Bàn Phím Ma Trận Mềm 3x4 Keypad

————————CODE THAM KHẢO———————-

Thư viện Keypad.h

//3x4 Arduino// 1 - 2// 2 - 3// 3 - 4// 4 - 5// 5 - 6// 6 - 7// 7 - 8//Nạp code mở Serial Monitor chọn No line ending, baud 9600.#include "Keypad.h"const byte Rows= 4; //number of rows on the keypad i.e. 4const byte Cols= 3; //number of columns on the keypad i,e, 3//we will definne the key map as on the key pad:char keymap[Rows][Cols]={{'1', '2', '3'},{'4', '5', '6'},{'7', '8', '9'},{'*', '0', '#'}};byte rPins[Rows]= {8,7,6,5}; //Rows 0 to 3byte cPins[Cols]= {4,3,2}; //Columns 0 to 2// command for library forkeypad//initializes an instance of the Keypad classKeypad kpd= Keypad(makeKeymap(keymap), rPins, cPins, Rows, Cols);void setup(){ Serial.begin(9600); // initializing serail monitor}//If key is pressed, this key is stored in 'keypressed' variable//If key is not equal to 'NO_KEY', then this key is printed outvoid loop(){ char keypressed = kpd.getKey(); if (keypressed != NO_KEY) {Serial.println(keypressed); }}