problems with serial comms - arduino no longer works

Using Arduino IDE 1.x
1

I want to use arduino in a moving robot and want to use serial comms via bluetooth to transmit telemetry data between arduino uno and the arduino IDE.

I have two different serial comms:

  • COM 12 for communication via bluetooth
  • COM 13 to upload code to the arduino

The handling of serial seems to be quiet difficult and as a result several arduinos no longer work...

:frowning:

Details:

  • Arduino UNO
  • Arduino IDE 1.8.12

This is the tutorial I was following:
https://create.arduino.cc/projecthub/millerman4487/view-serial-monitor-over-bluetooth-fbb0e5

Details:

Step1

  • arduino connected via USB with PC / Port13 - Bluetooth NOT connected
  • upload of the code

Step2

  • arduino disconnected from PC
  • Bluetooth connected
  • Arduino powered on via battery
  • Bluetooth connection to PC pairing done
  • Arduino IDE switched to COM12
  • Arduino/Serial Plotter worked ok

Step3

  • power off
  • disconnected bluetooth module
  • connected arduino back to the PC via USB
  • Sorry - I forgot to switch Arduino back to COM13 at this stage
  • changed some code
  • upload failed (arduino IDE stuck - no error message
  • changed Serial to COM13
  • upload failed again... (arduino IDE stuck - no error message)
  • reboot of the PC -> no

Is the arduino really that fragile???

2

I checked again.

When I plug in the arduino at another PC - the board works again. I can esatblish serial connection.
It than also works with the first PC.

-> solved

3

Huh!

Well, can't give any more specific comments since you didn't post the error message. I would guess that it was something silly, though.

The official Uno's are fairly fragile - but not that fragile! (the clones are significantly more durable, as it happens)

4

thanks for first response.

I have 2 PCs with arduino IDE
I had three arduino uno with the problem above.

The current situations is as follows:

  • all three arduinos work fine with the 2nd PC
  • only one works fine with first PC
    working fine means: "I can upload programs"

There is no error message - the upload takes forever...

So there is still an issue with the serial connection on first PC.

What can I do here?