Shannon Hicks

Have you tried disconnecting one sensor at a time and seeing how the other one performs?  We’ve found that sometimes when one sensors fails or “goes bad”, it can cause erratic readings or performance of any other sensor that’s also connected.  By unplugging each sensor independently, it’s usually easy to isolate which sensor was the actual c…[Read more]

Is it a Mayfly 1.1 revB board?  or a revA?  That station seems to not have the usual 4.3v during the day that most v1.1revB boards get, and is more similar to the voltage one sees on a v1.0 or v1.1revA board.  What solar panel do you have on that station, and is it in a very shady location, or is the panel pointed north?

All that being said, di…[Read more]

-9999  is not an actual reading from the sensor, it’s what the Mayfly stores as the value when it doesn’t actually get a valid number from the sensor.  You’d see the same thing is no sensor was attached to the Mayfly at all.  What is the MMW station name or URL?

Questions about implementing new hardware configuration or adding new sensors are best asked here on the EnviroDIY forum in the appropriate category.  While I’m the designer of the Mayfly Logger board, there are plenty of other knowledgeable people in this community who can also help answer questions.

We’ve published some sample power usage readings over the years, but it varies by station configuration and board version and a few other settings.  But in general, a Mayfly v1.1 revB board with an EnviroDIY sim7080 LTEbee will use about 8 mA at idle, 0.650 mA in sleep mode, and a max of 110 mA for a few seconds when actively transmitting.  But y…[Read more]

We’ve published some sample power usage readings over the years, but it varies by station configuration and board version and a few other settings.  But in general, a Mayfly v1.1 revB board with an EnviroDIY sim7080 LTEbee will use about 8 mA at idle, 0.650 mA in sleep mode, and a max of 110 mA for a few seconds when actively transmitting.  But y…[Read more]

Your questions are all very subjective to a variety of operating conditions, so I can only give you some broad estimates of what we’ve experienced with the 300+ stations we’ve installed and maintained.

We typically put a 4400mah Lipo battery on the Mayfly boards because on standard logger configuration, they can be charged fully by a 3.5w or 5w…[Read more]

You’re right, you correctly have your sensor’s signal white wire connected to the Grove cable white wire, which goes to the AA1 pin of the Aux Analog grove jack, so you can disregard my suggestion to change the ADS1115 code to adc0, and just leave those two lines as they were, using adc1.

You’d have to check with Meter Group to find out what the sensor communication protocol is.  There’s nothing on their website to indicate what sort of output it has.

If you’re able to swap out a Hydros21 manufactured in 2022 with your hardware and everything works fine, but sensors from 2023 aren’t working, then it’s possible that they’ve made another design change that requires some tweaking of the ModularSensors code library to make them work correctly.  We’ve had a report of one other person having trouble…[Read more]

First you should attach the sensor’s clear wire to the GND pin of the screw terminal board along with the black wire.

Second, the sensor needs at least 5 volts of excitation power, and the jumper setting of the Aux Analog Grove jacks in your photo is set to the default 3v position.  You need to move that jumper to the 5v position.  See the s…[Read more]

Does the sensor have bare wires or a 3.5mm stereo plug?  Either way, ensure that the sensor is connected properly to the Mayfly with the sensor power wire going to a 3.3v or 5v constantly powered pin during the address changing sketch.  And make sure that the data wire of the sensor is connected to the proper Mayfly pin, which is usually D7 in t…[Read more]

Yes, they were all bought shortly after re-listing.  I’ll be working to build more as soon as I can.

If you’re keeping the Switched Power Out LED on all the time, then that is also powering the Aux 3v regulator, the 5v boost regulator, and the 12v boost regulator, as well as the LED.  I haven’t measured the current draw of all of those things while the board is sleeping, but it is most certainly the reason your battery drains so quickly.  You c…[Read more]

How are all your Atlas sensors connected to the Mayfly?  Through the I2C grove port?

Your github repo isn’t public so I’m not able to view it.  I’d have to see the sketch to understand what’s going on with the logger code, but I’m guessing there’s a variety of factors involved in the failure.  One is that it looks like your station uses way too much power overnight, so either it’s not sleeping properly or you’ve got some LEDs on o…[Read more]

SDI-12 sensors usually use 12 volts for sensor excitation because that’s what the specification for the protocol dictates.  Fun fact:  the “12” part of “SDI-12” does not refer to the voltage, but rather the baud rate, so the name actually means “serial-digital interface at 1200 baud”).  Back in the days when the protocol was first being used, mo…[Read more]

There’s one 3.3v regulator that’s always powered on the Mayfly (anytime the Mayfly power switch is ON, even if the processor is put to sleep), and that can be found along the top (inward end) of each of the 20-pin headers, helpfully next to the GND pin you’d also need for sending power to an external device.  The three switched power options…[Read more]

We sold the last couple kits last week and I hadn’t updated the status page yet to indicate that, but I just did.  There were some supply issues with some of the parts in the starter kits and full station kits, but that should be resolved soon and the kits back in stock in about a week.  The rest of the custom EnviroDIY electronic items like the b…[Read more]

As long as you’re using the latest Hydros21 library file that has the longer sample time (500ms warmup and 1000ms sample time, as shown here:  https://github.com/EnviroDIY/ModularSensors/blob/master/src/sensors/MeterHydros21.h) then it sounds like maybe a faulty sensor.  Or it could be that the Mayfly isn’t waiting long enough to either warm up o…[Read more]