neilh20

Hello Anthony, yes thanks for the clarification.

As an engineer, I am often asked is the solution more painful than the problem it is solving!

The problem breakdown, when looking through the eyes of hydrologists  ; a) is the remote sensors working?, b) is the delivered data to the web reliable? either visually or downloaded  c) how to back-up a…[Read more]

Hi James, as I understand it you are right – its difficult to get an accurate rating curve under such conditions. That is the geology.  That is why there are hydrologists, and it takes having someone with experience to find  if there is a geological place  where a rating curve can be built.    regards

Hi Shannon, do you know if they are using temperature compensation for the sensor on the Generation2. ? thanks

Hi James, yes there is the challenge.     My take way from the report was that providing its exceeding 1cfs or 0.028m3/sec it can be done fairly accurately with traditionally USGS methods – which sounds like you are well in that range.  For environmentally significant flows in drought California we are often looking at less than 1cf…[Read more]

I’ve been seeing gaps, lost data as well.

Checking this morning there has been no gaps in my test site

UTC 2021-05-12 11:45   or PDT    2021-05-12 3:45

Do note that the specifications says accuracy  0.5% of 10,000m or +/-5mm. This  implies that you want to keep it at a constant (20C?) while sitting in the bucket, and even then the apparent water level can wander up  +5mm  or down -5mm and still be within specification.    If the temperature changes then the accuracy specification doesn’t apply…[Read more]

Sometimes there is no easy answers. I recently went to presentation that included this analysis for

https://creeklands.org/wp-content/uploads/2021/02/CLC-Micro-Flows-2020.pdf

So partly what range of flow are you looking for and what accuracy.

Hello James,  yes I have a few that are working,  that’s the way that they have been working up to now. I would think you’d want to test to your 10 ASAP.   For me the devices that did not work, they just they didn’t work. So for testing its they either work or not.  As an electrical engineer I did do an analysis and laid out what I had done…[Read more]

https://github.com/EnviroDIY/SensorModbusMaster/issues/14

In a nutshell, the low cost RS484 hybrid often doesn’t work. Technically the QA of the workmanship is untracked.

My test06 system froze for a 2nd time. This time I pressed the User Button, which is also tied to an interrupt, and started up again.   I have made some updates described here. https://github.com/neilh10/ModularSensors/issues/34

Ok thanks.

An update to my stability testing, this partly makes me collect the dates and status.

A test system “tu_rc_EC” standalone EC “Stream Disconnect”  monitor built on 0.25.0 has been running since the beginning of Oct very well. I plan on describing this and haven’t done so yet.

The “TUCA-NA13” remote Verizon wireless system in the wilds measuring…[Read more]

Hello @shicks  ~ I’m just following up on this as I’m respinning my  Modbus Board  https://github.com/neilh10/SensorModbusMaster/blob/release1/hardware/knh002-MayflyWingShield/rev6/knh002r6_rs485schematic.pdf

to have a SDI-12 interface, and your board got me thinking .

The Mayfly socket has +5V and +3.3V and the board can have the boosted +12…[Read more]

Hello @shicks thanks for the response. I was thinking partly of the SDI-12 specification modules driving 5V back into the 3.3V ports.  The Insitu LT500 that I’ve been using does respond to Mayfly driving it on 3.3V, but then drives back SDI12 specified 5V which has to be mitigated.

Do you see any issues with the level shifter and the port…[Read more]

I’ve been working on a next revision board. Details at https://github.com/neilh10/SensorModbusMaster/tree/release1/hardware/knh002-MayflyWingShield

overview at https://github.com/neilh10/SensorModbusMaster/tree/release1/hardware

I don’t have any time frame on availability due to the world wide shortage of parts, but probably third quarter this…[Read more]

I’ve created a low cost monitoring console using a Raspberry Pi and FTDI cable. This allows a release debug OUTPUT to be monitored just as if it was on the console and compared to https://monitormywatershed.org/

https://github.com/neilh10/ModularSensors/wiki/Test-monitoring-host

Thanks for the input, ~ Yup that is what did it for interfacing with the LT500.  I brought in each change from Dec 1st till I found it

Doesn’t make a lot of sense to me why that impacts the protocol, but in dealing with a bug, the first stage is Detection, 2nd stage is Isolation, 3rd stage is Fixing it.

The Isolation in this case took a couple…[Read more]