ESP32 Forum

I was checking the voltage outputs of my GPIO pins pins with my multimeter on my ESP32 DevKit v1, my positive probe was on a 5v pin and i accidentally touched the 3.3v pin with my negative probe. The smoke started to come out from both of the pins but i quickly removed the probes from the pins, there was a smell of burnt PCB but no signs of damage to the PCB and the board or the components and the board didn't even turn off when i shorted it. I checked all of the components and they seem to work fine, no overheating and the code is uploading without a problem, you can't sense the burnt smell unless you really put your nose against the board. I came to conclusion that the board survived the impact but i am not sure whether it is safe to use it or shall i get a new one. The thing i learned is that you have to be extremely careful when probing the electronics

Not sure how you define the word "safe". The bottom line is when something smokes it means something was pushed beyond its limits.
Do things survive that smoke a little? Sure. But IMHO, for what these cost just get a new one. Lets say because of this accident you weakened the 3.3v regulator, a filter cap, or an I/O pin. Seems to work just fine right now. But say a week from now you wire something else up to it and its just not working right. Odds are your going to think its a problem with your code when in reality its the weakened or bad part that is causing the problem.