Got few LEDs laying around? Why not use them to make a 4x4x4 LED cube with the help of Arduino?
Project tutorial by Mission Critical
Literally the simplest way to make a weather station!
tutorial on how to use UltraSonic Sensor with Arduino Board
by Mission Critical
i think using arduino along with this circuit is not the most efficient way, use raspberry pi itself for turning the siren / LED, but honestly, overall this is just stunning project! thanks a lot for sharing! Cheers!
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