VB 2010 & Arduino Uno - Serial Communication

Projects Interfacing w/ Software on the Computer
18

Hello HugoPT,

By accident, I open the serial monitor and type in ABC then hit SEND.
Your suggestion works.

The question is now how i send "ABC" in VB to Arduino.
Here are my steps:

  1. Open and run VB to send "ABC" to "COM4" (i.e. Open -> Write -.Close)
  2. Upload sketch. Wait till load is done. Open serial monitor. Monitor is blank.
  3. While the serial monitor is still on, I run VB again and receive a message saying that port "COM4" is busy.

Any idea ?