I am so sorry. That error means that there is some kind of error with the calibration of the sensor. I will have one of my colleagues reach out to you with a return material authorization (RMA)  to have that instrument brought in to have the issue fixed. 

James

Just an update.  I uploaded ‘d_simple_logger’ to see what is coming directly from the sensor.  It seems that the sensor itself is producing the -9992 values, rather than it being created somehow by the Mayfly.

I have contacted METER and they are looking into it.  I suspect the sensor is faulty.

James

Thanks for your reply, and apologies for not replying sooner.  My replies to your message are in bold:

1. Do you have one of the Meter ZSC bluetooth interfaces for setting and checking Meter Group sensors? They’re really handy testing and troubleshooting things like their CTD sensors, and for changing the SDI12 address.  – <…

[Read more]

I have a strange error where my brand new Gen2 hydros sensor is reading -9992 for depth and conductivity.  Temperature is fine.  I have three other Gen 2 sensors deployed and they all seem to work okay (although they too have negative value drop-outs on occasion).

I am using a Mayfly 0.5 board, and this happens in isolation of o…[Read more]

-D MS_SDI12_NON_CONCURRENT

I am certain it is this build flag and not the voltage pin (previously set to 5v) because I uploaded my script prior to switching the voltage pin over and it su…[Read more]

Thanks in advance.

James

I have my SDI12 jumper pins for the CTS set on 5v.  Could this be the problem?  For some reason I couldn’t get the Gen1 CTD’s to work at 3.3v, but they wor…[Read more]

This problem has been causing me trouble for nearly a year, but it has become unworkable with installation of Gen2 Meter CTD sensors.

My problem: Meter CTD (SDI12) and Yosemitech 511-a Turbidity (MODBUS) sensors seem to interfere with each other causing the CTD to sporadically drop out return -9999 values. This only occurred at some…[Read more]

I have one Yosemitech 511-A sensor that turns on the wiper for approximately 30 seconds with each measurement.  The wiper doesn’t move from side to side either, it rotates in a continuous full circle for the full 30s.

Has anyone experienced this?  Is this a hardware fault?

James

Thanks for that.  I am using a Yosemitech Y511-A with a Hydros CTD (Gen 1).  My code is fairly similar to yours.  I notice that you use pin 22 to power the Y511 (line 145) where I have ‘-1’.  I also don’t see the line ‘<span class=”crayon-i”>AltSoftSerial</span> <span cla…[Read more]

I am having problems with the interference between MODBUS and SDI12 sensors on a Mayfly v0.5 board.  I can remove either one and the other works perfectly, but together I end up with around 20% -9999 values, usually for the SDI12 CTD.  I am virtually certain this has to do with the home-made modbus wing that I have built for this system.  I…[Read more]

I would only need 5 at this stage.  I would connect it to my Yosemitech turbidity sensors and potentially Yosemitech pH sensors as well.

Regards,

James

Appreciate the hard work.

James

Do you have any idea when the RS-485 half shields are likely to be in stock?

James

I’m interested in using these mDot modules to connect with the Helium network.

Dale or Anthony, would you mind posting your code to integrate mDot modules with the Mayfly?

Thanks for your help!

Regards,

James

 
<h2 class=”user-nicename”></h2>

I will give this a crack.

Regards,

James

@neilh20, yes all setups are the same.  Some work fine, others have issues with dropping out.  I have spare Mayflies and a spare CTD, but no spare turbidity sensor.  Did you ever end up producing your Mayfly wings for the 0.5…[Read more]

Regards,

James

I’m leaning more towards an interaction with the MODBUS wing.  I had one station that produced -9999’s constantly when the Turbidity sensor was plugged in, and operated fine when I removed the MODBUS wing.  This drove me nuts until Anthony pointed me towards the complex loop code where I set the Turbidity sensor to low a…[Read more]

Around 50% of my sites have a problem where the CTD drops out on a regular (not predictable) basis.  This results in -9999 values which may persist for a few readings before returning to normal.

I still get a data record out of this, but the resolution is lower and I would like to fix it if possible.

Has anyone experienced this…[Read more]

modem.modemWake();

It’s now logging to MMW.  Please let me know if this is fundamentally wrong or will cause problems in the future.

James

I have followed your advice and I think this is working, i.e., I am no longer having problems with -9999 values for the CTD.

However, the complex loop code is preventing publication of data to MMW.  I’m sure this is something simple, but I can’t seem to figure it out.

I have tracked the issue to the line where the code checks…[Read more]

Is there any way to edit the data record for a site on MMW?  I have had some problems with one site and would like to delete a section of the data record that is erroneous.  I can’t seem to find an option to do this anywhere?

Regards,

James

Have a great Christmas and New Year.

James

I have a frustrating problem at one of my sites where the turbidity sensor seems to be interfering with CTD readings resulting in -9999 readings for all CTD measurements.  I’m using a DIY MODBUS shield for the turbidity sensor, and when I remove that the CTD reads perfectly.  This puts me in a situation of only being able to read the C…[Read more]

Also TSA only seems to show battery voltage and Mayfly board temperature.

James

James

I have just installed six sites which seem to be calling in reasonably reliably.  The data is showing for each measurement but only EnviroDIY sensors are show a sparkline and are able to be examined in TSA.  I can download a dataset from each site and analyse it in excel but would like for the community to be able to see data in TSA.

I n…[Read more]

I recently presented at the INTECOL Wetlands/Freshwater Science conference on an IoT Sensor Network I’m looking to develop using Mayflies.  Here’s a link to the presentation which might be of interest to some of you:

https://youtu.be/NXgccSbwIVU

Happy to answer any questions.

Kind Regards,

James

My workplace is purchasing a new TriOS Opus nitrate sensor, and I’m wondering if I could get this working with the Mayfly.

https://www.hydrotechzs.com/downloads/opus-manual.pdf

It communicates via MODBUS RS-485, so I figure my DIY modbus wing should be able to facilitate communication.  However, I don’t really know where to begin after…[Read more]

I contacted the NZ branch of SApply and they have around 40 in stock, but that’s it for a while.  It sounds like it’s related to the issues that are plaguing the semiconductor supply chain at the moment.

James

It seems that there is now a global shortage on XBee-3 LTE’s.  Does anyone know anywhere that has them in stock?

I contacted DIGI and they claimed a lead time of 52 weeks.

James

Im just wondering if anyone has considered using the Helium network with the Mayfly? Essentially it’s a LoRaWAN network where the infrastructure is owned by the public. They are incentivising network expansion by rewarding hotspot owners with HNT, their own cryptocurrency.

Im interested because there is potential to establish a local H…[Read more]

James

My code is b…[Read more]

Yes I am on D7 for the CTD. I am using the default pins for the mayfly modbus wing (https://github.com/EnviroDIY/Mayfly-Modbus-Wing/tree/master/Modbus-Mayfly_WingShield):

Communication is hardwired to Mayfly digital pins 5 & 6, which enable use of the AltSoftSerial library.
Read more at our Notes on Arduino Streams and Software…

[Read more]

I am testing a Mayfly setup with a HYDROS 21 CTD and a Yosemitech 511-A turbidity sensor. The Turbidity sensor is working well, but the CTD seems to intermittently dropping in and out (see attached MMW plots).

Any thoughts on what might cause this? I have set the CTD address to channel 1 as per instructions. I did notice that the…[Read more]

This is an old thread but I have recently purchased ten Y511-A sensors from Yosemitech.

My contact is called Zoe “sunxian@yosemitech.com”.

HTH

James

James

James

That’s really good news.  Yes I was reading through some historical issues on git-hub about problems with the Polou step-up module and inability to set brush intervals. My 511-A seems to be functioning well so I’m assuming the Polou step-up issue is also solved.

One quick question, In your view, is the 511-A worth the extra…[Read more]

I am going the the process of building 10 x modbus wings for Yosemitech sensors. Most people are probably aware of the lack of quality control on these adapters, so I would like to test them before I solder them to the wing. What is the best way to test one of these without soldering to the wing headers? I tried just sliding one over…[Read more]

I’m pretty sure our methods align to that of USGS. However my concern is that the cross-sectional area will change with every large flow event due to the mobile bottom sediments, giving us a poor relationship between depth and flow. Our hydrology team has suggested that an accurate rating curve is very difficult to obtain in such…[Read more]

James

I think I will have to look for fixed structures, i…[Read more]