Low cost long range FSO telemetry links and 115Kbit serial video transmission.

[backspace <stephanusr@xxxxxxxxx>]

=== Low cost 1.4km IR link ===
From:  http://bit.ly/IKgwy.
Create a low cost long range FSO link for telemetry purposes and
combine it with the more expensive 10Meg http://en.wikipedia.org/wiki/RONJA
system. Use a low cost TSOP1838 [[InfraRedLeds]](http://bit.ly/12n2MH)
from the the linux http://www.lirc.org design for the receiving Rx
side. Use a Jewelers Loupes 13cm lens for Rx and Tx as per Ronja 10Meg
[[FreeSpaceOptics]](http://bit.ly/oQOOO) to extend the lirc.org design
to 1.4km. For Tx use the HPWT-BD00 Lumiled as per [[RonjaChips]]
(http://bit.ly/2hKngp), [[TransimpedenceAmp]](http://bit.ly/10Mi8h)
and  http://luxeonstar.blogspot.com. For closer 100m distances use
smaller plastic magnification lenses as per Kemo Kit nr.b213 #24-194
(http://www.kemo-electronic.com/). This allows an extremely low cost ,
slow bitrate(115Kbit) long distance links for use on farms for example
to switch valves and pumps, eliminating [[RadioModems]] for p-t-p
links. Use clusters of [[RadioModems]](http://bit.ly/kTvCZ) around
either a low cost FSO 115Kbit or higher throughput 10Meg Ronja
[[FreeSpaceOptics]](http://bit.ly/oQOOO) node and backhaul the RF
signals to the base,depending on bandwidth requirements. The short
range RF telemetry links sends out a signal on a PIR , IR beam
trigger, indicating an intrusion.

=== Slow bit rate video transmission ===
Implement full motion video at 115Kbit with [[SerialCameras]](http://
bit.ly/12uGmP) over a 115Kbit FSO link.  Vishay embedded IC does
115kbit. These low cost 115Kbit FSO links in turn interface with the
more expensive Ronja 10Meg [[FreeSpaceOptics]](http://bit.ly/oQOOO).
The [[SerialCameras]](http://bit.ly/12uGmP) modules have inbuilt
motion detection functionality. Combine these serial cameras with the
low cost IR link and populate all over a large premise for
surveillance purposes. The [[SerialCameras]](http://bit.ly/12uGmP) are
CMOS based and 0.01Lux sensitive. Only CCD at present allows for
0.003lux. Note that there is no such thing as 0lux or
0.00000000....00lux , the CCTV sites claiming 0lux with
[[InfraRedLeds]] on are incorrect.

=== IRDA specification ===
The [[IrDa]] protocol has to deal with LED flashover due to the very
tight spacing between two adjacent leds used for Rx and Tx in a small
embedded device. Flashover is solved by separating the the Tx and Rx
parts with a pipe container.