January 3, 2015

Reading external temperature sensor with rtl_433 on Fedora 21

There are lots of afordable temperature sensors that have outdoor sensor that transits temperature to indoor unit. You can capture this transmission and decode it with rtl_433 package and cheap DVB-T songle.

rtl_433 is package that turns your Realtek RTL2832 based DVB dongle into a 433.92MHz generic data receiver.

To install rtl_433 on Fedora 21 just follow these simple steps:

sudo dnf install cmake libusb-devel rtl-sdr-devel  
git clone https://github.com/merbanan/rtl_433.git
cd rtl_433/
mkdir build
cd build
cmake ../
cd src

If you get error message then it is likely that you have module confilict. Just remove or blacklist these modules: dvb_usb_rtl28xxu, rtl2832, rtl2830, dvb_usb_v2 and dvb_core:

sudo rmmod dvb_usb_rtl28xxu rtl2832 rtl2830 dvb_usb_v2 dvb_core