3x4 Matrix Keypad: 두 판 사이의 차이

2025년 3월 27일 (목) 15:21 기준 최신판

It's a 3x4 numeric type keypad. The far-left and far-right pins are not used, leaving pins 1 to 7, starting from the left, for use.

You can check the pin numbers in the image provided.

[For example, pressing '1' on the keypad will output signals from pins 3 and 2.]

Specifications

Operating Voltage: 3 ~ 5V
Resistance: 10 ~ 150 ohms

Example Required Hardware

Arduino board
Jumper cables
3x4 keypad

Library

Keypad by Mark Stanley, Alexander Brevig (installable via the Library Manager)
Please refer to the Arduino library link for instructions on how to use the library.

Connection

keypad		Arduino
1		D7
2		D5
3		D8
4		D2
5		D6
6		D3
7		D4

example code

This code outputs to the serial monitor when a key on the keypad is pressed.

#include <Keypad.h>

const byte ROWS = 4;
const byte COLS = 3;

char keys[ROWS][COLS] = {
  { '1', '2', '3' },
  { '4', '5', '6' },
  { '7', '8', '9' },
  { '*', '0', '#' }
};

byte rowPins[ROWS] = { 5, 4, 3, 2 };
byte colPins[COLS] = { 8, 7, 6 };

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup(){
  Serial.begin(9600);
  Serial.println("Serial start");
}

void loop(){
  char key = keypad.getKey();

  if(key != NO_KEY){
      Serial.print(key);
  }
}

Execution Result

@@ 1번째 줄: / 1번째 줄: @@
-{{#seo:|title=아두위키 : 아두이노 3x4 키패드 가이드|title_mode=append|keywords=아두이노, 정보과학, 메이커학습, 수행평가, 3x4 키패드, 아두이노 작품, 캡스톤작품, 아두이노 예제코드|description=아두이노로 3x4 키패드를 제어하는 방법(기본정보, 회로, 예제 코드)을 소개합니다. 정보과학과 메이커수업에 활용가능합니다.}}
+{{#seo:|title=ArduWiki : Arduino 3x4 Keypad Guide|title_mode=append|keywords=Arduino, Computer Science, Maker Learning, Performance Assessment, 3x4 Keypad, Arduino Project, Capstone Project, Arduino Example Code|description=Introduces how to control a 3x4 keypad using Arduino (basic info, wiring, example code). Useful for computer science and maker classes.}}
 [[File:3X4키패드대표이미지.jpg|center|class=coders100]]
 It's a 3x4 numeric type keypad. The far-left and far-right pins are not used, leaving pins 1 to 7, starting from the left, for use.