hello everyone, i had an arduino nano that i wanted to use for a special task. After soldering this nano to the copper plate, there was no problem when I gave 12 volts to check if it was working. However, after turning off the power and then powering it back up, smoke started coming out of the nano. What could be the reason for this?
A dragon lives under the copper?
Need a bit more info: pics, schematic etc
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Solder bridge Vcc to ???. Consider that one practice. Buy another.
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this is the schematic of the system I wanted to design but none of the components were connected to the nano at the time of the incident
What was connected and how. Do you have a photo
Not unless you complete the connections with wires. What you have there is basically an interconnection list.
Take a step back and imagine that you have been asked the same question, but you know nothing about the project. Would you have enough information to analyze it?
That's the problem: nothing was connected but VIN and GND. It was just arduino.
that's what I'm trying to tell you. No wires were connected. Only nano and supply pins
You haven't provided nearly enough information.
I refuse to speculate about what you have there.
Either you had a dud nano, things are not as you say, or the dragon!
Hi, @kadir_sever
Welcome to the forum.
Can you please post images of your project, showing how you soldered the Nano to the "copper plate"?
Do you mean PCB?
As @anon57585045 has suggested, a proper schematic instead of a diagram suitable for PCB design would be helpful.
Thanks.. Tom... 
Wireless power?
Did you have 12volt power and USB connected.
Leo..
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