Since I have concluded that this is an MCU issue (MCU not sending response to computer), I have decided to put this thread here.

Hello, I recently set up my LED Marquee kit and went through the guide. I did all the code and transferred it to the MCU, but now, I am experiencing some problems. in the beginning of the serial-comm.py program, it sends "NO DATA " to the MCU. All mine does is send the N in NO DATA, so I am assuming that my MCU is not sending the "n" back to the computer. However, I checked all my code and it is all correct. I also checked the Python code and redownloaded it to be safe. Still, it did not work. I used the LED array template program that comes with the source code that you can download. I transferred that to the MCU, but that did the same thing: It only sent the first letter, and then gets stuck on "Waiting for request..." in the CMD. I tried typing things in and pressing enter, but it doesn't really do anything.

Any ideas on what could be causing this?

Thanks in advance,

Dalton

Hey there. I recently ran into a problem with my led array when it came to scrolling messages. Slightly different problem but maybe it will help. When starting serial-comm.py it would send 'NO DATA ' except instead of sending just the 'N', as in your case, it would send a garbled mess. After spending much time looking at some python documentation, on line 34 of serial-comm.py where it reads--

serial = serial.Serial(serial_comm_dev, serial_comm_rate)

I added 'timeout = 1' to the parameter list like this--

serial = serial.Serial(serial_comm_dev, serial_comm_rate, timeout = 1).

This cleared up all my issues and I can now scroll legible messages.

It has something to do with how many bytes the buffer can read at a time i think. I'm no expert at this and I'm not sure this is the correct or best way of doing it, but it worked for me and my problem. Give it a shot maybe it will also work for yours.