I find these tools useful for real-time interaction. In the past, I mentioned some Arduino serial monitor alternatives. The IDE comes with an SD Example called “ Datalogger.” Guess what it does. Newer or faster cards use a different protocol and won’t work. SD Cards use a form of the SPI protocol, so it is easy to interact with them from an Arduino. Alternatively, you can get an adapter to add SD Cards. Some Ethernet shields come with an SD Card reader. If you can add an SD card to your project, that is an obvious option to create an Arduino data logger. That will give you time to open the Serial Monitor. To solve this issue, either disable auto-reset, add a 3-4 second delay at the start of setup(), wait for a character to be received, or wait for a button press. Then when you open the Serial Monitor, the data logger restarts. What happened is that after programming, the board starts logging. In that code you can see data logging started and then restarted. So if your log file shows “Initializing SD card…” with a few data lines in between, it is because there is a reset happening. With all of these examples, please remember that whenever you open the Arduino’s serial port, the board will reset. Important note on Arduino Data Logger examples Here are some ideas if you want to build an Arduino data logger with or without a PC. However, it does not have a built-in method for saving the data. The Arduino serial monitor is usable when you want to watch data from an Arduino.
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