Shannon Hicks

The Bee socket of the Mayfly board isn’t powered continuously by default, so in your code examples above, it appears that you’re not turning them on.  If you study the schematic for whichever hardware version of the Mayfly you have, you’ll see that you either have to activate the power to the bee socket’s regulator by setting Mayfly pin D18 high…[Read more]

The ADC example I linked above from Sparkfun applies only to the onboard 10-bit ADC of the ATmega1284 processor.  For the ADS1115 auxiliary ADC on the Mayfly board, the formula on the Sparkfun page does not apply, because the ADS1115 is a dedicated ADC chip and works differently.  The operational specs of the chip are outlined in the TI d…[Read more]

The calculation for the conversion of analog bits to voltage depends on the operational voltage of the system (3.3v in our case) and the resolution of the ADC.  You can see an example calculation (and more importantly, the formula used) for a 10-bit Arduino here:  https://learn.sparkfun.com/tutorials/analog-to-digital-conversion/all

The ATmega1284P processor of the Mayfly is similar to other basic Arduino boards with the 324P processor in that it has an internal 10-bit Analog-to-Digital converter (ADC).  There are 8 ADC pins on the 1284P, so these pins can be used to read analog voltages, however at a pretty coarse resolution (1024 bits over the 3.3v sample range).  But t…[Read more]

There’s nothing to unsolder.  Solder Jumper SJ25 has 2 small pads.  By default, they are separated and not connected at all, and that makes the on-board boost circuitry output 12 volts.  By putting a solder blob on SJ25 and connecting the 2 pads, you add some extra resistance to the circuitry that controls the voltage and it’ll output 9 volts in…[Read more]

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?