach doesn't work as you can't read a floating pin reliably
  //so don't do it. It always reads zero, or will read noise.
  //pinMode(pushButton, OUTPUT);
  //digitalWrite(3,HIGH);
  //interestingly, you could use a shunt resistor... but more complex
  //https://arduino.stackexchange.com/questions/14647/how-can-i-detect-a-disconnected-pin
  
  
  delay(100);
}

// the loop routine runs over and over again forever:
void loop() {

  // easy way
  // read the input pin:
  // int buttonState = digitalRead(pushButton);
  // print out the state of the button:
  // Serial.println(buttonState);
  delay(10);        // delay in between reads for stability
  int resultb = 0;
  resultb = PINB;
  Serial.println(resultb,BIN); //noisy, but reads 0 when low.
  // Serial.println(bitRead(PORTB,1));// PORTB is for high or low
  // PIN is for reading input. PORTB doesn't work here.
  // https://arduino.stackexchange.com/questions/14647/how-can-i-detect-a-disconnected-pin
  // not sure what that link is on about, regarding port usage.
  delay(100);
}