neilh commented on the post, Evaluating Maxbotix Ultrasonic Sensors for Monitoring Stream Base Flow 4 days, 1 hour ago
Thankyou so much for doing such detailed work. I’d been thinking of a boom situation for some measurements. However the atmospheric temperature will vary.
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
Just wondering if anybody has looked at algorithms for battery capacity.
For logging reliability, when a LiIon battery is low in available energy, it would be nice to reserve the available energy for just the core logging functions (ie no high powered radio transmission).
I mentioned some work I’m doing in this thread…[Read more]
neilh replied to the topic DFRobot Gravity KIT0139 Depth Sensor – Routine Interference? in the forum Environmental Sensors 1 week, 2 days ago
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]
neilh started the topic Two depth sensors for reliable depth measurement confidence in the forum Mayfly Data Logger 1 month, 1 week ago
I’ve released a Mayfly image that interfaces to two depths sensors – an Insitu LT500 and Keller Acculevel – and pushes the readings to MonitorMyWatershed.org over a Digi LTE CAT-M1 modem.
As a binary image, anybody can download it into a Mayfly, no programming experience needed. https://github.com/neilh10/ms_releases
The per station…[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
and when below <3.85V only
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]
Hi Anthony, I would also be available for testing/helping integrate LoRa networking and I have some gateways. Wow great news to hear there is an implementation done.
For my local SSU I volunteer as Industry Advisor, and for last years Engineering Capstone project a student used an Adafruit LoRa module on a raspberry pi pretty effectively.…[Read more]
Hello I’ve just had a request to quote for a number of water monitoring devices, each one includes a Mayfly. I’ve put on the response quote subject to availability of the Stroud Water Research Center’s Mayfly.
Is it useful to be able to indicate potential demand?. Its a pretty typical thing for selling that there is a demand forecast.
Hi James, thanks for the agupubs reference – very nice to see the LiDar work.
I had talked to a LiDar guy some years ago and they had said they didn’t think it would work for streams, but that ref is showing it very nicely.
I’ve used 20mA depth sensors with Onset loggers, and had a couple of UL6a…[Read more]
Interesting idea for a secondary board, perhaps linked into the USB. I have heard it done before via the JTAG, but I don’t believe this is available for Mayfly.
Possibly the biggest question on issues like this is power budget. If there was a reliable power budget for a linux SBC (beaglebone.org) it would be relatively easy.
One area to track…[Read more]
Hey happy to contribute where I can.
My wife and I started a trip in Hamilton with some friends in 1990. Spent 2 months traveling round NZ as part of a round the world trip. 🙂
I have a fork of ModularSensors and focus on a small subset of sensors, scaleability through ability to build releases, download a defined binary of the code, and test…[Read more]
Hi James, great to hear someone else interested. I just got a “relative EC” working nicely and just gave them out to be deployed last week.
The “relative EC” is to be able to measure stream disconnect. For the <<dry>> hot climate we have in California, looking to monitor when the stream goes dry.
There is no reason why it can’t calibrated,…[Read more]
I have come up with an inline plug-in circuit that will do the voltage shifting ( and generate a +12V power and ESD protection) that I’m working on, so just mentioning it here. If anybody is interested in the discussion we could take it to a separate thread.
- Load More