Introduction: The OR Gate With Arduino

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About: An Electrical Engineering Teacher in Athens Greece. Most of these small projects here, are constructed for enhancing the learning of the use of Arduino as well as basic electricity and electronics for students…

/*Arduino_OR_Logic_Gate.
Actually the circuit connection is the same as the previous AND...just a small change and thats all.
In 3 states there is an output to the LED ...try it and confirm the truth table below.

|A|B|Y|
|0|0|0|
|1|0|1|
|0|1|1|
|1|1|1|
*/

int buttonPin1 = 2;
int buttonPin2 = 3;
int LEDred = 8;
int buttonStatus1 = 0;
int buttonStatus2 = 0;

void setup() {
pinMode(LEDred, OUTPUT);
pinMode(buttonPin1, INPUT);
pinMode(buttonPin2, INPUT);
}

void loop(){
buttonStatus1 = digitalRead(buttonPin1);
buttonStatus2 = digitalRead(buttonPin2);

// check if the either the first button is HIGH, OR the second button is HIGH, then turn on the LED
// else turn the LED off
if (buttonStatus1 == HIGH || buttonStatus2 == HIGH )
{ digitalWrite(LEDred, HIGH);
} else { digitalWrite(LEDred, LOW); }
}