#include <Keypad.h>
#define ROW_NUM 4 // quatro linhas
#define COLUMN_NUM 4 // quatro colunas
char keys[ROW_NUM][COLUMN_NUM] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
byte pin_rows[ROW_NUM] = {19, 18, 5, 17}; // GPIO19, GPIO18, GPIO5, GPIO17 conectados às linhas
byte pin_column[COLUMN_NUM] = {16, 4, 0, 2}; // GPIO16, GPIO4, GPIO0, GPIO2 conectados às colunas
Keypad keypad = Keypad( makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
void setup() {
Serial.begin(9600);
}
void loop() {
char key = keypad.getKey();
if (key) {
Serial.println(key);
}
}