neilh

I’ve received more “LTE Bee Adapter” cards, and looking to experiment using it to investigate why the  Xbee WiFi S6B is not reliably connecting to the local wifi network. https://github.com/neilh10/ModularSensors/issues/21

The LTE Bee Adapter card provides power directly from the LiIon battery, control of the Xbee reset, and potentially also an…[Read more]

Well after running for some time with the WiFi S6B, and still having problems after it has been running for a couple of hours,
I’ve switched to one my target field internet comms of Digi XBee3 LTE-M over Verizon.

Very interesting the Digikey RevXsystems https://dataplans.digikey.com (thanks to @mbarney for the suggestion) has a new low cost…[Read more]

Some status – the periodic Mayfly RESETs turned out, I think, to be happening when polling the Insitu LT500 gauge over SDI12. https://github.com/EnviroDIY/ModularSensors/issues/344

The new code breaks the polling of the Insitu LT500, I’m doing debug under various scenarios to try and under stand it.…[Read more]

The latest release of ModularSensors 0.27.0 has a new simple electrical conductivity sensors ~  AnalogElecConductivity.h/.cpp

Thanks to Sara for accepting it as a MS  sensor and formatting it to the latest  documentation style. See the amazing Doxygen generated  https://envirodiy.github.io/ModularSensors/group__sensor__analog__cond.html

Sara has…[Read more]

Hi Matt – well been watching the output of the LC709203F with some other testing. It does work for the accurate battery voltage measurement.

However the LC709203F “%” capacity  could be challenging to use.  There is a lot of technical discussion about battery fuel gauges and what works and doesn’t.  Another device that I got was the Seeed LT…[Read more]

My experience is that its not capable of that.

I have been doing a lot of testing in pushing up readings to test Mayfly reliable data delivery algorithms I have evolved.  I have in some cases had 6000 points to push (ie 60days of unreported readings at 15minutes per reading), and MMW has been very slow, often after a small number (~10) of POSTs…[Read more]

Continuing some ideas on https://www.envirodiy.org/topic/battery-capacity-fuel-gauge

Hi James, very interesting. I wonder which Analog port on the mayfly you are using,  ADS1115.?

One test I do, to verify the sensors response, is put the sensor in a simulated stationery stream, (jug of water) with a solar aspect, stable power supply voltage, and measure water temperature and water temperature together and see what it…[Read more]

Hi Brian, You may want to describe the type of tipping bucket and the electrical interface for counting .  Some types of relay contacts can oxidize and require a minimum wetting current at some point.    Do you have a link for the ProTrinket.? regards

I’m sharing some integration test results. I’ve been using a Vbat=4.0V threshold – that is under Vbat=4.0V it does sensor readings only, and stores the readings for later reliable data delivery.

When the battery voltage is over Vbat=4.0V it POSTs the readings to MMW.…[Read more]

I’ve had a simple system soak testing.

It has an Xbee WiFi, LiIon 500mA, measuring MayflyVbat and ADS1115 extVbat. When the extVat voltage is >=3.85V it will

Logger dataLogger.logDataAndPublish();

and when below <3.85V only

Logger dataLogger.logData();

I’ve used the 3.85 threshold as I found the Mayfly was resetting when the WiFi turned on…[Read more]

So just to add some more characterization measurements.

I’m using a Mayfly Sn 20395, and attempting to characterize what range the readings from the Mayfly ADC Vbat are linear when it is only powered from Vbat.  I’ve put a resistor network on the extV to the LiIon batter, to halve the voltage to keep it within the Vcc range for the ADS1115.…[Read more]

Hi Matt, power is a challenge. I always think of those battery watches with a tiny battery in them. How do they do it.

My take is this. a) what is the minimum energy its going to collect across the really low solar months  eg winter months  b) What is the longest I want the system to run for with no solar power – that is usually a storm of some s…[Read more]

I should note, that for real world solar panels, the power supplied by the panel is  dependent on the solar photons received. For a  slow change in power delivery some circuits have some strange behaviour.  I’ve had a Mayfly with an LTE  module, and a 2Ahr battery, and at sunset it started resetting. It continued resetting for about 30minutes unt…[Read more]

I’ve been using the INA219 and contributed sensorsTINA219
I’ve used it for measuring a working Mayfly on the lab bench. For  field monitoring, I would think you need a coloumb counter ~ eg LTC2941 ~ I have an adafruit version but haven’t tried it.

On the lab bench I have the INA219 on a separate Mayfly with console and put in in series with the…[Read more]