Application using librtlsdr to decode the temperature from a wireless temperature sensor (433.92MHz)
C CMake Shell Makefile Python C++ M4
Latest commit ff6738d Mar 22, 2017 @crushedice2000 crushedice2000 committed with Update util.c


rtl_433 turns your Realtek RTL2832 based DVB dongle into a 433.92MHz generic data receiver

How to add support for unsupported sensors

Read the Test Data section at the bottom.

Installation instructions:

Compiling rtl_433 requires rtl-sdr to be installed.

Depending on your system, you may also need to install the following libraries:

sudo apt-get install libtool libusb-1.0.0-dev librtlsdr-dev rtl-sdr

Installation using cmake:

cd rtl_433/
mkdir build
cd build
cmake ../
make install

Installation using autoconf:

cd rtl_433/
autoreconf --install
make install

The final 'make install' step should be run as a user with appropriate permissions - if in doubt, 'sudo' it.


rtl_433 -h
Usage:	= Tuner options =
	[-d <RTL-SDR USB device index>] (default: 0)
	[-g <gain>] (default: 0 for auto)
	[-f <frequency>] [-f...] Receive frequency(s) (default: 433920000 Hz)
	[-p <ppm_error] Correct rtl-sdr tuner frequency offset error (default: 0)
	[-s <sample rate>] Set sample rate (default: 250000 Hz)
	[-S] Force sync output (default: async)
	= Demodulator options =
	[-R <device>] Enable only the specified device decoding protocol (can be used multiple times)
	[-G] Enable all device protocols, included those disabled by default
	[-l <level>] Change detection level used to determine pulses [0-16384] (0 = auto) (default: 0)
	[-z <value>] Override short value in data decoder
	[-x <value>] Override long value in data decoder
	[-n <value>] Specify number of samples to take (each sample is 2 bytes: 1 each of I & Q)
	= Analyze/Debug options =
	[-a] Analyze mode. Print a textual description of the signal. Disables decoding
	[-A] Pulse Analyzer. Enable pulse analyzis and decode attempt
	[-I] Include only: 0 = all (default), 1 = unknown devices, 2 = known devices
	[-D] Print debug info on event (repeat for more info)
	[-q] Quiet mode, suppress non-data messages
	[-W] Overwrite mode, disable checks to prevent files from being overwritten
	= File I/O options =
	[-t] Test signal auto save. Use it together with analyze mode (-a -t). Creates one file per signal
		 Note: Saves raw I/Q samples (uint8 pcm, 2 channel). Preferred mode for generating test files
	[-r <filename>] Read data from input file instead of a receiver
	[-m <mode>] Data file mode for input / output file (default: 0)
		 0 = Raw I/Q samples (uint8, 2 channel)
		 1 = AM demodulated samples (int16 pcm, 1 channel)
		 2 = FM demodulated samples (int16) (experimental)
		 3 = Raw I/Q samples (cf32, 2 channel)
		 Note: If output file is specified, input will always be I/Q
	[-F] kv|json|csv Produce decoded output in given format. Not yet supported by all drivers.
	[-C] native|si|customary Convert units in decoded output.
	[-T] specify number of seconds to run
	[-U] Print timestamps in UTC (this may also be accomplished by invocation with TZ environment variable set).
	[<filename>] Save data stream to output file (a '-' dumps samples to stdout)

Supported device protocols:
    [01]* Silvercrest Remote Control
    [02]  Rubicson Temperature Sensor
    [03]  Prologue Temperature Sensor
    [04]  Waveman Switch Transmitter
    [05]* Steffen Switch Transmitter
    [06]* ELV EM 1000
    [07]* ELV WS 2000
    [08]  LaCrosse TX Temperature / Humidity Sensor
    [09]* Template decoder
    [10]* Acurite 896 Rain Gauge
    [11]  Acurite 609TXC Temperature and Humidity Sensor
    [12]  Oregon Scientific Weather Sensor
    [13]  Mebus 433
    [14]* Intertechno 433
    [15]  KlikAanKlikUit Wireless Switch
    [16]  AlectoV1 Weather Sensor (Alecto WS3500 WS4500 Ventus W155/W044 Oregon)
    [17]* Cardin S466-TX2
    [18]  Fine Offset Electronics, WH2 Temperature/Humidity Sensor
    [19]  Nexus Temperature & Humidity Sensor
    [20]  Ambient Weather Temperature Sensor
    [21]  Calibeur RF-104 Sensor
    [22]* X10 RF
    [23]* DSC Security Contact
    [24]* Brennenstuhl RCS 2044
    [25]* GT-WT-02 Sensor
    [26]  Danfoss CFR Thermostat
    [27]* Energy Count 3000 (868.3 MHz)
    [28]* Valeo Car Key
    [29]  Chuango Security Technology
    [30]  Generic Remote SC226x EV1527
    [31]  TFA-Twin-Plus-30.3049 and Ea2 BL999
    [32]  Fine Offset WH1080 Weather Station
    [33]  WT450
    [34]  LaCrosse WS-2310 Weather Station
    [35]  Esperanza EWS
    [36]* Efergy e2 classic
    [37]* Inovalley kw9015b rain and Temperature weather station
    [38]  Generic temperature sensor 1
    [39]* Acurite 592TXR Temp/Humidity, 5n1 Weather Station, 6045 Lightning
    [40]* Acurite 986 Refrigerator / Freezer Thermometer
    [41]  HIDEKI TS04 Temperature, Humidity, Wind and Rain Sensor
    [42]  Watchman Sonic / Apollo Ultrasonic / Beckett Rocket oil tank monitor
    [43]  CurrentCost Current Sensor
    [44]  emonTx OpenEnergyMonitor
    [45]  HT680 Remote control
    [46]  S3318P Temperature & Humidity Sensor
    [47]  Akhan 100F14 remote keyless entry
    [48]  Quhwa
    [49]  OSv1 Temperature Sensor
    [50]  Proove
    [51]  Bresser Thermo-/Hygro-Sensor 3CH
    [52]  Springfield Temperature and Soil Moisture
    [53]  Oregon Scientific SL109H Remote Thermal Hygro Sensor
    [54]  Acurite 606TX Temperature Sensor
    [55]  TFA pool temperature sensor
    [56]  Kedsum Temperature & Humidity Sensor
    [57]  blyss DC5-UK-WH (433.92 MHz)
    [58]  Steelmate TPMS
    [59]  Schraeder TPMS
    [60]* LightwaveRF
    [61]  Elro DB286A Doorbell
    [62]  Efergy Optical
    [63]  Honda Car Key
    [64]* Template decoder
    [65]  Fine Offset Electronics, XC0400
    [66]  Radiohead ASK
    [67]  Kerui PIR Sensor
    [68]  Fine Offset WH1050 Weather Station
    [69]  Honeywell Door/Window Sensor
    [70]  Maverick ET-732/733 BBQ Sensor
    [71]* RF-tech
    [72]  LaCrosse TX141TH-Bv2 sensor
    [73]  Acurite 00275rm,00276rm Temp/Humidity with optional probe
    [74]  LaCrosse TX35DTH-IT Temperature sensor
    [75]  LaCrosse TX29IT Temperature sensor
    [76]  Fine Offset Electronics, WH25 Temperature/Humidity/Pressure Sensor
    [77]  Fine Offset Electronics, WH0530 Temperature/Rain Sensor

* Disabled by default, use -R n or -G


Command Description
rtl_433 -G Default receive mode, attempt to decode all known devices
rtl_433 -p NN -R 1 -R 9 -R 36 -R 40 Typical usage: Enable device decoders for desired devices. Correct rtl-sdr tuning error (ppm offset).
rtl_433 -a Will run in analyze mode and you will get a text description of the received signal.
rtl_433 -A Enable pulse analyzer. Summarizes the timings of pulses, gaps, and periods. Can be used in either the normal decode mode, or analyze mode.
rtl_433 -a -t Will run in analyze mode and save a test file per detected signal ( Format is uint8, 2 channels.
rtl_433 -r file_name Play back a saved data file.
rtl_433 file_name Will save everything received from the rtl-sdr during the session into a single file. The saves file may become quite large depending on how long rtl_433 is left running. Note: saving signals into individual files wint rtl_433 -a -t is preferred.
rtl_433 -F json -U | mosquitto_pub -t home/rtl_433 -l Will pipe the output to network as JSON formatted MQTT messages. A test MQTT client can be found in tests/

This software is mostly useable for developers right now.

Supporting Additional Devices and Test Data

Note: Not all device protocol decoders are enabled by default. When testing to see if your device is decoded by rtl_433, use -G to enable all device protocols.

The first step in decoding new devices is to record the signals using -a -t. The signals will be stored individually in files named that can be played back with rtl_433 -r

These files are vital for understanding the signal format as well as the message data. Use both analyzers -a and -A to look at the recorded signal and determine the pulse characteristics, e.g. rtl_433 -r -a -A.

Make sure you have recorded a proper set of test signals representing different conditions together with any and all information about the values that the signal should represent. For example, make a note of what temperature and/or humidity is the signal encoding. Ideally, capture a range of data values, such a different temperatures, to make it easy to spot what part of the message is changing.

Add the data files, a text file describing the captured signals, pictures of the device and/or a link the manufacturer's page (ideally with specifications) to the rtl_433_tests github repository. Follow the existing structure as best as possible and send a pull request.

Please don't open a new github issue for device support or request decoding help from others until you've added test signals and the description to the repository.

The rtl_433_test repository is also used to help test that changes to rtl_433 haven't caused any regressions.

Google Group

Join the Google group, rtl_433, for more information about rtl_433:!forum/rtl_433


If you see this error:

Kernel driver is active, or device is claimed by second instance of librtlsdr.
In the first case, please either detach or blacklist the kernel module
(dvb_usb_rtl28xxu), or enable automatic detaching at compile time.


sudo rmmod dvb_usb_rtl28xxu rtl2832