neilh20

@cameronlight,    I had a suggestion to try replit.com – enabled an account and it allows 10apps to be built free.

I tried “Create a curl script with Oauth2 access to post 3 values to google sheets”

I was logged into my google account, for latter testing. When asked to allow replit permissions pretty have to allow it all it seems, p…[Read more]

Oh very interesting needing to be clear about security of readings. Hard to do but a requirement for some property owners.

I was interested in doing something with sheets, however it was to learn about Oauth2 security as I remember.  Obviously security access for google is core to the simplicity of their interfaces/APIs – but how does it work.…[Read more]

Hi @cameronlight, gosh fascinating to do some lateral thinking.

You would need to publish your whole program – preferably on a traceable git, like github.com.

The challenge in software is abstracting the complicated stuff (service layers) to make it look simple by encapsulating it into a simple interface.

Its always fascinating when someone…[Read more]

Well as you can see this thread is almost 3 years old. I haven’t tried anything more than what was mentioned above. Your analysis is solid however its dealing with any current pulses and battery voltage measurement circuit.

I’ve had some response from  staging.monitormywatershed.org:80

but then it seems to become unreliable.

https://github.com/WikiWatershed/monitor-my-watershed/issues/752

Nuts that it sounds like the switch might be oxidizing. The switch solves a power vampire problem by switching off the CP210x – so I would expect the processor to carry on working.  You might check what the humidity levels are in the unit, ensure that its largely isolated from fogs and possibly put in some dessicant to dry it out. At one point I…[Read more]

Hi Eric. this is a voltage sensor, so it fits a pretty basic type of sensor, measure the voltage and then translate it to depth.

For a sensor, layers of calibration give value. Calibration of the sensor to defined units (V to mm), and calibration of the water height to the measured height in the flume.

The accuracy sounds pretty reasonable, for…[Read more]

Good to hear. and definitely very interested in use with a flume.  What range of water depth measurement are you looking for and depth accuracy of measurement.

Typically, because  ADCs are got good around 0.0V and rail – the Sensor range from 0.0 to full range, the Voltage range is from 10%Rail to 90%Rail (eg 0.3V to 3.0V for 3.3VDC rail) and t…[Read more]

Hi Eric – I’ve purchased and looked at using the eTape.

I was just wondering what made you think they are “calibrated” – that is the “0.0” markings relates to a defined voltage.  Usually this is shown for a calibrated sensor.  Similarly for a Full Scale relates to a known Voltage.?

looking at the graphs,  they describe “0-5VDC Linear Re…[Read more]

Hello Elliot, gosh too bad for the experience. Its a core issue of how to ensure there is enough power, and then also recover from low power events.  However to be able to get some help its best to post the details of the two systems.  Need to phrase the problem with enough detail that some one else might be able to comment.  Battery size and so…[Read more]

Hi Jake, no “pressure sensor” is going to be able to be linear/accurate if ice is forming and expanding in the protective enclosure round the pressure sensor. My guess is  the whole sensor would have to be specially designed to allow for the ice expansion to even survive a freezing event.

My hypothesis (guess) would be that its the nearly…[Read more]

I wonder what the water temperature is, or if there are water temperature changes, when this is happening.

From the graph it reads the water level is at 20″ depth then on the 10th Feb it drops by up to 5″ for some  time (hours?) before recovering, with 3 other similar but not us pronounced events

IF any for of ice could build up in a pressure…[Read more]

@d_manning just wondering if you have had any insights 🙂

I did some blog posts in 2016 with a number of depth sensors that quoted an error for a very wide temperature compensation. They where the Insitu LT500 (best), Keller Nanolevel, Keller Acculevel, Keller Level gage (worst).

I setup a situation with the depth sensors in a jar of water (low depth)  with a good solar aspect to test how well they met…[Read more]

As you say from 2nd sept – something changed, after that it looks to me like its is triggered by the temperature changes. Its just a visual analysis, but also using the conductivity. With a rain event the conductivity also typically changes, and of course temperature can change.

For daily diurnal cycle after sept 2 the temperature starts varying…[Read more]