Name: 4×4 Membrane Keypad
Description: Lesson 54 of Adventure Kit: Pandora's Box
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4×4 Membrane Keypad
#include <Keypad.h>
 
const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns
 
char keys[ROWS][COLS] = {
  {'1','2','3', 'A'},
  {'4','5','6', 'B'},
  {'7','8','9', 'C'},
  {'*','0','#', 'D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad
 
//Create an object of keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
 
void setup(){
  Serial.begin(115200);
}
 
void loop(){
  char key = keypad.getKey();// Read the key
 
  // Print if key pressed
  if (key){
    Serial.print("Key Pressed : ");
    Serial.println(key);
  }
}