[chbot] Component links

[Volker Kuhlmann]

> And the SPI - ethernet module? :^)

The normal Ethernet shields for Arduino are something like this:
https://www.aliexpress.com/item/UNO-Shield-Ethernet-Shield-W5100-R3-UNO-Mega-2560-1280-328-UNR-R3-only-W5100-Development/1620285783.html

If you search for Ethernet, w5100, possibly combined with arduino or
uno, you'll get heaps. I've only ever seen 1 model and have not spotted
any variations either. Someone must have designed it and all the Chinese
have copied it as is.
Actually, searching Ethernet w5100 module works well.

E.g.
https://www.aliexpress.com/item/TOP-Mini-W5100-LAN-Ethernet-Shield-Network-Module-board-Best/32331772788.html

DO NOT BUY FROM
  The HS (Hong Kong) co., LTD
  https://www.aliexpress.com/store/1201455
They sent me a faulty board, deny it, and Aliexpress has no clue about 
electronics either and doesn't help.

There are W5200 and W5500 boards/modules around as well. Adafruit has
some software for it, but it's not supported by Arduino out of the box.
Those chips have some more capabilities but I did not find that relevant
for Arduino. E.g. the W5100 supports 4 simultaneous connections, but
ONLY ON DIFFERENT PORTS!! Whether this is a wiznet or Arduino limitation
I don't know, but that would have to be sorted before e.g. upping
connection limits.

The Arduino Ethernet code is convenient but pretty shocking, DHCP
blocks, no async option.

It's a very small and fast way to make something netwrok available. Hook
an Arduino Pro Mini up with one of these modules. The one annoying thing
is that these modules have no mounting holes. I haven't seen any with,
if you do, let me know.

HTH,

Volker

-- 
Volker Kuhlmann
http://volker.top.geek.nz/	Please do not CC list postings to me.