Logic Gate Implementation

September 20, 2025

Solving Approach

How do you plan to solve it?

Define Pins: At the start of your code, define the pin numbers for your inputs and outputs.

setup() function:

Use pinMode() to set the switch pins as INPUT_PULLUP (or INPUT if you use external pull-down resistors) and the LED pins as OUTPUT.

loop() function:

Continuously read the state of the two input switches using digitalRead(). Store these values in variables (e.g., inputA and inputB).

Implement the logic for each gate:

AND Gate: The LED should turn ON only if inputA is HIGH AND inputB is HIGH.

OR Gate: The LED should turn ON if inputA is HIGH OR inputB is HIGH (or both are HIGH).

NAND Gate: The LED should turn ON if the AND condition is NOT met. This is the inverse of the AND gate.

NOR Gate: The LED should turn ON if the OR condition is NOT met. This is the inverse of the OR gate.

Based on these conditions, use digitalWrite() to set the appropriate LED pin to either HIGH or LOW.

Code

/*Paste your code here*/
// Inside the loop() function
int inputA = digitalRead(inputPinA);
int inputB = digitalRead(inputPinB);
// AND Gate Logic
if (inputA == HIGH && inputB == HIGH) {
  digitalWrite(andGateLED, HIGH); // Turn the LED ON
  } else {
    digitalWrite(andGateLED, LOW); // Turn the LED OFF
    }

Output

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