Has arduino bt got a clock?
And if it has, what can i do whit it? How can I use it?
Thanks
All computers have a clock in the sense that they're just complex synchronous circuits. The Arduino has a 16MHz clock.
If you mean a real-time clock, that's a different question. It does not have one but that's because the Arduino is a development tool. If you want to add a real-time clock, that's up to the developer. A DS1337 real-time clock chip is a good choice IMO.