Silntknight
Moderator
What size is the barrel connector? I need inner diameter and outer diameter.
EDIT: I just noticed that there are two small pads near the power connector on this image: http://www.flickr.com/photos/48069758@N08/4613457315/in/photostream/
Can those be used to connect power to? It appears that the lower one is connected to a ground plane and the upper one is for +Vin. Can I simple solder to that?
gbulmer
Moderator
I believe those pads are connected the way you describe.
You could also use the LIPO socket, or even the USB socket, or VIN on the header.
I can't see my battery pack that I use, but I amm 99.9% sure it is a standard 2.5mm DC plug, I know that a 2.1mm DC plug works too (there is enough spring to mate with either plug).
Sparkfun have the part that matches the Eagle footprint, and it is 2.1mm
http://www.sparkfun.com/products/119
That has a link to an engineering drawing of the part, which has all of the dimensions.
gbulmer
Moderator
I already ordered one wrong produce, I'd rather not make that mistake again.
Is there no Radio Shack, or Fry's electronics, or something, nearby?
When I was looking, I figured out which plug I needed by going into Maplin (an overpriced UK electronics and gadget shop), and just plugged each plug on their display stand into an Arduino until I got three that fit.
I've done a similar thing in Radio Shack for laptop power chord; we needed one with a US mains power plug (it actually took most of the time to convert the English "Power Lead" into the term "Power Chord" which the sales assistant understood, and which confusingly is a term used by 70's UK rock bands).
Silntknight
Moderator
There is one, but driving there is a pain because I have to go through a lot of construction to get there.
I like the part about "power c(h)ords." I could see how that would get misinterpreted sometimes.
Really quickly, if I have a pin configured as an output, it is safe to have current drain into it? I have an optoisolator LED with the anode connected to +3.3V and the cathode connected to the pin. When the pin goes low, the LED turns on. This is my way of correcting for getting an inverting MOSFET gate driver when I needed an non-inverting one.
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