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- /*
- * 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);
- }
-
-
-
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