Hello, I have an old Dell laser color printer (1320c). As I need to print with google cloud print, now it's attached via USB to an old laptop used only as GCP server (Chrome + printer driver). Drivers sources are not available and there's not a compiled version for ARM, so no CUPS (there are threads...

Solved! Using power from USB hub.

Thank you very much!

F.

I meant; there are 6 relay commanding switches on a 24V DC.
Sprinkler valves are on 24V DC

F.

Can I power them from the USB hub I use also to power the raspeberry or should I use a totally external power supply?

F.

Thank you!

I'll let you know the results (next we)

F.

Relays are powered by raspberry gpio 2&4

Should I externally power them?

The relays are these:
http://elecfreaks.kancart.com/item_deta ... lay+Module

Standard connectors directly to gpio pins

F.

Hi to all, I have set up a sprinkler system for my garde governed by a Rpi with a webinterface. Mainly I have 6 24V relays ruled by Rpi GPIO that open and close the sprinkler valves. Raspberry PI is linked to home network through a wifi dongle. I have this problem: after a relay activation, randomly...