Welcome to EnviroDIY, a community for do-it-yourself environmental science and monitoring. EnviroDIY is part of 
@neilh20
Active 1 days, 18 hours agoForum Replies Created
-
AuthorPosts
-
Hello I’ve just had a request to quote for a number of water monitoring devices, each one includes a Mayfly. I’ve put on the response quote subject to availability of the Stroud Water ReseHello I’ve just had a request to quote for a number of water monitoring devices, each one includes a Mayfly. I’ve put on the response quote subject to availability of the Stroud Water Research Center’s Mayfly.
Is it useful to be able to indicate potential demand?. Its a pretty typical thing for selling that there is a demand forecast.
Some amazon listings indicate how many are in stock, that would be useful to now.
When I request amazon if I can put 20 units in my shopping basket it says there is only a limit of 10 allowed.Just checking what the thoughts are for scaling availability?
Hi James, thanks for the agupubs reference – very nice to see the LiDar work.
I had talked to a LiDar guy some years ago and they had said they didn’t think it would work for streams, butHi James, thanks for the agupubs reference – very nice to see the LiDar work.
I had talked to a LiDar guy some years ago and they had said they didn’t think it would work for streams, but that ref is showing it very nicely.I’ve used 20mA depth sensors with Onset loggers, and had a couple of UL6a https://www.utopsensors.com/pressure-measurement/level-transmitter/liquid-level-sensor.html
It depends on what accuracy you want and over what temperature range. As the pressure sensor is the most critical cost component, a low cost resistive element, usually has an uncompensated temperature range. If you are pretty confident in little water temperature range for the stream depth when you need the most accurate readings then they are very useable.
If, as I’ve blogged and mentioned above, you need accuracy at low stream levels when the water temperature may have a large (10C?) diurnal swing then too much error can creep in.
For ground water situations, the temperature may hardly vary and there can be a large range in water levels.For a stream loading looking at peak flows seems like range of interest are at the upper end, and the rating curve probably has the most error in it. 🙂 Just a guess.
One way to try it would be to use RS485 wingboard that can take a switched +12V generator, and screw terminals, with an appropriate high accuracy and stable temperature 50ohm resistor 0.05%, (0.020A * 50ohms = 1V) feeding via plug-in lead into the ADS1115 ports on the Mayfly you can get a reliable accurate conversion (0.1%)of the 4-20mA to a digital reading.
The 4-20mA is valuable, as only two wires, and if the loop breaks ~0mA ~ its an error condition. If the line short circuits, then its typically over 20mA and again error condition.I did give up on Utop when I got one of their sensors with a combined temperature sensors in it, and the temperature calibration was way off. I queried about it, and didn’t get a very satisfactory answer.
Interesting idea for a secondary board, perhaps linked into the USB. I have heard it done before via the JTAG, but I don’t believe this is available for Mayfly.
Possibly the biggest question onInteresting idea for a secondary board, perhaps linked into the USB. I have heard it done before via the JTAG, but I don’t believe this is available for Mayfly.
Possibly the biggest question on issues like this is power budget. If there was a reliable power budget for a linux SBC (beaglebone.org) it would be relatively easy.One area to track this new feature request could be
https://github.com/EnviroDIY/ModularSensors/issues/220Just a thought, another potential would be to look at the value of a next generation board, with that capability built into the chip. Since that ticket @220, where I’ve identified a method on issues/220 on how it could then be upgraded, I’ve been keeping a lookout for methods. I personally like the SAMD51 of which there is a lot of software support, and has the port capability for managing halfduplex comms which is the core of SDI-12.
Hey happy to contribute where I can.
My wife and I started a trip in Hamilton with some friends in 1990. Spent 2 months traveling round NZ as part of a round the world trip. 🙂I have a fork of Modu
Hey happy to contribute where I can.
My wife and I started a trip in Hamilton with some friends in 1990. Spent 2 months traveling round NZ as part of a round the world trip. 🙂I have a fork of ModularSensors and focus on a small subset of sensors, scaleability through ability to build releases, download a defined binary of the code, and test specific configurations
https://github.com/neilh10/ModularSensors/wiki
As and when there is a request, if its useful, I’m happy to migrate from my fork back into core software. Personally I’m following the traditional path of a multistream development, git supports so well, and where its a good place to stabilize releases.I’ve got a release of new features with reliable delivery to MMW that is working well with Xbee LTE.
IHMO, I’ve always found there is work in defining a sensor configuration, testing it and then managing the stability of it through defined releases.
Be happy to chat more.Hi James, great to hear someone else interested. I just got a “relative EC” working nicely and gave them out to be deployed last week.The “relative EC” is to be able to meas
Hi James, great to hear someone else interested. I just got a “relative EC” working nicely and gave them out to be deployed last week.The “relative EC” is to be able to measure stream disconnect. For the <<dry>> hot climate we have in California, looking to monitor when the stream goes dry.
There is no reason why it can’t calibrated. Need to pay attention to a few specific components, and of course determine what accuracy you want, and can get.
I’m in process of putting a package together as Open Source Hardware.
I’ve developed a board and MS sensor software that interfaces on the Mayfly Analog port using the internal ADC, (tested), for the “relative EC”.It optionally, (not tested), can be built to be plugged into Seeed connector with the more accurate ADS1115.
So the unit spec iw to be standalone, with 40′ of cable, and bootnet access(walk up remove microSD) and looks like this
https://github.com/neilh10/ms_hardware/blob/master/ec_analog/Ec%20Asm%20with%20sensor%20cable%20(Large).jpg
and the internals running with an standalone 3.6Vbattery
https://github.com/neilh10/ms_hardware/blob/master/ec_analog/Ex%20Asm%20Top%20(Large).jpgWhat is the Turbidity and Depth sensor you are looking to use ?
How are you looking to access the data?
How comfortable are you reading circuits and building a PCB from a BOM?I have come up with an inline plug-in circuit that will do the voltage shifting ( and generate a +12V power and ESD protection) that I’m working on, so just mentioning it here. If anybodyI have come up with an inline plug-in circuit that will do the voltage shifting ( and generate a +12V power and ESD protection) that I’m working on, so just mentioning it here. If anybody is interested in the discussion we could take it to a separate thread.Attachments:
Just an FYI, as I understand the SDI-12 spec, the receiving instrument should receive 3.5V for a ‘0’ or space.  The mayfly port is only capable of supplying 3.3V – so it may worJust an FYI, as I understand the SDI-12 spec, the receiving instrument should receive 3.5V for a ‘0’ or space.  The mayfly port is only capable of supplying 3.3V – so it may work for most SDI-12 instruments, and is working for one SDI-12 instrument I’m usingTypically with off-spec issues, things can work on some instruments and then not on others. So hopefully the problem is something simple, but just sharing my analysis.
Attachments:
There is a Mayfly Protoshield rev1 – but I can’t find if its for sale anywhere.I have one, and no plans for it right now so if you wanted it I could send it to you.
The details are here
There is a Mayfly Protoshield rev1 – but I can’t find if its for sale anywhere.I have one, and no plans for it right now so if you wanted it I could send it to you.
The details are here, but no gerbers.  With gerbers it would be possible to order the base boards directly from oshpark.com
https://github.com/EnviroDIY/EnviroDIY_Mayfly_Logger/tree/master/hardware/protoshield
https://photos.app.goo.gl/ocKSN3AuoqvJJx1L8
I have a base board defined in my PCB package, I could look at what it would take to generate a PCBÂ and then you could order it directly.
This would be the simplest, small spacing 2.54mm/0.1″ using,
https://www.digikey.com/product-detail/en/on-shore-technology-inc/OSTVN10A150/ED10567-ND/1588870
but practically speaking, it could be any connectors that you define how they fit round the Mayfly 2×10 connector.
I have a PCB that fits on the analog side – for Electrical Conductivity Stream Disconnect for (which I’m hoping to to write up pretty soon ) so it would look something like this..
https://oshpark.com/shared_projects/WSMDBFEB
Hi Matt,There is a Mayfly prototyping board, which I should have used for one project, and forgot to 🙂
I’ve prototyped with a basic 2×10 male to male header using wire wrap and solder
Hi Matt,There is a Mayfly prototyping board, which I should have used for one project, and forgot to 🙂
I’ve prototyped with a basic 2×10 male to male header using wire wrap and soldering to the header. However I cut the 2×10 from a larger length I had, and it became unreliable pretty quickly. For a cable maybe 0.05″ ribbon cable with IDC headers, which I think only come in female (I haven’t checked for male IDC), and then a double male to fit into the Mayfly socket and IDC female socket.
Practically speaking, for an Electrical Conductivity that interfaces to the processors analog pins (J4), as basic as you can get I found the male headers unreliable.  I made a special PCB for it. I’m still documenting it going to share it at some point.
The response is great.For my WiFi/Xbee S6 accelerated updates 2min sampling update every 4minutes the ACK time over 700 POSTS time is between 200mS and 774mS. All POST succeeding 1st attempt.
F
The response is great.For my WiFi/Xbee S6 accelerated updates 2min sampling update every 4minutes the ACK time over 700 POSTS time is between 200mS and 774mS. All POST succeeding 1st attempt.
For my Verizon/Xbee LTE at 15minutes sampling the ACK time is typically 5sec, very occasionaly about 1.5sec, and also 7Sec. For this test it delivered the outstanding readings that weren’t delivered previously, and then the new readings.
I am working on new feature Reliable Delivery, as cellular wireless range can vary and be unreliable. Often though there are periods of greater reliability (wind in the right direction). So if the first POST attempt doesn’t succeed, it is serialized to a QUExx.txt file to be retried when there is a connection.
-
AuthorPosts
