My arduino uno was fully fine when I bought it for the first time and uploaded code into it.I tested if my arduino could be run with 7v from Dc barrel jact from the XL6009E1 module with 1 lithium-ion battery. I tested that it could run for about 1 hour then the voltage dropped when load was connected but when I measured the voltage unloaded with a multimeter I got a reading of 16V. After a few days when I tried connecting my uno to my pc, it doesn't connect anymore. It connects to my pc & the Light blinks and turns on but my pc doesn't give a response like when a device is connected. Also it doesn't seem to be connected to my pc from both device manager and Arduino IDE. Is my "Mega 16u2 chip" dead?
16V is much higher than I would be comfortable connecting to an Arduino, but it shouldn't damage anything.
On the other hand, the fact that your Arduino isn't being recognised by the computer is not a good sign. Do you have an ISCP programmer to use when reloading the bootloader on the Arduino? If you connect that programmer to the six pin header near the USB jack, you can try reloading the firmware on the Mega 16u2 that does the USB-Serial conversion.
More than likely, given the operating Voltage range is 2.7V to 5.5V
is there any video tutorial on that?
also when connected to arduino, I tested the voltage which was only 6.88V . Only when the voltage was unloaded it was 16V
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