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.
Instructions
Parts & Introduction
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
Material untuk langkah ini:
SparkFun Inventors Kit - V3.21 kit
Arduino Uno R31 buah
Breadboard1 buah
Push Button2 buah
5mm LED1 buah
330 Ohm Resistor1 buah10K Ohm Resistor2 buah
Jumper Wires7 buahTools needed:
Hardware Hookup
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).
Material untuk langkah ini:
Push Button2 buah5mm LED1 buah330 Ohm Resistor1 buah10K Ohm Resistor2 buahBreadboard1 buahJumper Wires7 buahArduino Code
Arduino Code
Open the Arduino IDE and upload the following sketch to your Arduino board.
/*
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);
}
}Material untuk langkah ini:
Arduino Uno R31 buahTools needed:
Test & Experiment
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_PULLUPmode to eliminate the external resistors.
Materials
8- $105.00
- 1 buahPlaceholder
- 1 buahPlaceholder
- 2 buah$2.00
- Placeholder
- $3.00
- $3.00
CC0 Public Domain
Cetak biru ini dirilis di bawah CC0. Anda bebas untuk menyalin, memodifikasi, mendistribusikan, dan menggunakan karya ini untuk tujuan apa pun, termasuk komersial, tanpa meminta izin.
Dukung Maker dengan membeli produk melalui Cetak Biru mereka di mana mereka mendapatkan Maker Commission yang ditetapkan oleh Penjual, atau buat iterasi baru dari Cetak Biru ini dan masukkan sebagai koneksi di milik Anda sendiri.