Shannon Hicks

Here’s my code that has been successfully working on a Mayfly v1.1 RevB board, with a Hydros21 connected to the D4-7 Grove jack (with jumper set to the switched 3v setting) and a Y-511a and our custom RS485 adapter connected to the D5-6 jack and an external (non-Mayfly) 12v source supplying power for the Y-511a.

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When we scout an area for a potential CTD sensor installation, one of the top deciding factors is whether that portion of the stream will freeze during extremely cold weather.  Almost all of our sensors are mounted in deep, continuously flowing water.   Most of the time our streams won’t freeze at all in the area around the sensor, or if they do…[Read more]

If you have the original sketch that someone wrote for the logger, then that should give you clues of how everything should be connected.  There are several different ways in which to connect a tipping bucket to a Mayfly logger, some require a circuit in between to do the actual counting (like the Trinket or an ATtiny), but we’ve had good luck…[Read more]

We’ve been using Y-511a sensors together with Gen 2 Hydros21 CTD sensors and have had no problems with communication, however we’re using our own modbus adapter (based on a MAX13412 chip) instead of the Neil’s modbus wing.  As Sara said, the sensors shouldn’t be talking the the Mayfly at the same time since the Y-511 has a 40-second warmup time,…[Read more]

Thanks for the heads up, I just updated the availability page.  We shipped more boards to Amazon before the holidays, but they haven’t restocked them yet.  Hopefully they’ll be back in stock and available soon, but in the meantime, they’re still available in 5-packs in the EnviroDIY Shop.

It sounds like you’ve got one of the older Digi LTE cell boards?  We retired most of ours in 2020 because they failed after a year or two of operation, which is why we developed our own LTEbee module based on the SIM7080.  What does the data on you microSD card say the signal strength and battery voltage is since the station went offline?

The Mayfly v1.1RevB board uses a 6-pin Tag-Connect socket for the ICSP header:  https://www.tag-connect.com/product-category/products/cables/6-pin-target

Previous versions of the Mayfly boards used standard header pins for the ICSP header, (0.5″ spacing on v1.0 and v1.1RevA, and 0.1″ spacing on v0.5 and older).

The Y511-A has a wiper motor that draws a little too much power on initial startup, so unfortunately even the newest Mayfly 1.1RevB still can’t power it directly.  Our early 1.0 prototypes handled all the various 12v sensors just fine, but the voltage regulators on that prototype have been out of stock for the past 18 months, and we’ve been…[Read more]

With the Y511-A sensors we have (that were purchased about a year ago), whenever you apply 12v to the power wire, the wiper spins continuously in one direction for 5 full revolutions and then “parks” the wiper blade in the home position.  Then it pauses for a few seconds, then it performs the actual back-and-forth cleaning wipe motion (not full…[Read more]

No, the only official way to buy a single Mayfly is through our listing in Amazon, while 5-packs can be purchased through the Shop on this website.

It should work fine, assuming you’ve wired the device to the Mayfly properly (did you connect the Ground of the Mayfly to the Ground of the modem?)  What is the operating voltage and communication voltage of the modem?  The mega2560 is a 5V board, while the Mayfly is a 3.3v board.

Sorry I didn’t catch this earlier when I looked at your code.  But in line 39, you included the wrong library.  All of the various Mayfly board versions we’ve ever built have the ADS1115 chip on them, so you need to specify the ADS1115 library and no the ADS1015 library (because the 1015 is the lower-resolution version of the chip).  So line 39 if…[Read more]

I think you might be mistaking the monthly fee with the initial $20 auto-pay amount they charge to maintain a positive balance in your prepaid account.  The typical plan we recommend is the Maker Flexible plan, which is $0.60 per month (whether you use the card or not) and then $0.40 per MB of actual data usage.  Most of our loggers (when t…[Read more]

Which hardware version of the Mayfly board are you using this sketch on?

As long as the cards are formatted for FAT32 and you can read/write to them with other Mayfly boards or Windows devices, then it’s possible the on-board memory card socket on that Mayfly is broken.  Is this a brand new board that you’re using a card in for the first time?  If you’ve got an EnviroDIY vertical microSD adapter you could try putting t…[Read more]

I use pin 22 on line 145 because I’m using a prototype Mayfly board that is able to generate 12v to directly power the external sensors. If you’re using an external 12v source for your sensors, then it’s fine to put -1 on line 145.  And I’m using a Max13412 RS-485 chip on my modbus adapter, which has auto direction control and internal 5v…[Read more]

I looked at your sketch, it’s based on some really old examples we published many years ago at the beginning of the Mayfly project, but it should still work if you’ve got all the original old libraries.  Many of them have been replaced or updated since then, and major changes were made to the Mayfly board design in recent years, making some of…[Read more]

Thanks for posting your code, I edited your post to put it into the “code formatting” window that you can use when pasting code into our forum.  It’s the little unlabled icon that looks like this:  “<>” in the toolbar above the text entry box.

Your issue is caused by an error on line 186.  It should look like this:

new Ca…

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When you power up the ClariVUE10 sensor, we’ve found that it take a few seconds to warm up before the Mayfly can “see” it.  So when that sketch cycles through all of the available numbers and letters, it usually doesn’t see the ClariVUE until the second loop through.

So when you first connect the sensor from the factory and run the sketch, it’ll…[Read more]

For the past year we’ve had 8 stations using SDI12 CTD sensors and Yosemitech wipered turbidity sensors together on one prototype Mayfly using the EnviroDIY RS-485 half-shield.  It also works with other generic modbus adapters too. We’ve had no issues with not being able to read the sensors or with dropped readings. I’m attaching the code below…[Read more]