#include <Keypad.h>
#define ROW_NUM 4 // quatro linhas
#define COLUMN_NUM 3 // quatro colunas
char keys[ROW_NUM][COLUMN_NUM] = {
{'1', '2', '3'},
{'4', '5', '6'},
{'7', '8', '9'},
{'*', '0', '#'}
};
byte pin_rows[ROW_NUM] = {18, 5, 17, 16}; // GPIO18, GPIO5, GPIO17, GPIO16 conectados à linhas
byte pin_column[COLUMN_NUM] = {4, 0, 2}; // GPIO4, GPIO0, GPIO2 conectados à 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);
}
}