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.

The growing problem with traditional alarms and why mornings often feel harder than they should. How the Dreamzy Sunrise simulated sunrise wake-up LED alarm clock and mood light works to support a ...

This circuit simulates an alarm to discourage thieves and it is originally designed to be used on bicycles but can be used for cars too. It blinks a LED on and off thus simulating a real alarm circuit ...

If you are like me and need a couple of different alarm clocks to make sure you get out of bed in the morning, then you may want to check out this cool concept LED alarm clock. The Aphelion LED alarm ...