Push Buttons — SIK Circuit 5

Use two push buttons for digital input. Learn about digitalRead(), pull-up resistors, and boolean logic (AND, OR, NOT) to control an LED.

ہدایات

Parts & Introduction

Push buttons are the simplest digital input. This experiment uses two buttons with an XOR logic gate: the LED turns on if you press either button, but turns off if you press both. You'll learn about digitalRead(), pull-up resistors, and boolean logic.

Parts Needed

1x Arduino Uno + USB cable
1x Breadboard
2x Push Buttons
1x LED (any color)
1x 330Ω Resistor
2x 10KΩ Resistors (pull-ups)
7x Jumper Wires

Hardware Hookup

Wiring Instructions

Place both push buttons across the center canyon of the breadboard.
Button 1: Connect one pin to GND. Connect the opposite diagonal pin to Arduino Digital Pin 2. Add a 10K resistor between Pin 2 and 5V (pull-up).
Button 2: Connect one pin to GND. Connect the opposite diagonal pin to Arduino Digital Pin 3. Add a 10K resistor between Pin 3 and 5V (pull-up).
Connect LED positive leg to Digital Pin 13, negative leg through 330Ω resistor to GND.

Note: The pull-up resistors hold the input HIGH when the button is not pressed. Pressing the button connects the pin to GND (LOW).

Arduino Code

Open the Arduino IDE and upload the following sketch to your Arduino board.

push_buttons.inoarduino

/*
SparkFun Inventor's Kit
Example sketch 05 — PUSH BUTTONS

Use pushbuttons for digital input.
LED on if pressing button 1 OR button 2, but not both (XOR).

Hardware connections:
  Button 1: one pin to GND, diagonal pin to digital pin 2
            10K pullup resistor between pin 2 and 5V
  Button 2: one pin to GND, diagonal pin to digital pin 3
            10K pullup resistor between pin 3 and 5V
  LED: positive to pin 13, negative through 330 ohm to GND

This code is completely free for any use.
*/

const int button1Pin = 2;
const int button2Pin = 3;
const int ledPin = 13;

void setup()
{
  pinMode(button1Pin, INPUT);
  pinMode(button2Pin, INPUT);
  pinMode(ledPin, OUTPUT);
}

void loop()
{
  int button1State, button2State;

  button1State = digitalRead(button1Pin);
  button2State = digitalRead(button2Pin);

  // XOR logic: on if either pressed, off if both pressed
  if (((button1State == LOW) || (button2State == LOW))
      && !
      ((button1State == LOW) && (button2State == LOW)))
  {
    digitalWrite(ledPin, HIGH);
  }
  else
  {
    digitalWrite(ledPin, LOW);
  }
}

Test & Experiment

What You Should See

The LED turns on when you press either button individually. It turns off when you press both buttons simultaneously (XOR logic).

Troubleshooting

Not responding: Push buttons are square — it's easy to put them in the wrong orientation. Try rotating 90°.
LED always on or always off: Check the pull-up resistor connections. Without them, the input pin floats and reads random values.

Experiments to Try

Change the logic to AND (both buttons required) or simple OR.
Use the buttons to control an RGB LED — one button for color, one for brightness.
Try using INPUT_PULLUP mode to eliminate the external resistors.

مواد

•SparkFun Inventor's Kit - V3.2 - 1 kitNOK 999.20
دیکھیں
•Arduino Uno R3 - 1 pieceپلیس ہولڈر
دیکھیں
•Breadboard - 1 pieceپلیس ہولڈر
دیکھیں
•Push Button - 2 piecessNOK 11.20
دیکھیں
•5mm LED - 1 pieceپلیس ہولڈر
دیکھیں
•330 Ohm Resistor - 1 pieceNOK 24.00
دیکھیں
•10K Ohm Resistor - 2 piecessNOK 24.00
دیکھیں
•Jumper Wires - 7 piecessNOK 39.20
دیکھیں

درکار اوزار

Computer with Arduino IDE

CC0 پبلک ڈومین

یہ بلیو پرنٹ CC0 کے تحت جاری کیا گیا ہے۔ آپ اجازت لیے بغیر اس کام کو نقل، ترمیم، تقسیم اور کسی بھی مقصد کے لیے استعمال کرنے کے لیے آزاد ہیں۔

میکر کی حمایت کریں ان کے بلیو پرنٹ کے ذریعے پروڈکٹس خرید کر جہاں وہ میکر کمیشن وینڈرز کی طرف سے مقرر، کماتے ہیں، یا اس بلیو پرنٹ کی نئی تکرار بنائیں اور آمدنی شیئر کرنے کے لیے اسے اپنے بلیو پرنٹ میں کنکشن کے طور پر شامل کریں۔

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