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Push Buttons — SIK Circuit 5
Ed

Tạo bởi

Ed

17. tháng Ba 2026FI
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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.

Hướng dẫn

1

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

Vật liệu cho bước này:

SparkFun Inventors Kit - V3.2SparkFun Inventors Kit - V3.21 bộ
Arduino Uno R3Arduino Uno R31 cái
BreadboardBreadboard1 cái
Push ButtonPush Button2 cái
5mm LED5mm LED1 cái
330 Ohm Resistor330 Ohm Resistor1 cái
10K Ohm Resistor10K Ohm Resistor2 cái
Jumper WiresJumper Wires7 cái

Công cụ cần thiết:

Computer with Arduino IDE
2

Hardware Hookup

Wiring Instructions

  1. Place both push buttons across the center canyon of the breadboard.
  2. 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).
  3. 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).
  4. 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).

Vật liệu cho bước này:

Push ButtonPush Button2 cái
5mm LED5mm LED1 cái
330 Ohm Resistor330 Ohm Resistor1 cái
10K Ohm Resistor10K Ohm Resistor2 cái
BreadboardBreadboard1 cái
Jumper WiresJumper Wires7 cái
3

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);
  }
}

Vật liệu cho bước này:

Arduino Uno R3Arduino Uno R31 cái

Công cụ cần thiết:

Computer with Arduino IDE
4

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.

Vật liệu

8

Công cụ yêu cầu

1
  • 13
    Computer with Arduino IDE
Tổng ước tính
$153.00

You can swap these in

Can't get one of the materials? Swap it for an equivalent — these work just as well.

Recommended for this build

Products makers often use with builds like this one.

LED - RGB Diffused Common Cathode - 5mmFrequently used with this build's materials
Diode KitFrequently used with this build's materials
Piezo ElementUsed together and in similar builds
BC547 NPN Transistor (50-Pack)Frequently used with this build's materials
Jumper Wire Kit (350pcs, M-M / M-F / F-F)Frequently used with this build's materials
Servo MotorFrequently used with this build's materials
USB CableFrequently used with this build's materials
PotentiometerUsed together and in similar builds

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Using a Flex Sensor — SIK Circuit 9electronics/electromech1 shared material
Using Relays — SIK Circuit 13electronics/electromech1 shared material
Driving a Motor — SIK Circuit 12electronics/electromech1 shared material

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