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The stand-alone Lost Model Alarm

Old 07-15-2016, 08:47 PM
  #1  
solentlife
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Default The stand-alone Lost Model Alarm

Actually not quite stand-alone but one that can survive disconnection of main power source.

We all have them - lovely little gadgets we can stick in our models. Some go between Rx and servo waiting for no change of signal, others that are single lead and can be switched on / off through Rx.

But they suffer a serious flaw. They all depend on the main power still being connected.

My question is how to put together a small button cell to power one of the above so that when Rx power goes down - it still operates and beeps ? The switched one of course will not be suitable - but what about the one that listens for no change of Rx signal to servo ?

Could a second small back up power source be fed via the Rx to still give enough to switch the alarm on ? But it would need to be isolated while main power source is connected.

Simple answers ? I hope so ....

Anyone ?

Note : I have seen the new version on HK that is powered internally but all reviews show it to have a very weak barely audible alarm.

Nigel
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Old 07-15-2016, 09:24 PM
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dahawk
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I like the TILE idea. The small wafer that ties in to your smart phone using GPS
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Old 07-16-2016, 05:39 AM
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Originally Posted by dahawk View Post
I like the TILE idea. The small wafer that ties in to your smart phone using GPS
So do I but the price !

I'm thinking along the lines of the alarm plugged into balance lead and taking signal from Rx. If the alarm is tied to battery to avoid separation - loss of Rx signal might work.

Nigel
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Old 07-16-2016, 05:56 AM
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There's some knock-offs now that are much cheaper. eBay
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Old 07-16-2016, 01:24 PM
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Originally Posted by dahawk View Post
There's some knock-offs now that are much cheaper. eBay
Any links ? All I find are normal lost alarms.

Nigel
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Old 07-16-2016, 04:04 PM
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I'll look but you might Google

Nigel , Check on ebay There are some Chinese knock-offs to Tile like this one: http://www.ebay.com/itm/Nut-3-Gen-Ti...5HaIOUkDjcUeFw

USD $13.00

Cheers,

Hawk

Last edited by dahawk; 07-16-2016 at 11:45 PM.
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Old 07-19-2016, 05:43 PM
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Look at Hobbyking's Screamer, it has it's own battery, and functions in several ways, even ripped completely off the receiver.

I am going to get one very soon.
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Old 07-19-2016, 06:04 PM
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Originally Posted by Wildflyer View Post
Look at Hobbyking's Screamer, it has it's own battery, and functions in several ways, even ripped completely off the receiver.

I am going to get one very soon.
I did look but shied away after reading the reviews. Seems the beeper is too low in sound and hardly audible.

Of course WHEN AND IF Soloshot ever get their camera system sorted and sent to me - I will have the camera always pointing to the model to guide me to it. But that's a sledge hammer to crack a nut !

Pal of mine who is into Arduino / FPV / and all that - reckons that for $30 he can put together a 1S lipo powered alarm that will send to a pocket receiver etc.

I may just take him up on it.

nigel
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Old 07-19-2016, 07:41 PM
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I have seen people hold a megaphone to their ear, that greatly increases how well you can hear these things.
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Old 07-19-2016, 08:07 PM
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Ouch ! LOL
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Old 10-03-2016, 11:33 AM
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Pal of mine - we discussing my idea of stand alone Lost Model Alarm and problems of existing where main power gets ejected and then the LMA is dead.

He suggested this attached below.

Basically the LMA - one of the inline versions (idea will not work with the switched versions) where it sits between Rx and servo and detects lack of signal change.

You power the LMA by a single 1S LiPo and have the servo power bypass the LMA. If power is lost to Rx ... the LMA is still powered by the 1S LiPo and signal being lost - should trigger the LMA .........

I shall be testing this idea ... the question is whether the 1S is enough ... and whether the loss of Signal itself will trigger the LMA.

Nigel
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LMA idea.jpg (41.4 KB, 300 views)
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Old 10-03-2016, 02:32 PM
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1.

http://www.ebay.co.uk/itm/Mini-GPS-T...0AAOSwA4dWFgoQ



Very small ... only 2G mobile but ? Not too expensive ... about $35 ... plus 2G simcard.

or ...

2.
Here's a unit that could be used ..

http://www.ebay.co.uk/itm/Tracker-Ki...QAAOSwgY9Xf4CO



Switch on Rx and it beeps when distance to Tx is greater than set distance ... once you get close to Tx ... beep stops ... I know its reverse idea - but still workable I think.

3.
http://www.ebay.co.uk/itm/Global-Loc...1%26rkt%3D1%26



Bit bigger ... maybe too big for our use. This is touted a lot on eBay but in fact is NOT GPS ... it is only GSM location and that is not accurate enough for us ...

... I'll keep looking !!

Nigel
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Old 10-03-2016, 03:20 PM
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Looks like the Kiddies Watch is winning the listing at present ... thanks to Swiss Flyer for highlighting ...

http://www.ebay.co.uk/itm/3319845267...%3AMEBIDX%3AIT



Nigel
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Old 05-02-2017, 05:33 AM
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Just recieved 2 of these. They beep for 2.5 hrs after no movement of your aircraft. It has an internal battery that charges off of usb or your aircraft while flying. It is highly configurable. I'll be buying more!


http://www.nichemall.net/index.php?r...&product_id=50
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Old 05-02-2017, 11:08 PM
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Nice find WO., the one I bought for $39 is super loud, but....if you go down in thick grass like I fly over the signal gets blocked and you need to be right near the downed drone to find it. My loc8tor came in handy last weekend for finding the 200mm quads. each quad has a tag on it.

The drone keeper is on order for me to try out. I hope its as loud as videos make it sound. As for my hearing, I should carry a traffic cone to hear the high pitch these beepers give off. the older I get the less high notes are noticeable
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Old 05-03-2017, 03:10 AM
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The one I tried was a POS. Could not find my keys in a totally quiet house.
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Old 05-03-2017, 07:23 AM
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That's the biggest problem I have found with the ones I bought - lack of sound volume. Fine when in house / quiet clear area - but in grass - near useless.

Nigel
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Old 05-08-2017, 01:38 PM
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OK, I've been out of it for a while so this question may be obsolete, but with all the (mostly useless I.M.O.) telemetry gizmos that gets stuffed into model aircraft today, has anyone thought of one that sends back to the TX or a cell phone it's current GPS location? No silly searching for an alarm, just go to wherever the plane went down.

Seriously, if we can accurately track a 'tiny' spacecraft from billions of miles away....
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Old 05-08-2017, 03:14 PM
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Originally Posted by FlyWheel View Post
OK, I've been out of it for a while so this question may be obsolete, but with all the (mostly useless I.M.O.) telemetry gizmos that gets stuffed into model aircraft today, has anyone thought of one that sends back to the TX or a cell phone it's current GPS location? No silly searching for an alarm, just go to wherever the plane went down.

Seriously, if we can accurately track a 'tiny' spacecraft from billions of miles away....
I have such a 'gizmo' bolted onto side of my Phantom Camera Drone.

It works on the GSM system with a PAYG card in it ... you send a text to it and it links to your phone. Model goes down ... you text your code to the 'gizmo' - it sends back GPS coords and you can also see on a map exactly where it is.

Does it work ? So far unreliable but I think its the network rather than the gizmo ...

Nigel
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