/*
 ESP32 Keypad薄膜式(4x4)鍵盤 基本實習
 基本實習：
 按鍵->顯示按鍵值
*/
#include <Keypad.h> 
uint8_t row[4] = {27, 26, 25, 33}; // GIOP腳
uint8_t col[4] = {19, 18,  5, 17}; // GIOP腳 

char keys[4][4] = {
  {'1','2','3', 'A'},
  {'4','5','6', 'B'},
  {'7','8','9', 'C'},
  {'*','0','#', 'D'}
}; 
Keypad keypad = Keypad(makeKeymap(keys), row, col, 4, 4 );

void setup(){
  Serial.begin(115200);
  Serial.println("Hello Keypad!");
} 
void loop(){  
  char key = keypad.getKey();
  if (key) {                    //如果有按鍵，就印出key
    Serial.println(key);
  }
}