wraggster
October 6th, 2013, 19:28
http://hackadaycom.files.wordpress.com/2013/10/img_20130710_203436.jpg?w=580&h=435 (http://hackadaycom.files.wordpress.com/2013/10/img_20130710_203436.jpg)
The Budapest hackerspace did some joint work with a local ham radio club and created anSSTV beacon (http://hsbp.org/rpi-sstv) housed inside a CCTV case that takes an image of its environment and transmits it using slow-scan television (https://en.wikipedia.org/wiki/Slow-scan_television) over ham bands.
As the title says, the build uses a Raspberry Pi to process the image taken from its camera and then transmits it over the air using a Ricofunk UHF transceiver with a main frequency of 433.425MHz. On the software side, PySSTV (https://pypi.python.org/pypi/PySSTV)is used to convert images to frequency/time tuples, UNIXSSTV then creates the actual audio file and finally sox (http://sox.sourceforge.net/) plays it. To avoid screwing up the Raspberry SD card, every part of the filsystem is either mounted in read-only mode (things like /home and /usr) or uses a ramdisk (things like /tmp and logs).
The plans, schematics and source code are available, so they hope that other hackerspaces will join the ranks!
http://hackaday.com/2013/10/06/sstv-beacon-based-on-a-raspberry-pi/
The Budapest hackerspace did some joint work with a local ham radio club and created anSSTV beacon (http://hsbp.org/rpi-sstv) housed inside a CCTV case that takes an image of its environment and transmits it using slow-scan television (https://en.wikipedia.org/wiki/Slow-scan_television) over ham bands.
As the title says, the build uses a Raspberry Pi to process the image taken from its camera and then transmits it over the air using a Ricofunk UHF transceiver with a main frequency of 433.425MHz. On the software side, PySSTV (https://pypi.python.org/pypi/PySSTV)is used to convert images to frequency/time tuples, UNIXSSTV then creates the actual audio file and finally sox (http://sox.sourceforge.net/) plays it. To avoid screwing up the Raspberry SD card, every part of the filsystem is either mounted in read-only mode (things like /home and /usr) or uses a ramdisk (things like /tmp and logs).
The plans, schematics and source code are available, so they hope that other hackerspaces will join the ranks!
http://hackaday.com/2013/10/06/sstv-beacon-based-on-a-raspberry-pi/