I am wondering if a ruined my Nano but accidentally plugging it into my laptop USB (5V) into the Nano's USB connector, and also plugging 9V into the Vin pin of the Nano.

How much voltage can you connect to the Vin pin without damaging the Nano?

Sincere thanks,
TonyAm

 

A google search gave...
"The recommended voltage for powering an Arduino Nano through the VIN pin is 7V to 12V. While the board can technically operate on an external supply of 6 to 20 volts, using less than 7V may cause instability, and more than 12V may cause the voltage regulator to overheat"

There is more searchable details if you need it,

 

Thank you. Yeah, the tech info on this subject is all over the place. No one really knows... However, I can say that I believe anything over 12V on the Vin seems to be dangerous.

 

hi Tony,
I run all my Arduino modules with a 9V supply on the Vin pin, never had a problem.

If you use say, 12V the onboard regulator will run hot which I would advise against.
E

 

A great deal depends on the current supplied via the 5V on the Nano.
I've made many Arduino Nano based frequency generators to convert old crystal locked radio transceivers to tunable, and they use the 12V, (or 13.8V) from the car battery to the run. These all are ok, But if I was to have a large display that used a higher current back light for instance, an external regulator would be advisable.
For example, assuming a total of 20mA on the 5V rail, and a 12V supply, the regulator will dissipate (12V - 5V) x .02A = 7 x .02 = 0.14Watts.
But is you go to 150mA, then 7 x 0.15 = 1.05Watts. That would be way too hot!

 

Thank you. There was about 14V applied to the Vin pin, and my meter read 16V at one point. I guess that's enough to damage the Nano.

 

You may not have damaged the Nano, or you may have only damaged its voltage regulator. Have you tried loading and running the blink program? If it works when it's connected to the USB, The Nano survived. Then try running it from 9V. If it blinks, the regulator is still working.

 

I am wondering if a ruined my Nano but accidentally plugging it into my laptop USB (5V) into the Nano's USB connector, and also plugging 9V into the Vin pin of the Nano.

How much voltage can you connect to the Vin pin without damaging the Nano?

check schematics
https://www.arduino.cc/en/uploads/Main/Arduino_Nano-Rev3.2-SCH.pdf

D1 is used to avoid power conflicts so using both USB and Vin at the same time is not an issue.
another limitation is that absolute maximum voltage that LM1117-5.0 can tolerate is only 20V.
so the simplest solution when using Vin with higher voltage to add external regulator (preferably switching type when supply voltage is high)

 

You may not have damaged the Nano, or you may have only damaged its voltage regulator. Have you tried loading and running the blink program? If it works when it's connected to the USB, The Nano survived. Then try running it from 9V. If it blinks, the regulator is still working.

Thank you. I will try this. Appreciate the input from all.
TonyA