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What is Arduino | Getting started

Here's the new description with all links and additional text removed: Order your pcb design at JLCPCB: $2 for 10pcs PCBs (24 ...
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Arduino Library to implement a CountDown clock (in software polling, no hardware timer).

The CountDown library is a clock that counts down from a given time to zero, like an hour glass. It does not call any function or so when reaching zero as the user is responsible to check the time ...