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Board_002: Add ethernet information

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Håkon Løvdal 2018-01-22 00:11:23 +01:00
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Electrical/Board_002/README.md
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@ -90,6 +90,19 @@ is the most natural and convinient choice and that if not then apparently
MCP2221 needs some additional electronics in order to [work properly as
an USB device](https://electronics.stackexchange.com/a/323551/568).
For ethernet the
[ENC28J60](http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en022889)
chip seems to be the
[go](https://www.reddit.com/r/arduino/comments/18pw59/diycheap_ethernet_shields/)
[to](https://www.open-electronics.org/low-cost-ethernet-shield-with-enc28j60/)
[solution](http://www.instructables.com/id/A-credit-card-sized-Ethernet-Arduino-compatable-co/)
[for](https://www.pocketmagic.net/atmega8-and-enc28j60-for-ethernet-support/)
[inexpensive](http://tuxgraphics.org/electronics/200606/article06061.shtml)<sup>2</sup>
DYI solutions. It only supports 10Mpbs, but that is more than
good engough for pushing out MQTT messages. It draws a significant
amount of current (~120mA or more) and gets gets hot so it might
need heatsinking, but that is an [inherent problem with all ethernet
controlles](https://electronics.stackexchange.com/questions/52349/why-is-ethernet-so-power-hungry).
-------------------
@ -97,3 +110,8 @@ an USB device](https://electronics.stackexchange.com/a/323551/568).
Distrelec](https://www.elfadistrelec.no/en/interface-ic-uart-usb-so-14-microchip-mcp2221-sl/p/11087556),
cheaper elsewhere.
<sup>2</sup> 20-30 NOK for the
[chip](https://www.elfadistrelec.no/search?q=ENC28J60&filter_Category1=&filter_Category1=&filter_Category1=&filter_Category1=&filter_Category1=),
from 30-40 NOK for the
[connector](https://www.elfadistrelec.no/search?q=magjack&filter_Category1=&filter_Category1=&filter_Category1=&filter_Category1=&filter_Category1=&sort=Price:asc&page=1).