#include <Keypad.h>
const byte ROWS = 4; // Number of rows on the keypad
const byte COLS = 4; // Number of columns on the keypad
char keys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
byte rowPins[ROWS] = {16, 4, 0, 2}; // Connect to the row pinouts of the keypad
byte colPins[COLS] = {19, 18, 5, 17}; // Connect to the column pinouts of the keypad
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
const int ledPin = 23; // Pin connected to the LED
void setup() {
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);
}
void loop() {
char key = keypad.getKey();
if (key == 'A') { // If 'ON' key is pressed
digitalWrite(ledPin, HIGH); // Turn LED on
} else if (key == 'B') { // If 'OFF' key is pressed
digitalWrite(ledPin, LOW); // Turn LED off
}
}