I have Arduino nano clone, it was working good but now gets too hot to touch in second when connected to USB.
When powered externally then not heating.
Please note no fault of USB,
What was the project that you were working on when it went wrong? Do you still have anything connected?
Do you know what is overheating? 328P or serial-to-usb converter (on the bottom) or something else?
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Does that indicate that it works properly with external power. Did you put something on the 5V pin?
its works with external power, but i cant connect to usb so its of no use whether it works or not with external power, i cant upload program
its 328P heating
Is BAUD Rate 115200 heating ?
No.
Post an annotated schematic showing exactly how you have wired it. Be sure to include links to technical information on the hardware devices. Show all connections, power, ground and power sources. You apparently have something not connected correctly. I will take a SWAG and say if you disconnect everything form the board and just connect the USB it will be fine.
ok, will share schematics
What's the status
? ? ?
Heating too high in fraction of second even if i disconnect everything
If the bottom resistors of the 24V voltage divider have a bad connection, you have 24V on the input pins.
Although the current will be limited, it might have damaged the Nano.
My advice woukd be to buy a new Nano and replace those two voltage dividers by optocouplers.
Thanks, yes, dont have time to check this nano, i took other and started working on it, could you please take look at schematics ? let me know if any correction
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