Hello forum, I want to gather sensor data with my Arduino UNO R3 over some period of time. During this interval I want to power my board with an external power source and not through the USB port of my laptop. After the data has been gathered I want to connect the board to my PC to transfer the data via USB. Unfortunately I noticed that when I start the python-script which I wrote for the communication between laptop and the Arduino, the board resets so that the previously gathered data is lost.
So I would like to ask if my approach is wrong, i.e. connecting a running board to the laptop, or if there might be something wrong with my programms. Perhaps it is important to mention that the external power source yields only 5 volts; though I have never experienced any problems with it before.
Maybe there is an entirely better method to transfer information from an Arduino to a PC to which it was formerly not connected.
If there is some information missing to solve the problem, please tell me what is missing and I will try to supply it.
Many thanks in advance for our help!