Hello there,
I just wanted to mention that a little extra caution is needed when using the Chinese Nano with a wall wart.
As most here know, the Arduinos can be run from a wall wart if the power is applied to the Vin terminal of the board. That typically takes a 9vdc wall wart and powers the Arduino. Once programmed, that makes it a stand alone application without the need for a USB port.
This post is about the Nano but i am not sure if any other boards apply too.
The main thing is that the Nano original specification was that it would contain a 5v linear regulator chip that takes up to around 30vdc input. That chip would regulate the unregulated wall wart down to 5v to run the Nano properly. If the current draw was not too high (loaded pins or other loads on the 5v supply) the wall wart could be as high as 20v without a problem.
What i found out was at least some of the Chinese Nano's use a 5v regulator that is only specified for a max of 15v input. 16v is too high. This means that an unregulated 12vdc wall wart would probably blow out the regulator chip and possibly damage other parts on the board. That's because a 12vdc wall wart can put out 16v or more because of the rectified peaks. A *regulated* wall wart however does work ok, as tested today. 12vdc regulated wall warts would be max 12.5v so any should work, although you may want to test the voltage first.
So the bottom line is be careful what wall wart you use with the Chinese Nano's if it is over 9vdc.
What else i dont know is if a lot of the Nano's are coming like this now. It may be more widespread than i know of at this time. So check the actual installed regulator part number on your Arudino board to make sure before you power it up for the first time with a wall wart. The part number for the ones i have is ASM1117-5.0 and that only takes a 15v max input voltage. There may be other part numbers being used too. The original regulator was a higher rated part like the 78M05 which took up to 35v input without blowing out, which could easily handle an unregulated 12vdc wall wart.
Good luck with it
I just wanted to mention that a little extra caution is needed when using the Chinese Nano with a wall wart.
As most here know, the Arduinos can be run from a wall wart if the power is applied to the Vin terminal of the board. That typically takes a 9vdc wall wart and powers the Arduino. Once programmed, that makes it a stand alone application without the need for a USB port.
This post is about the Nano but i am not sure if any other boards apply too.
The main thing is that the Nano original specification was that it would contain a 5v linear regulator chip that takes up to around 30vdc input. That chip would regulate the unregulated wall wart down to 5v to run the Nano properly. If the current draw was not too high (loaded pins or other loads on the 5v supply) the wall wart could be as high as 20v without a problem.
What i found out was at least some of the Chinese Nano's use a 5v regulator that is only specified for a max of 15v input. 16v is too high. This means that an unregulated 12vdc wall wart would probably blow out the regulator chip and possibly damage other parts on the board. That's because a 12vdc wall wart can put out 16v or more because of the rectified peaks. A *regulated* wall wart however does work ok, as tested today. 12vdc regulated wall warts would be max 12.5v so any should work, although you may want to test the voltage first.
So the bottom line is be careful what wall wart you use with the Chinese Nano's if it is over 9vdc.
What else i dont know is if a lot of the Nano's are coming like this now. It may be more widespread than i know of at this time. So check the actual installed regulator part number on your Arudino board to make sure before you power it up for the first time with a wall wart. The part number for the ones i have is ASM1117-5.0 and that only takes a 15v max input voltage. There may be other part numbers being used too. The original regulator was a higher rated part like the 78M05 which took up to 35v input without blowing out, which could easily handle an unregulated 12vdc wall wart.
Good luck with it