Thư viện i2cKeypad cho module Keypad và hướng dẫn sử dụng

 /* @file CustomKeypad.pde || @version 1.0 || @author Alexander Brevig || @contact alexanderbrevig@gmail.com || || @description || | Demonstrates changing the keypad size and key values. || # Use with I2C i/o G. D. (Joe) Young Feb 28/12 */ #include <Keypad_I2C.h> #include <Keypad.h> // GDY120705 #include <Wire.h> #define I2CADDR 0x20 const byte ROWS = 4; //four rows const byte COLS = 4; //four columns //define the cymbols on the buttons of the keypads char hexaKeys[ROWS][COLS] = { {'1','2','3','A'}, {'4','5','6','B'}, {'7','8','9','C'}, {'*','0','#','D'} }; byte rowPins[ROWS] = {3, 2, 1, 0}; //connect to the row pinouts of the keypad byte colPins[COLS] = {7, 6, 5, 4}; //connect to the column pinouts of the keypad //initialize an instance of class NewKeypad Keypad_I2C customKeypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS, I2CADDR); void setup(){ // Wire.begin( ); customKeypad.begin( ); // GDY120705 Serial.begin(9600); } void loop(){ char customKey = customKeypad.getKey(); if (customKey != NO_KEY){ Serial.println(customKey); } }

/* @file CustomKeypad.pde

|| @version 1.0

|| @author Alexander Brevig

|| @contact alexanderbrevig@gmail.com

|| @description

|| | Demonstrates changing the keypad size and key values.

|| #

Use with I2C i/o G. D. (Joe) Young Feb 28/12

#include <Keypad_I2C.h>

#include <Keypad.h> // GDY120705

#include <Wire.h>

#define I2CADDR 0x20

constbyteROWS=4;//four rows

constbyteCOLS=4;//four columns

//define the cymbols on the buttons of the keypads

charhexaKeys[ROWS][COLS]={

{'1','2','3','A'},

{'4','5','6','B'},

{'7','8','9','C'},

{'*','0','#','D'}

};

byterowPins[ROWS]={3,2,1,0};//connect to the row pinouts of the keypad

bytecolPins[COLS]={7,6,5,4};//connect to the column pinouts of the keypad

//initialize an instance of class NewKeypad

Keypad_I2CcustomKeypad(makeKeymap(hexaKeys),rowPins,colPins,ROWS,COLS,I2CADDR);

voidsetup(){

// Wire.begin( );

customKeypad.begin();// GDY120705

Serial.begin(9600);

}

voidloop(){

charcustomKey=customKeypad.getKey();

if(customKey!=NO_KEY){

Serial.println(customKey);

}

Arduino	module mở rộng IO PCF8574
5V	VCC
GND	GND
A4	SDA
A5	SCL

Hướng dẫn sử dụng module Keypad 4×4 với thư viện i2cKeypad

Thư viện i2cKeypad

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