I think I remember reading something about people frying their uno r3 serial chips by using a separate power supply while having it plugged into USB.
I'm working on a project that requires the arduino uno r3 to be powered by a separate power supply AND have the usb cable connected to a PC for serial communication. When using a separate power supply, the board will reset sporadically and serial communication will fail after a few minutes. To isolate any cause I have disconnected all wiring from the arduino pins, and am just running a bare board. It still resets randomly and has serial communication failure when using the separate power supply. Any ideas where I can start troubleshooting this? The tx/rx lights still activate when it has failed, but my terminal receives nothing. Thought it might be a grounding issue but I measure 0V from USB ground to the barrel -.My search terms for this problem brought up nothing, but I think I remember reading something about people frying their uno r3 serial chips by using a separate power supply while having it plugged into USB.EDIT: Power supply is 12V 1.5A regulated. Reads 12.3V on a dmm. under arduino load, 12.27v. I will attempt using a different supply but suspect the problem will remain.
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16