Working Sign for Door, Just add LED'S inside....
thingiverse
My wife loved the sign I made for her, so kids know when to leave her alone. To create it, I soldered nine LEDs and an eight-pin PIC12F1822 microcontroller together. When you flip the switch, the PIC12F1822 pulses and flashes all nine LEDs in a synchronized pattern. The best part is that this little system only uses 12 milliamperes of power on average while flashing, allowing it to run for up to 150 hours before needing a new battery.
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