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65 lines
2.1 KiB
65 lines
2.1 KiB
/*
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* Computer Switchboard
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*
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* Because interfacing with computers should be fun
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* and a keyboard is not enough.
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*
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* Let's turn a computer into an airplane (interface wise).
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*
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*/
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/*
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DigitalReadSerial
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Reads a digital input on pin 2, prints the result to the serial monitor
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This example code is in the public domain.
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*/
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// digital pin 2 has a pushbutton attached to it. Give it a name:
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int pushButton = 9;
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// the setup routine runs once when you press reset:
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void setup() {
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// initialize serial communication at 9600 bits per second:
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Serial.begin(9600);
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// make the pushbutton's pin an input:
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// I was somewhat confused about this. I thought maybe it would be an output
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// to ground, through the resistor, and it would only conduct when grounded, but
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// using the input pullup works. I'm not sure if you can detect when an output grounds or is conducting...
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pinMode(pushButton, INPUT_PULLUP);
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//https://stackoverflow.com/questions/6160963/how-can-i-digitalread-a-pin-that-is-in-pinmode-output
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//https://forum.arduino.cc/index.php?topic=183977.0
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//This approach doesn't work as you can't read a floating pin reliably
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//so don't do it. It always reads zero, or will read noise.
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//pinMode(pushButton, OUTPUT);
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//digitalWrite(3,HIGH);
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//interestingly, you could use a shunt resistor... but more complex
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//https://arduino.stackexchange.com/questions/14647/how-can-i-detect-a-disconnected-pin
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delay(100);
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}
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// the loop routine runs over and over again forever:
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void loop() {
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// easy way
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// read the input pin:
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// int buttonState = digitalRead(pushButton);
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// print out the state of the button:
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// Serial.println(buttonState);
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delay(10); // delay in between reads for stability
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int resultb = 0;
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resultb = PINB;
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Serial.println(resultb,BIN); //noisy, but reads 0 when low.
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// Serial.println(bitRead(PORTB,1));// PORTB is for high or low
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// PIN is for reading input. PORTB doesn't work here.
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// https://arduino.stackexchange.com/questions/14647/how-can-i-detect-a-disconnected-pin
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// not sure what that link is on about, regarding port usage.
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delay(100);
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}
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