The SDR hardware sold online usually includes an antenna. These antenna are not suitable to pickup radio transmissions that are low powered or distant. Here is an example of NOAA weather radio that is transmitted about 15 miles from my location. This first image is with the standard antenna shipped with the SDR adapter. The signal noise ratio is narrow, meaning the noise floor is high and the signal ceiling is low. The audio is noisy and hard to hear….
In this post I’ll be covering how to use SDR on Linux to capture data from wireless sensors using Benjamin Larrson’s RTL_433. I’ll start by covering the required install steps followed by some rudimentary examples. First you will need some kind of USB SDR hardware, this example we will be using the NooElec Nano. Here are the steps to install the RTL_433 software. Open a terminal window and enter in the following commands. sudo apt-get install libtool libusb-1.0.0-dev librtlsdr-dev rtl-sdr…
Working with thousands of image files captured from IP Cameras can be problematic. I’ve experienced issues with Caja hanging when simply browsing the folders that contain the captured images. To work around this, I compile video with FFMpeg from the image stock into a separate folder. First I’ll create a file list using this command ls /home/local/Videos/Security/IPCam3_20180726*.jpg > /home/local/Scripts/IPCam3_20180726.txt The results will then need to be processed so FFMpeg can use the file as a reference. Before – Not ready…