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| #include <Wire.h>
#include <LiquidCrystal\_I2C.h>//点击这里会自动打开管理库页面: http://librarymanager/All#LiquidCrystal\_I2C
#include <Key.h>
#include <Keypad.h>
#include <Keypad\_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);//Address PCF8574 :A0 A1 A2-->VCC
#define I2CADDR 0x26 // Set the Address of the PCF8574 :A1 A2-->VCC;A0-->GND
const byte ROWS = 4; // Set the number of Rows
const byte COLS = 4; // Set the number of Columns
// 4×4矩阵键盘
char keys [ROWS] [COLS] = {
{'7', '8', '9', 'C'},
{'4', '5', '6', 'B'},
{'1', '2', '3', 'A'},
{'\*', '0', '#', 'D'}
};
// define active Pin (4x4)
byte rowPins [ROWS] = {0, 1, 2, 3}; // Connect to Keyboard Row Pin
byte colPins [COLS] = {4, 5, 6, 7}; // Connect to Pin column of keypad.
// makeKeymap (keys): Define Keymap
// rowPins:Set Pin to Keyboard Row
// colPins: Set Pin Column of Keypad
// ROWS: Set Number of Rows.
// COLS: Set the number of Columns
// I2CADDR: Set the Address for i2C
// PCF8574: Set the number IC
Keypad_I2C keypad (makeKeymap (keys), rowPins, colPins, ROWS, COLS, I2CADDR, PCF8574);
//void LCD\_display(void);
void setup () {
lcd.init();
lcd.backlight();
Wire .begin (); // Call the connection Wire
keypad.begin (makeKeymap (keys)); // Call the connection
Serial.begin (9600);
lcd.setCursor(2,0);
lcd.print("Key BUTTON");
}
void loop () {
char key = keypad.getKey (); // 获取按键
if (key) {
// Serial.println (key); // 串口输出
lcd.setCursor(0,1);//显示位置
lcd.print(key);
}
}
|
