Shannon Hicks

There’s nothing electrically wrong with having all 4 resistors populated on that board, but only one pair will be used for your sensor analog input, and the other pair will not be connected to anything and will therefore not be performing any function.

If you only have one C-FLUOR sensor, then you only need one pair of resistors, since there’s only one analog signal from the sensor.  There ARE two ground wires, which is why I asked how many sensors you were using with this one screw terminal board.  In order to connect two Turner analog sensors to a Mayfly Logger, it’s good to use 2 separate s…[Read more]

If your station is in an open location that gets several hours of direct sunlight every day, then a 2W panel is probably sufficient if you have a cellular modem on your station.  The 2W panel is definitely sufficient if it’s just a Hyrdos21 sensor and no telemetry.  But if your station is under tree canopy or is mostly shaded, the P105 model 5W p…[Read more]

Are you trying to measure 2 analog signals from 2 separate sensors with just one 6-pin screw terminal board?

That happens occasionally when the connection between the Mayfly and the online time server gets terminated before the entire timestamp gets transmitted, resulting in an incomplete timestamp, and the Mayfly code has some smarts to check whether the timestamp it received is a valid, reasonable date.  If you ever get this error, you can just…[Read more]

Mayfly v1.0RevA had a Max17250 boost chip that used the following resistors in order to set the output voltage at 12 volts:

R15 = 10k
R19 = 84.5k
R31 = 220k

When it was time to manufacture more boards in 2021, there was a semiconductor shortage that made it impossible to find that particular boot converter, so the design was modified to use a…[Read more]

In 2021, there was one small production run of the Mayfly v1.1 RevA boards that, due to an error by the manufacturer, used an incorrect resistor value for the 12-volt boost circuit, resulting in a lower output voltage, around 11.3v.  This was corrected in the next manufacturing run, along with making a few other changes, which is why the v1.1…[Read more]

There’s a section in the User Manual that should have been included in the shipment with your sensor (it’s also downloadable from here: https://metergroup.com/products/teros-12/teros-12-support/) that explains how to use the raw number collected by the sensor to calculate soil moisture content.

It looks like you’re having the same issues a few other people have reported lately. We’re working on a fix, but in the meantime, the easiest thing to do is to replace all your “MyDocuments/Arduino/libraries” files with the stable versions from last summer.  In order to do this, you’ll have to delete all the current library files on your PC.  If y…[Read more]

That means your IDE’s Serial Monitor baud rate is not the same as the baud rate in your sketch

Did you make sure the sensor is properly wired to your Mega, (tip to 5v, sleeve to GND, and ring to data) and that the pin number in the sketch matches whatever pin number you connected the data line to?  If all the wiring is correct, then it might be an issue with the latest SDI12 library that a few people have reported.  You could try r…[Read more]

The baud rate in the example sketches is usually 57600 or 115200, which is the rate for the Arduino board’s serial output port that it uses to communicate with your computer, not the sensor.  For whatever rate you choose, you have to manually change your IDE’s baud rate to match, otherwise you’ll just get gibberish on the monitor.  The baud rate o…[Read more]

I’ve attached a screenshot from Meter Group’s Teros 12 Integrator Guide.  It shows the wiring scheme for the bare-wire version and the 3.5mm stereo plug version.  If you’ve got the sensor with the 3.5mm plug, then you’ll need to compare this diagram to whatever breakout board you’re using to match the tip, ring, and sleeve to the power, ground, a…[Read more]

How many sensors are you wanting to connect to your Arduino board?  Do you have a Mega, or Nano, or both?  What sort of termination is on the end of your sensors?  Are you just wanting to display instantaneous sensor data on your computer or are you trying to build a logging device?

Thanks for the update.  We’re looking into it, my guess is there’s a conflict between two libraries that is causing some issues, so we’ll have to dig into it and narrow it down.

There’s information on this page, in Section 6.2 about the holes for the cable glands: https://www.envirodiy.org/knowledge-base/building-an-envirodiy-monitoring-station/

As mentioned on that page, the 1/2″ NPT cable glands require you to drill a 23/32” hole and tap it with a 1/2″ NPT tap.  I don’t know what the diameter of the cable for your sens…[Read more]

That’s one of the older, now-discontinued Xbee models.  Have you used that module before or is it completely new and unused?  We had many of them die after about a year of service.  Did you modify the SJ19 solder jumper on the back of the Mayfly to change the bee status pin from the usual Bee pin 12 to Bee pin 13.  I see you have it listed cor…[Read more]

What modem are you using with this setup?

Can you email me at mayfly@envirodiy.org, I have a few other questions about the software libraries and hardware combinations for your setup.

Do you happen to have a spare Mayfly board, or any other Arduino-type board that you could run the sketch on?