I've been doing electronics for many years, but trying to troubleshoot a board
with a bunch of tiny tiny surface mount devices is probably more trouble than
I'd like to go through myself [for a $30 board].
Look, the price of this little board in Israel (where I live) is very expensive compared to the price in USA or other countries.
For me it's worth to fix it, and I appreciate the money even if it's 10$ board, I'll do anything to fix this.
This is my attitude to this and I see that yours is totally opposite.
If you don't want to help for 30$ board, I don't make you doing it...
Thank you anyway.
Power the arduino (just the arduino, remove everything else that might be plugged into it) by connecting an external source(7-12v) to the barrel jack. Does it turn on? If it does, what is the voltage at the 5v pin?
I tried doing it but unfortunately my computer doesn't recognize the Arduino...
make sure you have the right drivers installed. You may even try reinstalling the IDE software all-together. If that doesn't work, look into DFU mode for the USB chip. You might try simply resetting it before re-uploading the firmware.
I turn the board on by connectiong into Vin input 5V fron 7805 from another board.
I do have the right drivers, you ,misunderstood that it was working till I did the huge mistake of connecting 5V from 7805 to 5V output on the Arduino board.
Do you have any idea fixing it?
I love your idea of DFU mode, please guide me how to do it.
Did you install the driver for it on the computer to recognize the arduino?
Yes, I did. Everything went great untill I connect 5V from 7805 from another board to 5V input on the Arduino to turn it on.
Since that accident my computer can't recognize my Arduino.
Do you have the solution?