It is a pretty common first project to use an Arduino (or similar) to blink an LED. Which, of course, brings taunts of: you could have used a 555! You can, of course, also use any sort of oscillator, ...
4don MSNOpinion
How to turn off the flashing notification light on an iPhone
Is your iPhone's LED flashlight blinking every time you receive a call or a notification? You can turn it off by following a ...
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