[mbullard]

Thank you for the quick response, we are looking forward to the new modbus adater.  Meanwhile, we made some quick changes to  existing wingboards to power the Y-511A from the 12v available on the V1.1 rev B, with good results.   One station is back to normal and the other should be as soon as the updated wingboard is installed.  Thanks!

Edit 12/22/23:  The change to the wingboards did not resolve the issue, but did change the data the Y511-a was sending from -9999 to 0.0

Edit 2/9/24:  Turns out the wiper on the Y-511A was rotating outside of its normal operation and got stuck on an adjacent PVC fixture.  If the wiper rotates 360 degrees instead of just wiping back and forth, the rubber wiper will overhang the stainless steel body of the Y-511A, and collide with other things.   The stuck wiper was pulling a lot of current, and possibly causing voltage sag on the Mayfly.  Unstuck now, and appears to be operating normally.

[mbullard]

(I am placing this comment here rather than start a new topic because of similarities)

We have two stations that developed the same problem in August of 2023. One station is here:  https://monitormywatershed.org/sites/GVWA%20107/

Both were V1.0 Mayfly with the LTE Bee, Hydros21 CTD and Yosemitech 511-a Turbidity sensors with the Modbus-Mafly-Wingshield .  The Hydros21 is using the new 500 and 1000 ms timings and the voltage jumper is set to 3.3 volts.  The wingshield is getting 5 volts switched from the header (pin 11) and using the U3V12F9 boost regulator.

First symptoms in August were the CTD returning -9999 and -9991, which are bad measurement and low voltage error codes.

We replaced the V1.0 boards with V1.1 rev B boards this week but the problems persists.   However, disconnecting one or the other of the sensors results in normal operation for the connected sensor.  Is it likely that there is insufficient power getting to the sensors during sensor operation? If so, could I try:

• getting 12 volt for the 511-a from pin 9 on the header (now that the 12 volt boost has been upgraded) and removing the U3V12F9?
• the above, but also altering SJ25 to get 9 volts?
• change SJ27 and monitor for voltage sag?

It is always possible to run a jumper from the LIPO header to a second board as a workaround.

Thanks for any insights,

Mike

 

[mbullard]

Shannon, thank you.  I will keep it at 500 mA, while increasing the solar panel wattage to provide more hours of charging at 500 mA.

[mbullard]

Hi,

What is the maximum recommended amps from a 6 volt solar panel to the V 1.1 board?  Is this different for previous boards?  There are two solar inputs–are these the same input but different connectors?

Thanks

EDIT:  I see the data sheet for the BQ2407x charger but don’t understand it.  Is the input current from the solar panel limited by the BQ24074?  Also I see on the board diagram that the two solar inputs are the same.

[mbullard]

Here are some more.

Modeling Spatial and Temporal Variation In Natural Background Specific Conductivity.  https://cfpub.epa.gov/si/si_public_file_download.cfm?p_download_id=540509&Lab=CEMM

Effects Of Land Cover And Geology On Stream Chemistry In Watersheds Of Chesapeake Bay 1https://repository.si.edu/bitstream/handle/10088/135/LiuSpotJAWRA2000.pdf

Factors controlling the major ion chemistry of streams in the Blue Ridge and Valley and Ridge physiographic provinces of Virginia and Maryland.   Paywall.  https://onlinelibrary.wiley.com/doi/abs/10.1002/hyp.3360060108

Characterization of Major-Ion Chemistry and Nutrients in Headwater Streams Along the Appalachian National Scenic Trail and Within Adjacent Watersheds, Maine to Georgia.   fig. 16  pg. 52 https://pubs.usgs.gov/sir/2011/5151/pdf/sir2011-5151-508.pdf

 

[mbullard]

James,

Could you solder the jumper on the old version wing board that would otherwise be under the step up board?  And get 12 volt from the new Mayfly?   I am not qualified to make any recommendations, but since 12 volt is on the new Mayfly, you should be able to power the Y511 that way.

Mike

 

Mike

[mbullard]

Thanks!

[mbullard]

Hi Shannon,

Is there a topic describing changes from Mayfly V1.0 to V1.1?  If not, can you describe?

Thanks,

Mike

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