Again, this works fine as long as the serial monitor from the ide is open. But the string still gets to the lcd. I had no idea the Arduino resets when the serial port opens. Again, harder than I thought. Any suggestions appreciated. I don't print anything to the serial monitor, it just has to be opened. I did not think that could work because I thought the Serial Monitor would have exclusive use of the serial port. But I am certainly no expert on Linux even though I use it every day.
Why not just use Python and save yourself a lot of trouble? Both will appear on the lcd. I still can't believe this is that hard. Python can work very much faster than the serial interface. I don't think you will experience any speed difference. Windows enforces the restriction that only one application at a time can access a COM port. Other operating systems do not. You are ASSuming that the default setting will work.
Clearly, they do not. Opening the Serial Monitor application sets all the serial port properties correctly, so that your application can then communicate with the Arduino.
Have any ideas? Possibly hardware flow control, either switch off with atty command or strap high in serial cable, search for null modem cable. X Tian 9, 2 2 gold badges 31 31 silver badges 47 47 bronze badges.
You have answered this 10 mins after I wrote my answer above and you haven't added any further information at all! Oh sorry, I did not read your answer completly. I saw that my answer is included in yours, so I will accept your answer as the correct one, as you described just what I have described. I don't know much about COM ports.
Could you please explain what does "the serial device on the other end is not blocking" mean? Some issue with the firewall? Zibri Zibri 4 4 silver badges 9 9 bronze badges. This works great and provided a wonderful solution to my UART dilemma of downloading a file over the UART and providing feedback path to see if it got there successfully. Thank you for posting! Truly appreciated! Leonardo Mendoza Leonardo Mendoza 1 1 silver badge 2 2 bronze badges. This is very good because it automates the process!
The only change I would make, which is totally optional, is to confirm the contents received is the same as sent - could be just a count or full on diff. To finish up, ctrl-c , then run fg then ctrl-c again.
The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. However, to write this data to the TextBox on a form, we need to create a delegate. NET does not allow cross-thread action, so we need to use a delegate.
The delegate is used to write to the UI thread from a non-UI thread. We can now receive data from a serial port device and display it on a form. Some devices will send data without being prompted. However, some devices need to be send certain commands, and it will reply with the data that the command calls for.
For these devices, you will write data to the serial port, and use the previous code to get the data that will be sent back. In my example, I will be communicating with a scale. This command is specific for this scale. You will need to read the documentation of your serial device to find commands that it will receive. To write to the serial port, I have created a "Start" button on the form. And that is all you need to do.
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