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The sensor was getting 12V power. Every time I give SDI12 commands that wipes and measure the turbidity, the command would run (as evidence by wiper run) but it wouldn’t get any sdi12 command response. So, I used CR350 to change address from 0 to 1 and now it’s working correctly.

I’m not sure what you mean by “The page says 12V is the default” because the default Grove jack jumper setting of the Mayfly v1.1 boards has always been 3.3v.  You have to manually move a jumper if you want to select 5v or 12v for the Grove jacks on the Mayfly v1.1 board.  So verify that the jumper next to the Grove jack you’re using for the s…[Read more]

The page says 12V is the default and my sensor is getting 12V because I could send command to run wiper which needs 12V and it works. But data measurement command doesn’t work.

There are instructions on the Grove jack jumper settings on this page, including a photo showing examples of what the jumper position would look like for the different options:  https://www.envirodiy.org/mayfly/hardware/jumper-settings/

I am using Mayfly v1.1. The turbidity sensor is connected with Screw Terminal.
I downloaded the zip from EnviroDIY_SDI12 using https://github.com/EnviroDIY/Arduino-SDI-12/archive/master.zip.
I am able to run the wiper with these:

Serial.println("Sending 0M2!");
mySDI12.sendCommand("0M2!");
delay(1000);

Using this inside loop that runs every 30…[Read more]

What is the board version of the Mayfly data logger board that you’re using?  Did you set the jumper header next to the Grove jack to the 12v jumper setting?  Are you using the latest version of the EnviroDIY_SDI12 library?

I’d suggest trying a product called Goo Gone.  It’s a citrus-based adhesive/sap remover that is safe for use on plastic.  DO NOT use Goof Off, it isn’t safe for plastics and will damage the solar panel.  Rub a little Goo Gone on the sap and let it sit for a few minutes, then wipe it off and rinse it off with some soap and water.  It might take a c…[Read more]

Awesome! I will work on a set post.

<p class=”isSelectedEnd”>Yes, absolutely—we’d love for you to share it! One of the best things about the EnviroDIY community is seeing the creative ways people adapt the Mayfly and develop new hardware and software solutions for their monitoring needs.</p>
<p class=”isSelectedEnd”>A post describing your LoRa implementation would be very hel…[Read more]

For data you have on the SD card, you can upload it so that it appears online following these instructions: https://wikiwatershed.org/wp-content/uploads/monitor-my-watershed-quick-guide-uploading-data.pdf.  NOTE: The instructions mention that there’s a file size limitation.  That limitation no longer exists.

Sadly, though, if your data isn’t on t…[Read more]

The shield wire of the OBS3 sensor cable doesn’t actually connect to anything on the sensor, so it’s okay to leave that floating, especially if you’re just testing the sensor.  The green and black wires both definitely need to be connected to GND or the sensor won’t work properly.  Both the high range and low range should read around 0 NTU when t…[Read more]

Thank you for the information. I will try the voltmeter for confirmation.

Can a 7-year-old OBS3+ turb sensor go bad if it has been sitting in a climate-controlled room? It was probably used only a couple of times for testing indoors but has been powered off for at least 6 years. I get a positive reading when exposed in the open air, but when I…[Read more]

It’s possible to use a battery that big, as long as the polarization of the JST connector is the same.  However, we rarely have the need for a large battery with our standard stations with sensors like CTD, turbidity, or oxygen, even with cellular telemetry ever 5 minutes.  If you use a really large battery, you have to make sure your solar p…[Read more]

Those old Campbell OBS3+ turbidity sensors will either flatline or go negative when they fail.  We started deploying dozens of that sensor model about 8 or 9 years ago and almost all of them have been removed from the field in the past few years due to failure.  It looks like your station is 8 years old so you got more life out of it than m…[Read more]