neilh

Its a good discussion, and I’m interested in the context of the study of intermittent streams.

There are a lot of examples of detecting “water leaks”, that is the physical situation of going from no water, to “tap water” – a relatively low TDS water.
For an intermittent stream, I imagine its going from a physical water present (with potentially…[Read more]

The mayfly can generate a square wave which can then be filtered/rounded to a sinish wave. It would still need to be amplified with a low current op-amp

For TDS trials I personally would start with something like this, though might need more research – it has methods of calibration. The qu is just what sort of value does the results…[Read more]

Also
https://publiclab.org/wiki/conductivity_sensing
which has
https://publiclab.org/notes/bhickman/05-09-2016/conductivity-and-temperature-meter

Cutting the rod in small diameter wasn’t a problem for me. Ideally it should be a square cut.
Ti oxidation layer protects it https://cdn.ymaws.com/titanium.org/resource/resmgr/2010_2014_papers/HouserRobert_2011.pdf

You may have two different sensors if you want to be able to do “water detection” v “conductance”
Also depends on power…[Read more]

I look at the measurement accuracy, and vented depth sensors. Especially at lower water levels vented depth sensors are I believe the most accurate.
Good measurement accuracy starts at about 0.25% of range and optionally can be of 0.1%
I’ve been using the Keller Acculevel for ranges over 10′, and characterizing the Keller Nanolevel for ranges…[Read more]

Hi Charles,
I’ve used titanium rod – 1/16″ Dia 2′ $1.62 – https://www.mcmaster.com/89145k28
and its easy to crimp a wire to the rod. I might be able to find a picture of it at some point.
Its also possible to drill two holes through a PVC end cap, and then snuggly push the rod through with a watersealant adhesive on it – uses the friction fit…[Read more]

Hi Erik, Sounds like we ended up working on the same issue at about the same time.
Great to hear you have a basic path forwards. I am very much a fan of the open source ModularSensors and EnviroDIY which covers a lot of functionality.

However, it is a matrix of south bound (away from internet) instrument sensor interfaces ~~which are…[Read more]

Sara sorry about the stomach bug. Life is challenging when the rulers of the internal ecology get distracted with nasty bug invasions.

thanks for the fix ~ I just noticed this conversation today.

I think it was working with the AVR compiler as I had it all working for many months on a Mayfly (except that specific Mayfly got stolen last year).…[Read more]

Thanks for the front door 🙂 eTree was going down a whirlpool!

This worked for me, though maybe there is a nicer way.
The output is value_num – which can be used for the threshold check.

import…[Read more]

Thanks for ulmo reference – I can sort of see something there, but its got a lot of layers and I can see it understands the response from a http://data.wikiwatershed.org/wofpy/rest/1_1/GetValues?
of the form
<timeSeriesResponse xmlns=”http://www.cuahsi.org/waterML/1.1/” xmlns:ns0=”http://www.cuahsi.org/his/1.1/ws/”>

Well in the spirit of try…[Read more]

On the ThingSpeak thanks for pointing it out – they have become painful. I have a number of legacy connections I’m setup up for.

Not knowing the architecture of the ODM2/WOF and WaterML 1.1 it was more of a reference.
Thingspeak used to be a lot more open, but Mathwork$ acquired them, and I guess they are making money out of it.
Which is to be…[Read more]

OK I think I’ve figured out something. I can only get the last variable at the moment (432) .. which is what I need for my real analysis of looking at the last value of the voltage returned and and checking it it has dropped below a threshold.

http://data.envirodiy.org/sites/TU-RC-01/ visually its 16.0V the first Battery Voltage…[Read more]

Gosh @srgdamiano wonderful!. ..

As every another question … (thankyou thankyou in advance)

So following the examples and trying for some GetValues on EnviroDIY_Mayfly_Temp from
https://data.envirodiy.org/sites/LCC45a3/
with this…[Read more]

To piggy back on this discussion – I’m wondering if anybody (@srgdamiano?) knows if there is a way of doing a POST/GET to request data from the ODM database for the latest row, or be able to access latest readings via WaterML.
The readings POST structure is described…[Read more]

I had a similar problem – see my comment in https://www.envirodiy.org/topic/trouble-registering-with-lte-m-network-on-hologram/
The fix that seemed to work was if it didn’t connect after a 100 AI status polls it issues
gsmModem.sendAT(GF(“+CREG”));
Search for +CREG in…[Read more]

Yup – the network is challenging when making it work, and adding to the biggest and most diverse machine in the world.
I’ve been more the old wireline, POTS to ISDN (now ADSL) – moving the analog to the CircuitSwitched Digital, and now its packet switched.

Though when I was working with one customer, when our product wasn’t connecting to the…[Read more]

No problem – I appreciate the earlier tip.
What I haven’t figure out is there another manual that specifies +CREG cmd – it isn’t in the user manual I’m using.
I have seen it before where latest manual “inherits” a context of another set of cmds specified in an common manual.

Thanks for the tips here.
I’ve also had trouble with a new Hologram SIM registering to the cell network with a Digi XB3M1.
I had a working hologram SIM that connected straight away, and then would power off and swop in the new Hologram enabled SIM, and it would poll the cell tower and not work.
I started trying about 2weeks ago, had to move on…[Read more]