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January 6, 2010
about 4 months ago
I see that the minimum input voltage is 4.35V. If you used something like a solar panel (or array) that may drop below that voltage would it be bad for the chip or would it just cutoff? I’m interested in coming up with a LiPo solar charging solution that allows for unattended operation (assuming sun during the days).
Is there a good chip already designed for this that anyone’s familiar with?
about 2 years ago
PickledDog is right about the feedback wire.
about 4 years ago
What I’m seeing says that the module only draws max 350mA. But regardless, 600mA @ 12V = 7.2 watts of power. The module runs at 3.3V, max 350mA = 1.2 watts. You can’t compare milliamps when the voltages are different. You have plenty of power with that adapter.
about 4 years ago
Received my set last week and I have to say it’s exactly what I needed, it’s perfect. BUT, you should know that (as has been mentioned), this is not really POE (in the classical sense). It’s probably more acurately Power-over-UTP, since PoE might lead people to believe that it’s compatible with PoE equipment. Basically it just breaks out unused pairs and lets you send your own power over them. This is exactly what I needed for a project that I had built last year that I want to place in my attic, but since it requires a power brick (and ethernet) I was thinking I was going to have to install an outlet up there. Now I can just put the AC adapter in the pantry (where my switch is) and I only have to run Cat 5 to the project. Perfect! It even uses the same jack as my project so it took me all of 15 seconds to test it out! Now I just have to get a bootloader installed on the AVRs that it uses so I don’t have to go into the attic for firmware updates. :-)
about 4 years ago
I should clarify my last post and say that you COULD do the same thing with this chip, but you’d have to implement the TCP/IP protocol on top of doing all the rest–the W5100 at least has that part done already. As has been mentioned before though, there are libraries available for this chip that do that (though it depends on the uC architecture you’re using) but again, that’s at least one more thing you have to handle in code. I find the W5100 to be very handy for Ethernet-to-microcontroller interfacing. In fairness, it’s a much newer (and more heavily integrated chip) than the ENC28J60. The primary advantage that the ENC28J60 gives you is direct access to the bits, at a lower level. Therefore, for some applications it’s superior. Oh, also the ENC is available in a DIP package.
You would need something at a higher level than this, this chip operates at layer 2 on the OSI model, you’re looking for something at layer 7 (HTTP). You need an embedded web server, or you can put a simple one together with a microcontroller, Wiznet W5100 and an HTTP server application. I’ve done this with an Atmel Mega88, but it was BARE BONES and VERY application specific. It took every bit of spare flash to store the strings necessary to generate the HTTP responses. Also, you’ll need to learn a lot about the HTTP protocol to write your own server.
I’m not an Arduino guy so I don’t know for sure but I think there are Arduino libraries available for driving the W5100 and providing HTTP server functionality (probably with an SD card). In any case, if you don’t want to shell out the bucks for an embedded server, you’ll have to combine several components (and do some programming) to build one.
News - The Automatic Cat Faucet
about 5 years ago
So I take it you’ve dedicated that sink to the cat? It doesn’t seem usable by people anymore…
about 6 years ago
The part in the Eagle Library seems to be for the DIP part, not the SMD part, unless I’m missing something.
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