Hi all,
I am working on a drone project, I want to design a reliable wireless mic system that communicates with a speaker attached on the drone which can be used as Public Announcement system. Something like this :
I've come across this 433 MHz tx, LoRa and HC- 12 etc. Pls suggest and guide how can i achieve. The voice from the wireless mic should be clear so that people can hear the announcemnet from a certain distance.
Any sugestion will really help me 
Thanks in Advance
Regards.
why don't you use a walkie-talkie from the market - some have an audio line out. you can get rid of the enclosure and keep the bare minimum.
With a certified product from the market, you'll be sure also to follow the rules for radio communications
Very often significant difficulties using digital type RF modules or similar for audio and the like due to legal limits on duty cycle etc.
If the drone is in visual sight then range should not be an issue for a lot of the readily available 'walkie talkies'.
Check your local and national rules, they are very specific on remote control devices, frequencies, who/what is in control etc. There are also a lot of rules of what you can and cannot do with drones.
Hi all, thanks for your replies, Can't we make a setup like that for development purposes even? I mean there are so many drones flying out there with so much tech. Even cameras. For ours, its a micro drone F450 frame. And the drone will not be in visual sight. Thats the objective of the project that we will be monitoring remote areas. So maybe less that a km, but not in sight. Will a walkie talkie work in that?
Regards.
Walkie-talkies, especially those operating on UHF frequencies, can work reasonably well in non direct line-of-sight conditions
Check the regulations in your area. In my area (UK) for instance I believe you can apply for a development license for some stuff, but its not an automatic right.
Not legal in my area (UK) for instance.
We do not have to use the drone apart from the intitute we are working in. Maybe not even fly the drone with the walkie talkie. We just have to present the working system mounted on the drone. Its just a proof of concept.
Is there any option to upgrade the speaker in to a higher volume output?
If the provided speaker was not loud enough then you would need to use the audio out jack, an amplifier and a better type of speaker.
Just wanted to know can i swap the existing speaker to higher wattage speaker?
it depends on what you'll find inside. It's likely tuned to the existing speaker.
the audio out seems a better option to connect to an external speaker for which you can tune the audio
The level of audio output is really governed by the power of the electronic amplifier in the walkie talkie and not by the wattage of the speaker.
Surely it is a prime requirement that a drone should be able to fly.
Exactly how big is the drone and how much weight can it carry ?
Meaning I cannot make this at all.
Am I right?
if you know what you are doing, you can modify the board. But just swapping the speaker won't be enough
You can of course swap the speaker to a higher wattage thing, but it's not going to make a difference in sound volume. It may actually decrease the volume as the bigger, heavier speaker may not react well to the low power output of the walkie talkie's built-in amplifier.
Don't mix up "speaker" with "amplifier".
If the sound volume of your walkie talkie is not enough (a typical drone is indeed louder than a typical walkie talkie) you need an external amplifier with speaker, and an additional power source (battery) for it.
A quick search for "micro drone F450 frame" tells me that this thing can not carry much payload, probably a stripped down walkie talkie is too much weight for it already.
I think it's time for you to do some research on walkie talkies, speakers, amplifiers, etc, find what you need to make your PA work based on your requirements - distance, height, volume at the ground, then figure out the total weight this contraption is going to be, and find a drone that can actually carry it.
I've seen this
Model: Flame Wheel 450 (F450)
Frame Weight: 282g
Diagonal Wheelbase: 450mm
Takeoff Weight: 800g ~ 1600g
Recommended Propeller: 10 × 3.8in ; 8 × 4.5in
Recommended Battery: 3S~4S LiPo
Recommended Motor: 22 × 15mm or 22 × 12mm
Recommended ESC: 30A OPTOLanding gear:
Weight(Single): 15g
**Height:**130mm
That's more detailed that what I found in a quick search, where I also found comments in lines of "can not take any extra payload after adding the required parts and battery".
Frame weight is excluding the battery - the OP wants to fly for 1 km (and even out of visual range) with a significant payload so they will need a largish battery. Those things are kinda heavy. Other major parts like the ESC is also seemingly not included yet.
Also it doesn't have a camera yet, which is pretty much mandatory for flying out of sight as otherwise you're truly flying blind. More weight to be strapped to that drone.
To get to the 1600 gr take-off weight means upgrading the motors. Whether the motors are even in that frame weight is unclear from the description.
All in all not much weight allowance left for a PA system. One that can be heard over the noise of a drone to boot.
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