Just picked up a AU$20 indoor/outdoor wireless thermometer from Jaycar. It mentions on the back that it uses 433.9MHz so I connected an RTL-SDR and ran the omni decoding rtl_433 command line tool. Simply installed using apt on Ubuntu.
The remote FT-004-b temperature sensor sends a reading once every 60 seconds. There's a little LED that blinks just before it sends. Here's the setup.
rtl_433 can output decoded data in a variety of formats: kv|json|csv|mqtt|influx|syslog, so this could be handy for logging temperatures. rtl_433 can decode about 150 different devices and there is documentation on how to add more.
It supports the following modulation types:
OOK_MC_ZEROBIT : Manchester Code with fixed leading zero bit
OOK_PCM : Pulse Code Modulation (RZ or NRZ)
OOK_PPM : Pulse Position Modulation
OOK_PWM : Pulse Width Modulation
OOK_DMC : Differential Manchester Code
OOK_PIWM_RAW : Raw Pulse Interval and Width Modulation
OOK_PIWM_DC : Differential Pulse Interval and Width Modulation
OOK_MC_OSV1 : Manchester Code for OSv1 devices
FSK_PCM : FSK Pulse Code Modulation
FSK_PWM : FSK Pulse Width Modulation
FSK_MC_ZEROBIT : Manchester Code with fixed leading zero bit
Thanks to John, VK2ASU, for the nifty 433MHz SMA antenna.