Wifibroadcast - low budget analog-like HD transmission with OSD

Navio / Edge Project share
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Sorry mates, i was quite busy with family so i forgot to follow up. Actually i never had it running in the air, only on the ground, i was only flying for like 1h or so over the last 6 months. At that point i did not know, that i can not finish the detailed instruction in time. Sorry for that.

In the meantime i worked on buildroot support (which might be interesting if APM can be ported to buildroot as well, reduced boot time quite a bit):

Maybe someone can use it. Its still missing the autostart scripts, apart from that it works for buildroot.

Here’s a quick install instruction for more experienced people:

TX side (Navio Pi)

  1. sudo apt-get install mercurial libpcap-dev iw
  2. hg clone https://bitbucket.org/befi/wifibroadcast
  3. (optional if using AR9271 based dongles like TP-LINK TL-WN722N) sudo cp wifibroadcast/patches/AR9271/firmware/htc_9271.fw /lib/firmware
  4. cd wifibroadcast
  5. make

Then once everything is build you can manually run wifibroadcast like this:
sudo killall ifplugd #stop management of interface sudo ifconfig wlan0 down sudo iw dev wlan0 set monitor otherbss fcsfail sudo ifconfig wlan0 up sudo iwconfig wlan0 channel 13 raspivid -ih -t 0 -w 1280 -h 720 -fps 30 -b 4000000 -n -g 60 -pf high -o – | sudo ./tx -b 8 -r 4 -f 1024 wlan0
Replace channel number and raspivid parameters as you like.

Groundstation:
sudo apt-get install mercurial libpcap-dev iw hg clone https://bitbucket.org/befi/wifibroadcast cd wifibroadcast make

Overwrite original hello_video with modified one:
cd $HOME hg clone https://bitbucket.org/befi/hello_video cp hello_video/video.c /opt/vc/src/hello_pi/hello_video cd /opt/vc/src/hello_pi/ ./rebuild.sh

Manually run application:
cd $HOME/wifibroadcast sudo killall ifplugd #stop management of interface sudo ifconfig wlan0 down sudo iw dev wlan0 set monitor otherbss fcsfail sudo ifconfig wlan0 up sudo iwconfig wlan0 channel 13 sudo ./rx -b 8 -r 4 -f 1024 wlan0 | /opt/vc/src/hello_pi/hello_video/hello_video.bin

the TX and RX parameters -b, -r, -f must be the same!

Automatic starting:

TX;
cd #go into home directory hg clone https://bitbucket.org/befi/wifibroadcast_fpv_scripts cd wifibroadcast_fpv_scripts sudo cp init.d/wbctxd /etc/init.d sudo update-rc.d wbctxd start

RX:
cd #go into home directory hg clone https://bitbucket.org/befi/wifibroadcast_fpv_scripts cd wifibroadcast_fpv_scripts sudo cp init.d/wbcrxd /etc/init.d sudo update-rc.d wbcrxd start

Cam must be connected to TX raspi, else it will not work.

OSD is still experimental, as there is a bug in the OpnVG core library. Until that is fixed i do not recommend to use my OSD.

For those that just want to try wifibroadcast without Navio here is a simple image that has everything setup for you:

It has a simple configs textfile where you can modify everything from windows.

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