A LED flashing briefly once every 5 seconds to imitate the indicator of a real alarm is the function of this dummy alarm project with the use of a 7555 timer IC. To prolong battery life, the circuit ...

Switching applications involving controlling devices or appliances using digital-I/O lines through a relay often need to indicate the change of state of the I/O line and, hence, the connected device.

While there are still some who, at the mention of the alarm clock, might think of a small, spring-driven, mechanical device topped by a couple of bells with a hammer between them, my generation would ...