This is going to be easy, im new to all this but i think i have the answer just want to check.
I have a duemilanove a logging shield and a ethernet shield.
Im using the examples from the site (with updated libraries) for the mod's done to the shields.
Both shields work on there own but as soon as i plug them both onto the duemilanove only the ethernet shield works.
The SD-card examples error.
Using a multimeter i have found the voltage on the 5v drops from 4.7v to 4.6v when accessing the sdcard with the ethernet shield on.
Im powering the lot via at the moment via usb and using the serial monitor for diagnostics. I think the problem is not enough power.
My question is this, can i power the duemilanove via a 12v psu AND still use the usb to the computer or will this damage the duemilanove/pc?
Thanks in advance