Arduino connection problems

Projects Programming
1

Hi,

So I wrote an application that connects to +-10 arduinos. When I connect several arduinos to my pc in the office I never have any mayor connection problems. Sometimes I need to unplug and reinsert the usb cable into the computer when trying to connect to the arduino through its COM port.

But with the same application in another setting. Here some usb cables are up to 10-15 m long, and also the pc has 14 usb ports (6 in mb, 4 in front and 4 in a pci usb card)

My question is, does anyone know or have experience with problems that could be caused by these conditions?

As I said in my office I never have any weird connection problems. But on the other pc I have to restart the computer or sometimes even reupload the arduinos code to be able to connect to the arduino again.

Thanks for any help in advance

2

USB ports (and hubs) can't supply a large amount of power. It may be that having that many devices connected is drawing too much current. Are your Arduino boards powered up soley by the USB connection? Try powering them via the plug

3

Thanks that could be a logical solution, we will try to connect some arduinos to a plug and see if it helps! Thanks!