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Hi i am new to Arduino and I want to know if it is possible to read the data from a sensor that it is connected to the Arduino, I am using the Arduino mega 2560, which is already working, as I have a LED which change color depending on the detection of the object and then store it in a file as txt or another normal extension.

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    You need to edit this question to be more specific about what you are asking. A typical Arduino can report data back to a USB host such as a PC (typically actually through a serial port like channel, although the transport is USB), however at least the ATmega-based ones are unable to act as hosts themselves, which means that they cannot directly write data to a USB device such as a flash drive. – Chris Stratton Jul 3 '17 at 12:48
  • That's correct. I use Arduinos of many flavors to write data out their serial port, and have a Python program on the PC side waiting for data on /dev/ttyUSB0 (for example). That works fine. Please take the tour at arduino.stackexchange.com/Tour then come back and edit this question to be more specifically about the Arduino. You are welcome here. But this question is in danger of being closed as-is. – SDsolar Jul 4 '17 at 2:44
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I don't have experience with Processing, but probably that is what you need. It communicates through USB and with the CreateWriter function, you can create a text file.

More about Processing can be found at Processing

Also another thread at Electronics stack exchange might help:

Related question

Alternatives (also mentioned in the above thread):

  • Use serial port directly with a terminal application on the PC
  • Use an SD card inside the Arduino to log
  • Thanks I would want to do that with the serial port directly with a terminal application as putty or the Arduino serial monitor. – Miguel Sanz Narrillos Jul 3 '17 at 10:48
  • Than just copy the content to a text file. – Michel Keijzers Jul 3 '17 at 12:15
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From what I understand from your question, you want to store the data displayed in the Serial monitor to a text file or something similar. As the Arduino itself cannot do this task, I used "GoBetwino" to save my data from an Arduino into a text file, from where you can export the data into Excel if you want charts and graphs. The process is fairly easy and described properly in their user manual. https://playground.arduino.cc/Interfacing/GoBetwino

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