Hello @ThomasGray_Argos ,

I need to add transmitting component, so please provide me the list of these. Actually, I don't know much about it. I am interested in learning new things.

I am new here but a real enthusiast and loving this community so far. I have a background in technology and feel I could help with documentation, at least for starters. If you have any other question apart from this, you can ask. I will try my best to solve your problem. 

Sorry @Paloma  - somehow this reply escaped me. 

There are different transmission solutions depending on what you are trying to transmit, how much, how often, from where, etc. In general, you have local systems, acoustic systems, and satellite systems with a number of different providers/solutions within each. THE Inventory might be a good place to explore.

Honestly, no (at least not for wildlife applications).

I suspect for the manufacturing community it's a balancing act, and I am not confident that the manufacturing community has invested a lot of resources or effort to integrate sustainability in their tag designs specifically related to the materials. Reasons that come to mind are material durability and cost (both materials costs and cost to for R&D). 

With that said, I think Stuart (below) makes a good suggestion...

We are ready to make efforts on materials, but today there are few solutions available. Today, our partners' R&D efforts are focused on renewable energies and the energy source's capacity. In the absence others solutions, and to take action, we have chosen to develop solutions to recover these tags, some of which are reusable (thanks to Gonio RXG-234 @ThomasGray). To date, thousands of tags have been recovered and some reused. This is the "upcycling" of science! It's a small step, but a great leap forward!

Same issues here. A MEMS is a great idea to pot, but you really need a piezoelectric element for this to work and not a MEMS based on capacitance (btw they're all capacitance, except for one now discontinued...). It was originally made by Vesper, but the company was bought out last year and the MEMS is no longer made. 

This is because you're no longer really doing a typical microphone, this would be a contact type hydrophone. For waterproofing, you can actually get a waterproof MEMS. As long as your not submerging this for an extended period, it should do the job. Be sure to keep the cable short between the PCB and the mic as you'll get noise as I've experienced. 

For generally answering your question on the "best" epoxy to with sound transparency, in general the harder the material the lower the acoustic impedance. I use Epotec 301 resin with a hardness of 85. Your shape will also influence the resonance frequencies, meaning the flat frequency response will now be distorted and you'll probably have distorted audio. . 

You generally don't want to pot MEMS microphones since they're designed to pick up on air pressure changes and adding any material in front of the microphone just introduces another transition layer where pressure waves need to propagate through. Also, potting the MEMS microphone can be tricky since if you get any material in the port, you could damage the microphone or drastically reduce its performance. If you want to seal something with epoxy, take a look at contact microphones. Higher frequencies will be attenuated but depending on the application, it could work. 

There are companies, however, that design fabrics that are waterproof/resistant but have a relatively low acoustic impedance. SAATI has a variety of samples that you can request and GORE makes Acoustic Vents that could work. You can design a mechanical housing around your MEMS microphone with small perforations that are covered by one of these materials. I did this for one of my latest projects and it holds up just fine in heavy rain conditions. 

That's my kinda crazy @Rob_Appleby. Reminds my of a concept from my last job where they were trying to create strain gauge power meters that customers could self apply to their bikes. Normally this process was done in factory using special CA glue cured in 50-90c ovens. For the self applying version they were experimenting with an adhesive that had tiny metal beads in it that would heat up when a current was applied to self cure if I remember correctly.

Now I want to be able to drop it from a drone and have it glue itself to the fur of a deer or wild hog. I am designing that now, it will have a detachable lawn dart that drops from a drone and lands on a target animal. That lawn dart delivers the payload, either a tracker or a dose of contraceptives. Then the drone comes and picks up the lawn dart again for reloading. 

So the lawn dart has a small compressed air cylinder and some pneumatic style switches. When it touches down the switch actuates and the compressed air energy is used to deliver a dose of drugs and or spray some glue and  ink. That can be reloaded with a bike pump and hypodermic.

I am working on that too haha. So in my design you load the glue gun with two part Loctite, it has two separate metal rings. Glue and hardener in each ring. Then each ring has a few tiny holes drilled, and you fill the holes with a disposable plug. 

When the switch is actuated the pressure inside the metals rings goes from atm to 100kPa, and sprays the glue and hardener together as the plugs blow out. The transmitter is attached to the plugs, so it is left behind and glued in place with one switch. That loctite glue is basically instant. The whole thing would not even be that traumatic to the animal. When you score a hit, you find the lawn dart glue gun again and pick it up with the drone. 

Thanks @Freaklabs, I think you'll really enjoy getting involved with this too as we're looking for input from makers in the community to get the most from the approach and to capture features and usability ideas from a large number of people.

I've a new modular drop-off tag build using @Rob_Appleby's original SensorDrop board that I think would be great for this project too to see if we can drop different compartments, or do various different timed events with the one TimeLord board.

Most importantly, we have to make it play a MIDI version of the DoctorWho theme song when you arm the device. That has to be the #1 feature if you ask me!

 

Reminds me that we should look at both terrestrial and marine applications when we get stuck in to the demo builds to make sure we cover use cases 

'Most importantly, we have to make it play a MIDI version of the DoctorWho theme song when you arm the device. That has to be the #1 feature if you ask me!' 

Seconded!

Hi Brandon,

I agree and think VHF will always have better range than UHF. Given how commonly it's used in wildlife tracking, it also makes perfect sense to use it if possible. The trade-off for us was to go for lower cost and higher availability parts. This is particularly a problem for VHF receivers, as you mentioned in your original message. But, SDR is good option potentially for VHF (and UHF), especially given the success of MOTUS. 

Range of our 433MHz UHF tags was usually around 250m (up to 500m) LOS, using an external antenna and a high transmission power. We also used high gain, omnidriectional antennas on the receiver end. Tags were triggered by an accelerometer threshold so that they'd save a bit of power whilst animals were resting. 

More than happy to discuss further and help if I can. 

Cheers,

Rob

Hi Greg! Your Iridium tags sounds really interesting. I tried looking you up on

Read " " on www.spoortrack.com

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www.spoortrack.com

but there is not much to be found. Can you provide more details and images of your tags? 

Cheers, Lars