Over on his blog, Gough Lui has posted about his experiences with decoding various ASK/OOK devices on the unlicenced 433 MHz ISM band using an RTL-SDR and the command line program rtl_433.

Gough shows how he was able to receive and decode the data from an Aldi weather station device and a wireless doorbell transmitter. He also was able to modify the rtl_433 code slightly to produce a CSV log file of the temperatures that were received and decoded from the weather station.