Edited by 3Point14 at 2015-11-1 12:40

Plugged in my Arduino tonight. I was testing a UART cable. That was good. When I got the cable working. One of the first things I saw was a CPU at 72C. I unplugged the Arduino and evetything seems okay now. The Arduino is a compatible Uno, so it could be defective. I never noticed a problem on my Rpi, but I doubt I opened dmesg while I was using the Arduino.

Does someone else with an Arduino want to verify that their CPU doesn't overheat when an Arduino is connected?

From all I have read on the forum, 72 isn't overheated... but if it is only xx without, i see what you mean.

Give me a command to type in for temps and I will compare my mega clone on a Plus for you...does it matter what sketch is running?

Actually, my ramps/mega compatible board in my 3D printer has been connected and sending serial data continuously for 3 days now...

Tell me what to type and I'll get temps for you

I don't know how to get temps. I just saw a warning in dmesg that I'd never seen about the CPU temp. I'll mess with it some more and see if I see anything.

Try to use it

• cat /sys/devices/virtual/thermal/thermal_zone0/temp
  

That works. I didn't see the temp rise above 43 when I reconnected the arduino. Probably a false alarm. The first time, the Arduino was running a sketch that read RFID tags, but I wasn't scanning any tags and I didn't have the IDE up. I'll play some more and try to recreate the problem. Thanks for the help!