Logic Gate Implementation

Solving Approach

How do you plan to solve it?

•  Two switches are connected between Ground and 5V, and connected to Arduino pins 0 and 1 which are declared as INPUT_PULLUP.
• Four logic gates (AND, OR, NAND, NOR) are represented using LEDs connected in series with 330 Ohm resistors.
• Each LED-resistor pair is connected between a digital output pin and Ground.
• The digital pins are declared as OUTPUT, and the program controls them based on the input switch states to simulate the logic gate outputs.
   

Code

#define INPUTA 2
#define INPUTB 3

#define ORGATE     13
#define ANDGATE    12
#define NORGATE    11
#define NANDGATE   10

void setup() {
  pinMode(INPUTA, INPUT_PULLUP);
  pinMode(INPUTB, INPUT_PULLUP);

  pinMode(ORGATE, OUTPUT);
  pinMode(ANDGATE, OUTPUT);
  pinMode(NORGATE, OUTPUT);
  pinMode(NANDGATE, OUTPUT);
}

void loop() {
  int inputA = !digitalRead(INPUTA);
  int inputB = !digitalRead(INPUTB);

  digitalWrite(ORGATE, inputA || inputB);
  digitalWrite(ANDGATE, inputA && inputB);
  digitalWrite(NORGATE, !(inputA || inputB));
  digitalWrite(NANDGATE, !(inputA && inputB));
}

Output

Video

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