flashing LED - first project Answered
I'm eager to start my first project, but I don't know how to do it.
Its basically an LED blinking twice, once at every 20 min.
I can tackle it in Arduino since its code, but I need something really small, the smallest possible! (the way that would be powered also needs to take this into account. a 9v battery would be too much. but If it could have a way to be powered by USB that would be great).
The closest I can find, is something similar: A fake car alarm, that flashes a red led. But I need to have the 20min spacing!
Can I have some shared knowledge ? :)