Jim Moore

Some LiPo batteries have the JST connector reversed and that may be your problem.  Check the battery with a VOM to make sure the red wire is + and black is –

@shicks.  I tested the converters you recommended and they appear to work as expected:

dropout voltage is 8 Volts and will support input voltage to 31.5 V (max on my bench PS).

No load draw is 3.64 mA at 12 V and 2.83 mA at 31.5 V.

A lower cost option is a three terminal non-isolated converter at $2.76 ea vs $12 for the PlusRoc.

Thanks!  I just ordered two.  My four port sampler project uses 12V motors which draw about 0.4A so I guess that would be an option to use the 12V output and LiPo 3.7V batteries.

I assume this converter uses switching so it should be reasonably efficient.  I’ll le you know how they work.  Good old amazon – I should get them tomorrow!

Hi @shicks  I got my 5 pack of the v1.1 boards today and I noticed that:

• Removed External/Lipo slide switch since it’s no longer needed

Does that mean I can no longer power the Mayfly from a 12 V supply?  I have an application for water sampling and the pumps run on 12V and they are controlled by the Mayfly so I can power the whole system wit…[Read more]

It may be that MMW doesn’t like the underscore.  I had a similar problem when I used # in the name of my stations.

@shicks

I emailed the sketch and the associate pio .ini file.

Thanks for looking into this.

I assume that the NeoSWSerial function is needed. to talk to the sim7080 and that is why I am not getting any response from the modem

The new sim7080 is plugged directly into the Mayfly 0.5b.

@srgdamiano @hicks

Current status of my problem; I am using the 0.5 Mayfly board and have changed to appropite line from 18 to -1 and I get compile errors related to NeosWSerial.ccp.  I have updated all my libraries and still get the same error.

If I comment out the lib entry for NeoSWSerial the sketch compiles but when loaded the console…[Read more]

<h2 class=”user-nicename”>@srgdamiano</h2>
Hi Sara-

I spelled your handle wrong so maybe you didn’t see this.  Do yo need more details?

I observed the same issue on one of my sensor stations with last data on Dec 7 at 12:55. I have 4G modems and was working fine till then.  I am located in elverson Pa.  I thought it was a modem failure which Shannon has had a bunch of.  Maybe the Amazon cloud server problem.

I just tried this with Safari on my iMac and the scroll works to change scale so must be a Chrome problem which I typically use.  I have Chrome Version 89.0.4389.82 (Official Build) (x86_64)

btw Robert S response didn’t show up in this thread

My problem is that GMI_EC1 has conductivity spikes up to 900,ooo µS. The TSA chart auto scales to that level.  If I hover over EC axis and left click I can shift the scale location but I want to hover around zero and expand the scale so the all the lower EC readings are displayed.  I could do this a few weeks ago and my mouse wheel is working on…[Read more]

I noticed this week that the TSA charts can not be scaled with the mouse scroll button but they can be shifted.  Something changed since I was able to scale and move any of the displayed parameters.

I couldn’t find this issue in any other threads so I bring it up here.  Perhaps there was a recent update and that feature got broken?

Couple of clarifications:

• The discharge is a fixed load of 22Ω so ohm’s law works!
• My question is why is the Mayfly station drawing less and less current as it approaches 3.3 Volts?  Yet the 4G modems continue to work and upload the data.
• I believe that Shannon said that some older sd cards tend to cause current draw during sleep mode.  Ma…

[Read more]