Submitted by patrik on Mon, 2011-03-07 10:00

Wired node #2. Mounted inside, measures values, collects data, displays data.

-Atmega 168.
-MAX485 RS485 transceiver.
-433 MHz rf receiver.
-MPXA4115A air pressure sensor.

MCP9701A temperature sensor
A simple temperature sensor from Microchip. Gives out 19.5mV/degree celsius, at 0C the output is 400mV. Connected to a analog input on the Atmega.
For accuracy it has to be calibrated. I used a small can filled with snow/ice that had just melted. The output of the MCP9701 was then measures, in this case it gave xx volt.