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You've now increased the frequency at which the LED is flashing to faster than your eye can see. Try plugging the values you're using into the time = R*C equation.
4x4x4 interactive LED-cube with Arduino
Big Digit Backwards counting bluetooth Clock
Passive Speakers, Portable Speakers and more! Guide to buying parts for bluetooth speakers
DIY Butcher Block Kitchen Island
DIY Bluetooth Speaker
Drill press for ~$20
$30 High-Speed PCB Drill Press
Double-sided PCBs with a laser cutter
DIY Printed circuit board
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