It is a 555 LED flashing circuit? Yep. How about a hex counter ... When [grandalf]’s friend showed them a project where a 555 timer was installed on an Arduino shield, they realized two things: ...

(Full bio) Using sirens and flashers on the top of the vehicles are now illegal all through India. In fact, even the prime minister of the country is not allowed to put a flasher on the top of the ...

So he set out to replicate this hack with that most cherished of ICs, the 555 timer ... LED stays off for. Ever the traditionalist, [Andrzej] wrapped up this build by etching his own PCB using ...