LMB / LMA (Lost Model Beacon / Lost Model Alarm) demonstration
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- Опубликовано: 12 окт 2024
- Here's the video on how to build it! • DIY Lost Model Beacon....
I decided that I wanted a solution that doesn't reply on GSM signal, so I built a 433mhz beacon. This thing is now going to be my daily safeguard against loss!
I've got some 446mhz modules coming which will use the PMR (open) frequency in the UK.
Please check the end of the video for full spec.
A couple of suggestions Tony. Rat one of those $4 onboard cell checkers for the peizo buzzer and use it for an audible sound beacon for when you are close and the receiver is pegged out. You don't actually need a formal yagi, just a piece of wire say 5% longer than a half wave and hold it behind the receiver antenna acting as a reflector. Should give some reasonable directivity. Benefeit is it can be rolled up and kept in the flight box so you don't forget it :)
+Rob B You're just a wealth of knowledge, Rob. Thanks for that - I'll give it a go! The only trouble is, I'll probably forget the bloody flight box :D
Thats a nice boulder. I like that boulder.
Brayton Thompson I appreciate this Shrek joke
That's amazing. Be useful on anything RC. I have lost planes in the end. But to get close and active your list model alarm once your in the right place. Your a genius mate!!!
Nice one Tone. My orange openLRS has this feature built in and works really well too. If you turn off the rc transmitter the rx goes into fail safe then 1 minute later goes to beacon mode transmitting on your preset pmr channel. I spent an afternoon doing the same test as you with a pmr radio lol. However the openLRS receiver is set to transmit 3 audible tones with each tone at different power levels, so the first is 100mW then 50mw then 10mw so if you are far away you may only hear one tone and if you are really close you hear all three. This might be worth implementing in your design to further improve it. You may find your Ezuhf will already do this with a firmware update.
+crezzee Cheers mate :-) I know the OpenLRS has a beacon built in which does work very well but the EZUHF doesn't support it, although there have been numerous requests for it to be implemented. The trouble with these Chinese 433 modules is, they only have one output power. I could get a more expensive module but that'll double the cost - these will only cost around £4 to make and I'm VERY cheap :-)
oof that tone brings back dark memories. I can still hear her voice...
Funny enough I was just working out the values for the Lincolnshire Poacher just before you posted the video.
The Yagi should also give you a considerably boosted range as well as directionality.
The switch to PMR may be a good idea as you are limited to a 10% duty cycle on 433 ISM (not a problem if you make it for your own use but supplying them to others may make life awkward)
I'm trying to raise the enthusiasm to code one in straight Atmel assembler so you can just attach a bare chip to the TX module, but work is getting in the way.
+Rob Crawford If you need to sketch mate, drop me a note. It's not easy getting the oscillation timings right and I know mine isn't perfect but it'll do :D The smaller one I built is actually an attiny85 taken from a Digispark - I programmed it up, removed the chip and soldered directly to the legs.
+Vortecks the bare chip is definitely my preferred method (weight saving and more robust)
That's a kind offer but I wouldn't like to get the code then do bugger all with it ;)
There are also 900MHz modules which may be helpful to use (but not for use in Europe of course)
the other half of what I have been thinking about is what happens if you fit a yagi to the 433 receiver half of the module pair.
if the reception is decent then it should be possible to build a scanner free unit (but somehow I doubt the Chinese receiver is up to the task)
however if it was a decent receiver then you could use non audible signals
+Rob Crawford I was thinking about using the RX that came with the TX but the signal would only act like a logic gate. You could do a very crude RSSI by counting the packet loss but I don't think the receivers are very sensitive. I'm old school and prefer to judge things by static noise if needs be :DLet me know if you're having problems with the Linconshire Poacher, Rob and I'll send you the coding I've done. Use it or bin it...... I won't be offended either way :-)
Really nice little unit. As Rob Crawford has mentioned an antenna with directional properties would be small enough on the frequencies you intend to use without being too cumbersome. A simple tuned loop has a bidirectional property with very pronounced nulls to the sides. Or alternatively a two element design, known as a HB9CV provides great forward directionality with strong rejection from the back and can be folded to fit in a jacket pocket. On 144MHz there's a big amateur radio fox hunt event in this area once a year where they use very similar devices to the one you're demonstrating.
Regards
Nidge
+sputniksam Cheers Nidge. My Dad emailed me and told me to build a HB9CV which I'll be doing very shortly. I've built a yagi out of an old tape measure (using the tape measure as the elements) and I'll be comparing the 2......when the rain stops :-)
+Vortecks
Another crazy thought. Instead of the Baofeng consider using a cheap USB DVB-T dongle ( less than £10 ) with your Android smart device. The big benefit is that you can see the beacon's signal on the spectrum and waterfall display long before its audible on the handheld radio. Also the display is more dynamic than the crude signal meter on the radio. If you search for " RTL2832 SDR " and for the Android app " TouchSDR" . The only other hardware needed is an OTG cable to connect the Dongle to the smart device.
Regards
Nidge
+sputniksam Now you're getting technical.... I like it! I already have an SDR dongle and SDR touch installed. I might give it a go when I get chance :D
Is the output of the transmitter fixed? Could you send a stream of tones at descending power level? i.e. 100%...80%...60%...40%...20%...2%
Yeah, it's fixed. There's no way of limiting the output :-(
I need something exactly like this....just ordered the smaller transmitter that you showed in this. Is it possible for make it beep every 1.5seconds instead of playing a tune ?
Well done good sir,
I fly small quads and am very interested in your mini LMB as the craft we fly are small but very good at getting lost.
is there a web page with the plans. or do you sell the really small ones. Have quite a few others who are interested.
Cheers.
I didn't do an instruction video about the small one because the average person couldn't build it. I did do a video on how to make the bigger one though...... ruclips.net/video/xqPZ6HZy4GM/видео.html
I don't sell them and I don't use them anymore - I only use the tBeacon, they're far better! ruclips.net/video/QOkG72TdB10/видео.html
Thank you. I live in Thailand and there are many who would like this for their small things.. I LOVE your video for the larger version and have the parts on order for 10 to hand out to folk here. I have ordered the tBeacon for my self as well as a few of those Kiwi flavoured ones. Just trying to help out the local community where 50$ buys you a few months of lobster dinners on the beach... if your a Thai..
Will start with the larger ones and maybe pester you in a few weeks for more info on the smaller..
Cheers and THANK YOU!!!!!
Hi there. Just found your video. Do you still make the locator and if so how much do you sell them for.
Hi there, would you consider doing a review on a new Lost Model Beacon from Grineid Tactical Systems? Battery life is 14 hours, transmits over 1km away, the device with the battery mounted is the size of a quarter , weighing in at roughly 4 grams, apart from constantly transmitting for 14 hours straight it utilizes a hot mic that’s always on and transmits surrounding audio, as you approach the device you start to hear yourself which allows you to “call out” to your drone and hear your echo on your receiver as well as feedback from your actual receiver as you get closer, It’s honestly revolutionary. They are a Canadian company based in Ottawa, I have a few and I can send you one.
I would if youd like me to
way over my head but very nicely done
+zimmy1958 It's not too hard to do really. I'll be doing another crappy 'how to' video soon. For the cost of parts, it's something that everyone should have!
Hi, i would like to get the same melody as in the video but i cant find the right code anywhere...Could you send me the code?
Here you go mate 😁 drive.google.com/file/d/1s2yVDiaqKtYbRXd-Qvld5a5ECk0STcKF/view?usp=sharing
WOW, this was over 5 years ago and I still have the code 😂
Haha thanks, but when i upload it it only blinks twice every 5 seconds...
Caught my interest as that tune is/was used on one "number station" - Cold War era broadcasts to spies in enemy territory.
can you explain how you made that one with the button cells work with no pro mini ? and how was it in the test wee don't see it in the video and nice work by the way
+Mathieu Bissonnette-bigras It was done with an ATTINY85 and I decided it was too hard for Mr Average to build so I didn't do a video on it. I might do one for anyone who's advanced in building them, though.
Well for racing and fpv it seems like a good lightweight solution if battery would be ejected i almost lost mine yesterday in tall grass after my battery ejected so no telemetry to try and fallow the signal and non buzzer this would of made it easy with a yagi
+Mathieu Bissonnette-bigras When I get chance, I'll do a video - it only weighs 4g and will run on a single CR2032. Just a heads-up..... A supplier is sending me a sample of his version...... it looks rather good so I'll definitely be doing another review when it arrives.
looking forward on this and i was looking at some boards and stumbled on this one : www.banggood.com/HC-12-433-SI4463-Wireless-Serial-Module-Remote-1000M-With-Antenna-p-973522.html im wonderringf if with this one could program the tone leves like on the openLRS
+Mathieu Bissonnette-bigras I have a few of those - they're just a serial replicator and only used for doing a wireless link between 2 things. They don't actually do much apart from transmit whatever data you put into them.
Will you show us the specs for this somewhere? Since the model wont be powered off after it flies away - why not pull the power from the lipo?
+petfrogg I've had many a crash where the battery gets ejected. If it does crash and the battery is still connected, it probably won't last much more than 5 hours. If it flies off or crashes when the battery is nearly flat........ have I convinced you that it should have it's own battery yet? :-) I've had a few emails about how to build it, so I'll be doing another crappy 'how to' video soon :-)
looking forward to you "how to". And - i understand the concept of a battery of itself.
Take the antenna off the receiver when you get real close.
I want one (arduino) ................