Hello,

I'm working on a light weight light trap based on Bjerge et al 2021, however I opted to use an ArduCam 64mp (9152 x 6944 resolution). Designed for the pi specifically and at $60 it checks many of your criteria. I haven't put everything together yet so I can't speak for white balance and power usage, but the autofocus appears to work well from initial tests, and it is tiny.

Cheers,

Hubert

Hi Roland,

This is really amazing, great to hear about your set-up! I'm just wondering what the overall cost was to set up this system? Just thinking in terms of setting up something similar in other parks and what they should expect with regard to price. Would also be great to hear about the overall effort, e.g., hours/team members required. It would be great to have this act as a blueprint for other organizations/research stations wishing to deploy a similar system within their respective national parks/areas/etc.! 

Hi Rolland,

Interested too, but why did you choose SigFox (a private network) rather than LoRa (open network)? 

Sigfox currently has some financial troubles that, don't know what it will become in the long term.

You might check out the devices listed in the Conservation Tech Directory - you can search for 'acoustic recorder' or 'ARU' or something like that.

The most common off-the-shelf models (other than Frontier Labs' BARLTs mentioned above😊) are Open Acoustic Devices Audiomoths & Hydromoths (which may be particularly useful for you since they come in completely watertight cases that can be stuck underwater for deployments), Wildlife Acoustics' SongMeter series, and Cornell Lab of Ornithology's Swift units.  

Camilo--

Are you interested only in airborne sounds or do you want to deploy hydrophones? That decision would inform a lot of other decisions about your purchase of equipment, as would having a clearer picture of your budget.

Hi there Camilo, 

What an interesting project! If you are looking for a lower cost, but effective tools for acoustic monitoring you might want to look into two options: 

SoundTraps - are very commonly used and perform quite well: 

SonarPoints - these are also a great instrument option: 

I see, thanks!

One daily fix is quite limiting.

Do you have an idea how KEH might affect accelerometry?

Cheers,

Realizing I'm hopping onto this thread late, but I think one of the easiest ways to handle batteries is simply to work to minimize energy consumption--identify areas where we can improve deployment duration while generating comparable ecological knowledge. For example, in the case of the acoustic sensors I work with, can we reduce sample rates and still pick up our species of interest? Can we use a sparser duty cycle while still generating sufficient information to answer whatever our relevant questions are?

So-called "Li-Ion AA" batteries are a potential alternative to NiMH for applications requiring AA form-factor batteries.  These "batteries" contain internal power converter to go from Li-Ion cell voltage (3.7V) to AA standard 1.5 Volt.  Based on lab (not field) experiments, they perform better than NiMH over temperature, and have a longer lifetime,  though they are more expensive.  I suspect they have the same (eventual) disposal issues.   

On the topic of potential sources for harvested power, and in the category of "out there"...   I have spent some considerable (likely too much) time exploring harvesting power from diurnal temperature variation using thermal reservoir(s) and thermo-electric generator(s).  The physics is not too bad, but the engineering is a bear.    Project currently on hold, but if someone is interested, happy to discuss.