New ESP32-WROVER Ethernet Board

mikemoy
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Re: New ESP32-WROVER Ethernet Board

Postby mikemoy » Wed May 16, 2018 12:22 pm

I started on that design last week ;)
I found a few Rj45's that have the magnetics and access to the power pins.
https://www.digikey.com/product-detail/ ... ND/5800452

I also added this POE module to the design. It can be added on top of the module for those who want POE.
http://www.silvertel.com/poe-modules/379-ag9900.html

Just working hard to keep it the same size ;)

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Vader_Mester
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Re: New ESP32-WROVER Ethernet Board

Postby Vader_Mester » Thu May 17, 2018 7:55 am

The price of that RJ45 is pretty hefty :shock: But compactness is costly so I'm not surprised.

The PoE module is a good idea, however I found that not many people use the 48V system, because of the cost of converter modules. Instead I found that people use 12V or 24V, (most cameras use 12V and not even isolated DC-DC :D ) which is much cheaper to get the DCDC modules to convert it down to 5V or 3.3V, and also you can buy 12V ans 24V adapters anywhere. 48V? Not really. The whole signiture thing is... I think the actual standard is only used in industial situation, most makes don't buy that expensive stuff. Technically you can put any voltage on the PoE pairs.

Disadvantage is of course the voltage drop, which increases by cable length and current, but using more than 1A is a rare occasion, and under that, the drop is within the limits even for a longer cable, say 20m.

So adding an actual PoE module, is a plus, but just anoying additional cost. But this is just my opinion.
There are 2 types of programmer people: The Expert programmer and The Smart programmer

The Expert programmer easily writes any code from scratch.
The Smart programmer uses his google/github powers first ;)

mikemoy
Posts: 63
Joined: Fri Jan 12, 2018 9:10 pm

Re: New ESP32-WROVER Ethernet Board

Postby mikemoy » Thu May 17, 2018 11:12 am

I agree that the cost of the RJ45 is high. However it has a few features that I like in it over others I have looked at. such as filtering on the POE lines, and I want to keep the size down, so having the transformer built in is a plus as well.
As for the POE module. I am still keeping the original onboard power supply. The POE module output was going to feed the onboard power supply's input anyways & I was going to route the POE modules output pin to a pin on the header so the user could use that to power whatever they liked with it. It's up to the buyer to choose if they want the to add the POE modules or not. If not, but they want to take the chance of dirty power power over the POE lines they could just jumper the POE module input to the output to bypass it.

My day job is building industrial equipment. So it's in my blood to design things right, and not to minimize cost. It's been a struggle for me to make this as low cost as possible because there are so many pit falls out there that a use can do to make it fail, that I implement to help it overcome.

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Vader_Mester
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Re: New ESP32-WROVER Ethernet Board

Postby Vader_Mester » Sat May 19, 2018 8:45 am

That's cool! Looking forward to it!
There are 2 types of programmer people: The Expert programmer and The Smart programmer

The Expert programmer easily writes any code from scratch.
The Smart programmer uses his google/github powers first ;)

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