With the help of this relay, it is easy to energize other (external) high-power blinkers or beepers, if necessary. // PANIC ALARM - ARDUINO // // by T.K.Hareendran // int rlyPin = 12; // Relay Output ...

As the regular LEDs are too small to be noticeable, you can replace them with bigger LEDs or even a light bulb (paired with a relay for the Arduino Uno). Try a toggle switch instead, so you won't ...