A Python wrapper for librtlsdr (a driver for Realtek RTL2832U based SDR's)
pyrtlsdr is a simple Python interface to devices supported by the RTL-SDR project, which turns certain USB DVB-T dongles employing the Realtek RTL2832U chipset into low-cost, general purpose software-defined radio receivers. It wraps many of the functions in the librtlsdr library (including asynchronous read support), and also provides a more Pythonic API.
pyrtlsdr can be installed by downloading the source files and running python setup.py install, or using pip and pip install pyrtlsdr.
All functions in librtlsdr are accessible via librtlsdr.py and a Pythonic interface is available in rtlsdr.py (recommended). Some documentation can be found in docstrings in the latter file.
Simple way to read and print some samples:
from rtlsdr import RtlSdr sdr = RtlSdr() # configure device sdr.sample_rate = 2.048e6 # Hz sdr.center_freq = 70e6 # Hz sdr.freq_correction = 60 # PPM sdr.gain = 'auto' print(sdr.read_samples(512))
Plotting the PSD with matplotlib:
from pylab import * from rtlsdr import * sdr = RtlSdr() # configure device sdr.sample_rate = 2.4e6 sdr.center_freq = 95e6 sdr.gain = 4 samples = sdr.read_samples(256*1024) # use matplotlib to estimate and plot the PSD psd(samples, NFFT=1024, Fs=sdr.sample_rate/1e6, Fc=sdr.center_freq/1e6) xlabel('Frequency (MHz)') ylabel('Relative power (dB)') show()
Resulting plot here.
See the files ‘demo_waterfall.py’ and ‘test.py’ for more examples.
Two new submodules are available for testing: rtlsdraio, which adds native Python 3 asynchronous support (asyncio module), and rtlsdrtcp which adds a TCP server/client for accessing a device over the network. See the respective modules in the rtlsdr folder for more details and feel free to test and report any bugs!
Note that the rtlsdraio module is automatically imported and adds stream() and stop() methods to the normal RtlSdr class. It also requires the new async/await syntax introduced in Python 3.5+.
The syntax is basically:
async def streaming(): sdr = RtlSdr() async for samples in sdr.stream(): # do something with samples # ... # to stop streaming: sdr.stop() # done sdr.close() asyncio.get_event_loop().run_until_complete(streaming())
The RtlSdrTcpServer class is meant to be connected physically to an SDR dongle and communicate with an instance of RtlSdrTcpClient. The client is intended to function as closely as possible to the base RtlSdr class (as if it had a physical dongle attatched to it).
Both of these classes have the same arguments as the base RtlSdr class with the addition of hostname and port:
server = RtlSdrTcpServer(hostname='192.168.1.100', port=12345) server.run_forever() # Will listen for clients until Ctrl-C is pressed
# On another machine (typically) client = RtlSdrTcpClient(hostname='192.168.1.100', port=12345) client.center_freq = 2e6 data = client.read_samples()
On platforms where the librtlsdr library cannot be installed/compiled, it is possible to import the RtlSdrTcpClient only by setting the environment variable "RTLSDR_CLIENT_MODE" to "true". If this is set, no other modules will be available.
Feature added in v0.2.4
matplotlib is also useful for plotting data. The librtlsdr binaries (rtlsdr.dll in Windows and librtlsdr.so in Linux) should be in the pyrtlsdr directory, or a system path. Note that these binaries may have additional dependencies.
There are a few remaining functions in librtlsdr that haven’t been wrapped yet. It’s a simple process if there’s an additional function you need to add support for, and please send a pull request if you’d like to share your changes.
All of the code contained here is licensed by the GNU General Public License v3.
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|File Name & Checksum SHA256 Checksum Help||Version||File Type||Upload Date|
|pyrtlsdr-0.2.4-py2.py3-none-any.whl (23.7 kB) Copy SHA256 Checksum SHA256||py2.py3||Wheel||Aug 18, 2016|
|pyrtlsdr-0.2.4.tar.gz (15.8 kB) Copy SHA256 Checksum SHA256||–||Source||Aug 18, 2016|