I have searched on the web quite a lot to find a Lost Model Alarm that
incorporates all features one could need in case the "landing" occurred
somewhere around, in the corn field or down the mountain.
I landed in your website. That was really good luck.
I discovered then that the right name for this wonderful piece of
jewelery was LoMA!
So first of all thank you very much for sharing it with other
r/c modelers around the globe and for providing such a good technical support.
As it is right now, your LoMA has everything I was looking for.
Really great job. The power save feature is just brilliant.
I have verified that my radio X-3810 (retrofitted with JETI Duplex 2.4GHz Tx module
and JETI Duplex 2.4GHz R8 receiver) is capable of generating pulses long enough
to activate the LoMA when in Fail Safe and it should be fine:
ATV +150% ==> 2.09ms (max)
ATV -150% ==> 0.9ms (min)
So I am ready to build 6 of the to equip all my models with it.
I would have only one small wish, to add a backup LiPo battery
(see attached schematics) with a schottky diode.
This because I noticed that in all crashes or very hard landings
the big LiPo battery pack flies away and disconnect itself from the ESC.
If the LoMA is connected to a spare channel of the receiver,
after the crash it would remain unpowered.
The idea to add a tiny LiPo battery to solve this potential problem.
LiPo fully charged 4.2V, empty 3.6V
The schottky diode has 0.4V fwd voltage
This would mean that the LoMA will have +5V (BEC) in normal conditions
and between 3.8V and 3.2V in case of a crash or a hard landing.
I have searched in your forum and I did not found similar requests
or questions. If there was one then I apologize.
Do you think that the attached schematics could work?
Is there a better way of adding a backup battery?
I have foreseen a switch, to turn the LoMA off when not in flight
(hangar or charging), and a connector to charge the LiPO battery.
RC-CAM, thank you once again for sharing your projects with the rest of the world!
Thank you in advance and ciao. Roberto