Search found 9 matches

by Ohmware
Thu Jun 06, 2013 5:33 am
Forum: Eleven
Topic: How are the nice fonts on the Eleven Eagle layout done?
Replies: 3
Views: 2220

Re: How are the nice fonts on the Eleven Eagle layout done?

Aha, it looks like the ratio is the key! The default seems to be 8% now, and I like the look of the vector fonts at 15% much better. Thanks for pointing me in the right direction. (So far I'm just comparing the text of the name and value labels for components I've added to those I've preserved from ...
by Ohmware
Sat Jun 01, 2013 9:20 pm
Forum: Eleven
Topic: How are the nice fonts on the Eleven Eagle layout done?
Replies: 3
Views: 2220

How are the nice fonts on the Eleven Eagle layout done?

Hi all, I'm designing a shield for my Eleven, and to get an exact mechanical match I've taken the Eagle files and stripped all of the components and traces and created an Eleven Shield library component. I've kept the nicely done top and bottom silk markings, so that if I ever have my board professi...
by Ohmware
Thu May 16, 2013 2:11 pm
Forum: Eleven
Topic: [Solved] SPI Problems with Eleven
Replies: 5
Views: 6848

Re: SPI Problems with Eleven

Any news yet? I've had some success with using SPI from an Eleven but was puzzled to see consistent errors reported on my scope when using SPI decoding. I shrugged it off at the time (because my circuit was apparently working anyway), but it was on my "TODO someday" list to play around more to try a...
by Ohmware
Thu May 16, 2013 1:50 pm
Forum: Eleven
Topic: Need help! what should i use??
Replies: 3
Views: 2023

Re: Need help! what should i use??

So, first, this is a lot of questions to ask in a single post. You might want to break it up a bit, and I'd suggest some of the more basic questions might get more prompt responses at <http://electronics.stackexchange.com>. When you say you're attaching your LED "straight to" a 9V or 12V battery, do...
by Ohmware
Mon Feb 13, 2012 7:55 pm
Forum: ES: Ethernet Shield
Topic: Access to PoE power w/ 802.3af adaptor board?
Replies: 12
Views: 15861

Re: Access to PoE power w/ 802.3af adaptor board?

Ah, got it! I like how this style of layout leaves relatively little copper to be removed. Does it have any advantages or disadvantages as far as circuit characteristics? I have read that in multilayer designs it's best practice to avoid routing any signals in a ground plane. And I have also read th...
by Ohmware
Sun Feb 12, 2012 8:52 pm
Forum: ES: Ethernet Shield
Topic: Access to PoE power w/ 802.3af adaptor board?
Replies: 12
Views: 15861

Re: Access to PoE power w/ 802.3af adaptor board?

I have recently circled back 'round to this project, and so I downloaded both the schematic for the adaptor board and the Eagle software to look at it. I'm confused, though, because when I look at the board in Eagle it looks as though the GND pin isn't connected... Is there a ground plane that doesn...
by Ohmware
Wed Dec 14, 2011 9:56 pm
Forum: ES: Ethernet Shield
Topic: Access to PoE power w/ 802.3af adaptor board?
Replies: 12
Views: 15861

Re: Access to PoE power w/ 802.3af adaptor board?

So, could I theoretically put my own 12V regulator circuit in the prototyping area left on the shield after the PoE daughter board is installed? Tapping the power from the PoE power inputs directly? Or would this be ill-advised for some reason? (Like heat maybe…)
by Ohmware
Sat Dec 10, 2011 2:08 pm
Forum: ES: Ethernet Shield
Topic: Access to PoE power w/ 802.3af adaptor board?
Replies: 12
Views: 15861

Re: Access to PoE power w/ 802.3af adaptor board?

It was some time ago that I looked over the PoE specs, but IIRC part of what you can do with that complex signaling setup is negotiate how much power you want. Is that true? What exactly does the 802.3af module negotiate with the switch? Is there a schematic and BOM for the 802.3af module online som...
by Ohmware
Fri Dec 09, 2011 4:19 pm
Forum: ES: Ethernet Shield
Topic: Access to PoE power w/ 802.3af adaptor board?
Replies: 12
Views: 15861

Access to PoE power w/ 802.3af adaptor board?

Greetings,

I am using a Freetronics Ethernet Shield with the 802.3af adaptor board, and I need some higher-voltage DC supply for my project. Can I tap the two 802.3af pins on the shield directly to get this? Or should I use a step-up converter and draw the power from the 5v supply?