neilh20

Hi @khaase I haven’t figured out what the source of the reset is, as the AVR1284 Arduino code discards it – very frustrating.

I have used low ESR capacitors – something like Digikey 732-9079-1-ND CAP ALUM 680UF 20% 10V THRU HOLE LOW ESR

Whenever I have longer wires, a power switch, or current measurement, with the LiIon battery, I get some…[Read more]

Maybe of interest https://www.envirodiy.org/topic/primary-powering-in-cold-settings/

@davem great topic.  I was at a SSU Eng Presentation yesterday by Enphase   a leading solar equipment provider and they use LiPo4 in their battery 3.3Kwh/10Kwh systems.  All about safety.  LiPo4 slightly less power density — but that isn’t a problem with stationary systems.  No temperature stability. Fire issues are a big deal. A recent newsp…[Read more]

Hello Dave, thanks for sharing.

I had thought of getting the device, because of the price, so interesting.

The issues I saw is that it has two sources of analog error and unquantified temperature coeffocient  for each source of error.

Every “analog” device typically has a temperature dependency, This would be the depth sensor itself, which…[Read more]

Hi James, if you have the spare jumper cable sockets you could try it and it probably will work.

The challenge is the Mayfly doesn’t have a lot of capacitive buffering and the LiIon battery performs that function.  It might be more reliable to have a battery on each Mayfly and run the solar panel to both.  Of course the boards need to be kept p…[Read more]

Wow thanks so much for sharing, and no problem with your English.  I’ve been in that situation where its difficult to debug ModularSensors/Mayfly as the software implementation using time loops is so time sensitive.

Are you planning on using a git to store the programs with an open source license? Its very nice if you do and gives some…[Read more]

@rogers1313 – its a good “engineering question”. speaking as an electrical engineer and some one that has blogged on understanding traceability,  measurement range, measurement resolution. measurement accuracy and  total error band of measurement being different aspects of the  measurement.

In short the Hydro 21 has calibrated measurements th…[Read more]

Some other links .. I’m trying four links to see if it passes the spam filter ..
https://github.com/neilh10/ModularSensors/wiki

https://github.com/neilh10/ms_releases/wiki
https://github.com/neilh10/ms_releases

https://github.com/neilh10/ms_hardware

@rogers1313 great to hear of your project from the technical questions thread.
This thread on scaling may be of interest.
I just posted a lot of links for scaling systems, and I forgot that enviroDIY doesn’t allow too many links in messages. (spam protection I guess).
I’m scaling some systems for Tu N California, soley stage gauges at…[Read more]

@rogers1313 my systems only have the Yellow led ON when actually charging. If the battery is charged, not charginng then it is OFF. The description in “Section S”, beneath the pics https://www.envirodiy.org/mayfly/hardware/details-and-specs/ says

A yellow LED (labeled CHARGE) will light anytime the battery is being charged. Once a battery is…

[Read more]

For the battery, seems to me there is two engineering approaches, specification and characterization.
For the specified battery 4400mAh https://www.adafruit.com/product/354
which has a listed data sheet from the manufacturer – https://cdn-shop.adafruit.com/product-files/354/C449_-_ICR18650_4400mAh_3.7V_with_PCM_20140728_APPROVED_8.18.pdf
it has a…[Read more]

@mbarney, thanks for the settings.   What was the sim supplier that you used – a Verizon direct, or an MNVO like REVX.

I did get an email earlier this week from SimCom that there 7080G was now certified by Verizon, so good to know it works 🙂

<h2 class=”user-nicename”>@mbarney</h2>
@mbarney on Mayfly 1.1 I connect SJ17  – that enables the Blue Network Status LED, and indicates the progress of the LTE-CATME connection.   Off – no power,   ( I think)  ON – attempting connection,   FLASHING – connecting

For Mayfly1.1 I also

Solder SJ15  – assumes 4400mA hr battery, and allows 1A charg…[Read more]

I’ve released an expanded Modbus/RS485 Wingboard for community design review

https://github.com/EnviroDIY/Mayfly-Modbus-Wing/tree/master/knh002-MayflyWingShield/rev8

I’d welcome design comments,  on https://github.com/EnviroDIY/Mayfly-Modbus-Wing/issues/3 by Monday 2022-July-20 12noon PST.   Easier to correct any possible problems early on, th…[Read more]

Hello Erik, hmm perhaps I’m coming from too many years of reading code,

Yes the order matters for the code, that the instance follows the the constructor.

What you are looking at I think is  “// .. sensor” , and that  is a comment

It does look like it may have been swopped, but its only descriptive text.  Getting descriptions to match the co…[Read more]

Hello Erik, I’m sorry I still don’t understand your question.

Hello Erik, sounds like you are on the path to learning Cpp.  One issue to keep in mind is that the code is what happens, the reality check, the documentation is for readability.  You may want to be list what gas sensor you are looking at for the max help.

So I don’t follow your question  – where do you get the code snippet from the first se…[Read more]