TL;DR: In this project we simulate the behavior of an OR logic gate using an Arduino, two slide switches, and an LED in Ayantrik Lab. The switches act as inputs, the OR gate processes the logic, and the LED turns ON when any one of the inputs is HIGH, demonstrating the fundamental rule of OR logic.

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The Problem / Why This Matters

Digital electronics works using logic gates, which are the basic building blocks of all modern electronic systems.

Logic gates are used in:

• Computers
• Microcontrollers
• Embedded systems
• Robotics
• Digital circuits

Before learning advanced electronics, it is important to understand how basic gates work. One of the most important gates is the OR Gate. The OR gate produces an output when at least one input is ON (HIGH).

In this tutorial, we will simulate the OR gate using Ayantrik Lab, so we can see how digital inputs control the output without building the circuit physically.

Try it here

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Basic Theory of OR Gate

An OR Gate performs logical addition

• Two inputs (A and B)
• One output (Y)

The output becomes HIGH when any one of the inputs is HIGH.

Boolean Expression

Y = A + B

This means output is 1 when A = 1 OR B = 1.

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Truth Table of OR Gate

Explanation:

• If both inputs LOW → Output LOW
• If any input HIGH → Output HIGH
• If both HIGH → Output HIGH

In this project:

• Slide Switch 1 → Input A
• Slide Switch 2 → Input B
• OR Gate → Logic processor
• LED → Output indicator

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Prerequisites

Components used in this project:

• Arduino Uno
• 2 Slide Switches
• OR Gate
• LED

All components are available in Ayantrik Lab component library.

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Steps to Create the Project in Ayantrik Lab

1. Open a New Project

Open Ayantrik Lab and create a new project.

Create New Project

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2. Add Components

Click Add Components from the toolbar.

Toolbar

Search and drag the following components:

• Arduino Uno
• 2 Slide Switches
• OR Gate
• LED

Arrange them properly on the canvas.

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3. Make the Circuit Connections

OR Gate Connection

Slide Switch Connections

Switch 1:

• Right → 5V
• COM → D2

Switch 2:

• Right → 5V
• COM → D3

These switches act as digital inputs.

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Arduino to OR Gate

• D13 → OR Gate Input A
• D12 → OR Gate Input B

Arduino sends HIGH / LOW signals based on switch state.

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OR Gate to LED

• OR Gate Output (Y) → LED Anode
• LED Cathode → GND

LED shows the output of the OR gate.

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Code

Upload the following Arduino code.

cpp
View full codeCopy code
const int swt1 = 2;
const int swt2 = 3;

const int input1 = 12;
const int input2 = 13;

int swt1State = 0;
int swt2State = 0;

void setup() {

  pinMode(input1, OUTPUT);
  pinMode(input2, OUTPUT);

  pinMode(swt1, INPUT);
  pinMode(swt2, INPUT);

}

void loop() {

  swt1State = digitalRead(swt1);
  swt2State = digitalRead(swt2);

  if (swt1State == HIGH) {
    digitalWrite(input1, HIGH);
  } else {
    digitalWrite(input1, LOW);
  }

  if (swt2State == HIGH) {
    digitalWrite(input2, HIGH);
  } else {
    digitalWrite(input2, LOW);
  }

}

After writing the code, click Run from the toolbar to start the simulation.

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Expected Behavior

Try different switch positions.

This confirms the correct working of the OR logic gate.

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Built-in Debugging in Ayantrik Lab

Ayantrik Lab provides a built-in debugging system that helps you detect problems in both the circuit and the code.

Built-in debugging tool

The debugger can find issues such as:

• Wrong connections
• Missing power or ground
• Incorrect pin mapping
• Code errors

This makes learning digital electronics easier, especially for beginners.

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Conclusion

In this tutorial, we simulated an OR Gate using Arduino in Ayantrik Lab.

You learned:

• Basic digital logic theory
• Truth table of OR gate
• Using switches as inputs
• Controlling outputs using Arduino
• How logic gates work in real circuits

Logic gates are the foundation of all digital systems, and understanding them is essential before moving to advanced topics like:

• Flip-flops
• Counters
• Registers
• Microprocessors

Try building more logic circuits like:

• AND Gate
• NOT Gate
• NAND Gate
• XOR Gate

Happy learning with Ayantrik Lab!