My yearly post about environmental monitoring devices

Sorry Alex, but I think you are barking up
the wrong tree.

When you add Ethernet as a requirement
then you are asking for an I/O interface
that is more complex

Ethernet is cheap and trivial, drop some
code in one of these (cpu is built into the
rj45 socket)

talk ibutton on the serial port and you're done.

and more expensive
than the basic temp/hum recorder on the PIC.

Ethernet or don't bother. Serial is so last century.


Cheap is relative. These are showing about $50 each, Considering your
average MCU is under $10, and smaller ones under $5, this can be equal to
or more than the rest of your device.