Community ~ Tips and tricks

This page will help you customize your ez wifibroadcast distribution to better suit your needs

Tuning the latency

One of the users have spend some time and effort on tuning his setup for low latency. You can read more about his setup and findings in this Issue.

Partition expansion

To expand your tiny filesystem to fit all your sd card type the following commands

rw
raspi-config
expand filesystem
reboot
after reboot & relogin
rw
resize2fs /dev/mmcblk0p2
reboot

Write to Read-Only File System

type "rw" at prompt to make system writeable
type "ro" at prompt to make it read only

Compiling kernel from source / making changes

Be sure your are on a raspberry pi 2 or 3 platform, otherwise the compilation time would be awfully long. During compilation the Pi can get hot, make sure cooling is adequate or reduce overclocking (force_turbo=0 and gpu_freq=300 in config.txt).

For Raspberry Pi2/3:

cd /usr/src/v7-kernel
make menuconfig
make -j4 zImage modules dtbs
make modules_install
./copy7.sh
reboot

For Raspberry Pi1/Zero/Odroid-W:

cd /usr/src/v6-kernel
make menuconfig
make -j4 zImage modules dtbs
make modules_install
./copy6.sh
reboot

Extending range and reception quality

Here are various setups that might help you extend the range and/or reception quality.

All TL-WN722N cards setup, one on the transmitter and three on the receiver Note: With Pi Zero as an AirPi, you are limited to one WiFi dongle.
The dual WiFi dongle on an AirPi is not much tested yet and there may be timing issues which can lead to badblocks. Therefore try at first single Wifi dongle and make sure that everything works as expected. You need at least about 120Mhz of "space" between the two different frequencies when using two WiFi dongles. For example one combination would be 1x CSL and 1x WN722N cards both connected to an AirPi (Note, Pi Zero is not supported for multiple Wifi dongle setup). Then GroundPi side with the CSL sticks set to something like 2484Mhz and the 722n sticks to something below around 2360Mhz.
Since WN722N has more power than CSL, use it for the transmitter portion and one WN722N + 2 CSL sticks for receiver portion. That should give you about 1km of stable range with stock antennas. Keep in mind though, the CSL sticks only work on 2412-2484, so you are limited to that frequency range when mixing Atheros and Ralink on the GroundPi.