[hank]

I know folks have gone the “cheaper” route with atlas sensors (https://www.atlas-scientific.com/ph.html) but i’ve worked more with Hach environmental/YSI as more field water quality industry standard. I also check In Situ (multi-sensor platforms) or Fondriest (distributor of various sensor vendors) every now and then.

As far as I know, pH probes are still prone to a lot of calibration drift, so i’d check calibrations before going out to the field and be careful with glass electrode systems (fragility).

Post-fire, i would anticipate changes almost all major water quality parameters to change: specific conductance (similar vendors as mentioned previously), turbidity from loose sediment delivery, biochemical properties (carbon, nitrogen, phosphorous), etc. Time-wise, i’d anticipate one short pulse close in time of fire event from near shore charred sediment, gradual pulse from atmospheric deposition shortly after fire, and short pulses following from any subsequent rain events- note, mostly educated guesses here in time-series stuff. ‘Luck and be safe! -h

[hank]

in your main loop function, somewhere in lines 44-47 you need to call:

logData(dataRec);

[hank]

Hey Thomas,

– No, I haven’t seen optical DO probes less than 350, but I’ve only used PME minidots (onboard logger and should fit under a dome; ~1k) and Hach Hydrolabs (multiparamater sondes that are likely too big for domes; several K). Electrochemical/Clark-cell DO probes may be another option (calibration will drift more). If you only need a few days for chamber estimates (benthic productivity?), the calibration of electrochemical probe may be good enough.

– For the arduino systems, typically I have a separate voltage regulator for the sensor than the board. Note, this preference may be lack of arduino board use however.

henry

[hank]

yeah, the library is for sdi12 sensors.

[hank]

Somewhere on the site, it recommended a Sodaq DS3231 library, which is similar to the Mayfly. Make sure the coin battery is in.

I used the example to set the clock (took me ~10 sec to upload): https://github.com/SodaqMoja/Sodaq_DS3231/blob/master/examples/adjust/adjust.pde

Then before powering down, I upload the code for data-logging. If you power down and then re-power without uploading new code, it will reset the time for what you had adjusted from the above example.

Attached is my data-logging/xbee transparent (AT) communication code. It writes a csv string with time stamps then sensor data- weather station in my case via composite SDI-12 command. The FormatTS function just adds leading zeroes when needed. Sorry it’s in text format, the forum didn’t let me attach a .ino file.

There might be other RTC libraries, but i went with the safe route. -h

Attachments:

1. sdi_weather_sleep_hp01.txt

[hank]

Way late response. Was checking the forum about any issues from batch v3.0.

From pricier logger/DAQ setups, i’ve seen Raven cell modems from Sierra Wireless (with NexSens data loggers and NI cRio data acquisition the Raven modems). Not sure if folks have combined the modems with any Arduino boards.

Board-wise, I know of the FONA board from Adafruit: https://www.adafruit.com/products/3147
I also ran across Skywire (distributed through digikey): http://www.digikey.com/en/product-highlight/n/nimbelink/skywire-lte-cat1-modem

Note, no experience using either breakout boards.

If my XBee radios + Mayfly can’t punch through the elevation gradient and slight tree interference, I may end up going with a Campbell CR300 logger + Raven Modem (assuming boss has the cash). Not sure if I was of much help, ‘luck with your project! -h

[hank]

Thanks. A colleague, who’s more pro at soldering, got a bit on the pad. RTC kept the time in an overnight off state.

I tried to apply some solder on the negative battery terminal, but couldn’t get and to stick (probably due to some plating).

Anyways, onto figuring out sleep modes and xbee data pushing hehe. Thanks again! -h

[hank]

Yep, it read 0V on the backside pins. Only 1 Mayfly to test with, (another on its way). I’ll look into batteries. I just passed by the Batteries Plus store for the CR1220.

I believe it’s Nuon brand, but has a “textured” backside: https://www.batteriesplus.com/battery/lithium/1220?q=cr1220

I’ll swing by the BestBuy or look for the Energizer brand on Amazon. Thanks again! -h

[hank]

Attached. Thanks again for taking your time. Sorry for the time sink. -h

Attachments:

1. 

   mayfly_front_50_hp01.png
   

2. 

   mayfly_back_50_hp01.png
   

[hank]

Thanks for the timely replies!

Mine read out zero with positive on the battery housing and ground on the microSD. Pic hopefully attached. (Board in off state and not plugged via USB). Note, i did also change a jumper on one of the Grove connectors to 5V, no sensor/cables attached.

The battery itself is 3V outside of housing. -h

Attachments:

1. 

   mayfly_rtc_batt_test_hp01.png
   

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