Wouldn’t it be nice to wake up your brother or sister using an alarm you build yourself, triggered by natural sunlight? The happy news is now you can, using your Flashlight Laser Tag circuit you already built!

Since your circuit is already sensitive to light, you can transform it easily into an alarm clock that will buzz or light up when hit by the sun’s rays.

Note – you can also use your Laser Door Alarm for this as well, since it’s also triggered by light. However, the Burglar Alarm will not work, because it gets triggered by darkness, so unless you want your alarm to sound just as your drifting off to sleep, you’ll want to use the Laser Door Alarm or the Flashlight Laser Tag circuit. Here’s what you need to know (it’s really simple…):

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