#define LED_BUILTIN 13. This indicates digital pin 13 on the Arduino's pins connector (also called a header). But at the same time LED_BUILTIN tells the Arduino to use the actual built-in LED on ...

If you buy something using links in our stories, we may earn a commission. Learn more. Last week I explained how to use a motion sensor to trigger an event with an Arduino. The event we triggered ...

I was thinking of using one in a variable PSU, got some of those cheap buck convertor modules, and another in an ESR meter. With pro-mini clones. Anyway, at least one of those might like a nifty menu.

If you use INO files you’re only adding one at a time, but if you use C/C++ header and source files it’s two at time. With the Arduino IDE all the files have to be in open windows in order to ...

To start, you need to buy an Arduino. It comes pre-assembled or, for those handy with a soldering iron, in kit form. A fully assembled Diecimila board from the excellent Make costs just $35.