PIC, AVR, and Arduino are ubiquitous in projects these ... Instead of going with a microcontroller he built the circuit around a 555 timer. What he really needed in this case is a flip-flop ...

[Ed] was tasked with adding push-button degaussing to an arcade ... decoupling cap to power the new deguassing circuit and connected the SSR to the Arduino as an open collector input.

It's a gadget that will instantly order you a pre-programmed Domino's pizza with the push of a button. PiePal is ... uses a combination of an Arduino circuit board and Raspberry Pi — a credit ...