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

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);

}

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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