Graphing weather data

For the past few years I have been running a couple of weather stations. The data is logged in a MySQL database and the latest values are displayed on a website. Graphing was done by the proprietary software that came with the weather stations.

Recently some of the weather stations started to give me problems, resulting in my graphing being messed up. I decided to create my own graphs from the data in MySQL. Drawing graphs in real-time from MySQL is very intensive, so a better solution with caching is needed.

DVB-T2 in South Africa - a year later

It is a year since I started to have a look at the digital TV transmissions in Stellenbosch. Initially I used a PCTV Systems DVB-T2 290e to receive the transmissions on my computer under the Linux operating system.

Reggio di Calabria, Italy

Currently I am visiting Reggio di Calabria in the south of Italy for three months. It is for an exchange program the university here has with the University of Stellenbosch.

Some of the photo's I take will be uploaded to the following two web albums.

SDR with Raspberry Pi and DVB-T receivers

My holiday project is to play around with a Raspberry Pi and a RTL-2832U DVB-T USB receiver. This specific receiver has a mode where it dumps raw IQ samples over USB to the computer. The gnuradio experimenters realised this and therefore gnuradio supports this relatively cheap off the shelf USB receiver as a software defined radio.

The Raspberry Pi has a rather tiny ARMv6 CPU running at 800MHz. Doing signal processing on this CPU (as the GPU is still too closed to do it on that), looked impossible to me.


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