I have my project all completed and today hooked up a small 12v battery with the barrel connector, having read that 7v - 20v will operate the Uno through the barrel connector. It seems to have burned out the Uno. The UnoI built the project on has solder holes in front of the headers, which I used to connect a LoRa radio and temperature probes. Also has a paperwhite display shield which does not pass the pins through.
I cannot locate a seller of Unos with the solder holes. It would make things much simpler if I could use the same form factor. Any advice on who sells the Uno with solder holes (and headers) in the U.S.?
Wow! Thank you very much. That's exactly the board I need. It doesn't have UNO silk screened but otherwise looks like the board I used for my project.
Thanks again.
May I bother you further to explain the CH340? I'm new to Arduino. The board I am using looks just like the picture you sent except that UNO is not silkscreened on the board. Is CH340 something I need to purchase to work with the board you showed me?
Thank you in advance.
If you power the Arduino with 12V, you can't draw much current from the 5V pin. Overloading the 5V voltage regulator might be the cause of your problem.
I would advise to use a Nano and use a 5V supply, either directly or 12V plus buck converter.
Thank you. I had it working perfectly (paperwhite display, LoRa radio, two temperature probes) with 5v through the barrel connector. Was advised I'd have better stability with 12v through the barrel. Board stopped processing and USB won't connect once I did that. Returning to 5v, there are three red LEDs continually turned on. I appreciate you guidance. I should have continued with 5v through the barrel connector.
