I was offered a weather station for X-mas :
It measures indoor hygrometry and temperature and thanks to a wireless sensor it also measures outdoor temperature.
You can buy it from "Nature et Decouvertes". It is a special edition of a "La Crosse Technology" weather Station.
Reference at the back : WS-7014-IT
The station comes with a wireless sensor for outdoor temperature. It is powered by two AA 1.5V batteries, reference : TX29-IT
The TX29-IT sensor comes without LCD screen whereas the TX29D-IT has one :
The sensor and the station feature the "Instant Transmission Plus" technology from "La Crosse Technology" in the 868MHz band.
What the station misses is a serial port at its back so that we can read the information gathered from its internal sensors and from the wireless sensor(s). Indeed what's the point of measuring a physical entity then digitizing it, then wirelessly transmitting it, then displaying it on a LCD, if in the end you don't have a mean to store this digital information or to send it to a PC ?
The sensor is sold as spare parts for about 13-15 EUR. It would be perfect for my home automation project. I would just have to dispatch a bunch of such sensors in different areas of the house (and outdoor) and monitor them from a PC which would control the HVAC, the heating, etc.
Let's hack this WS and find a way to retrieve the information from a PC.
At first I wanted to use the station as a receiver and read the indoor temperature/hygrometry and the outdoor (wireless) temperature from any available signal, but after investigations I obtained something better.
The following plot has been obtained after 2 days of temperature monitoring :
The use of the soundcard to retrieve the receiver demodulated signal makes things easy but it is quite sub-optimal, the next steps would consist in :