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neilh20 replied to the topic Battery Measurement accuracy in the forum Mayfly Data Logger 4 years ago
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]
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neilh20 replied to the topic Monitoring power consumption in the forum Mayfly Data Logger 4 years ago
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]
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neilh20 replied to the topic Monitoring power consumption in the forum Mayfly Data Logger 4 years ago
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]
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neilh20 replied to the topic Monitoring power consumption in the forum Mayfly Data Logger 4 years ago
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]
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neilh20 replied to the topic Mayfly with LoRA module physical connection in the forum Mayfly Data Logger 4 years ago
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]
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neilh20 replied to the topic Buy 20-25 Mayfly Data Loggers and Proto Shields in the forum Mayfly Data Logger 4 years ago
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.
Some…[Read more] -
neilh20 replied to the topic Depth measurement using MaxSonar in the forum Mayfly Data Logger 4 years, 1 months ago
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]
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neilh20 replied to the topic Remote Programming of MayFly Data Logger in the forum Mayfly Data Logger 4 years, 2 months ago
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]
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neilh20 replied to the topic Inexpensive DIY conductivity sensor in the forum Environmental Sensors 4 years, 2 months ago
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]
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neilh20 replied to the topic Inexpensive DIY conductivity sensor in the forum Environmental Sensors 4 years, 2 months ago
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]
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neilh20 replied to the topic Logging Mayfly with Decagon SDI-12 Sensor in the forum Mayfly Data Logger 4 years, 2 months ago
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.
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neilh20 replied to the topic Logging Mayfly with Decagon SDI-12 Sensor in the forum Mayfly Data Logger 4 years, 2 months ago
Just an FYI, as I understand the SDI-12 spec, the receiving instrument should receive 3.5V for a ‘0’ or space. The mayfly port is only capable of supplying 3.3V – so it may work for most SDI-12 instruments, and is working for one SDI-12 instrument I’m using
Typically with off-spec issues, things can work on some instruments and then not on…[Read more]
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neilh20 replied to the topic Connectors for 20-pin headers in the forum Mayfly Data Logger 4 years, 2 months ago
There is a Mayfly Protoshield rev1 – but I can’t find if its for sale anywhere.
I have one, and no plans for it right now so if you wanted it I could send it to you.
The details are here, but no gerbers. With gerbers it would be possible to order the base boards directly from o…[Read more]
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neilh20 replied to the topic Connectors for 20-pin headers in the forum Mayfly Data Logger 4 years, 2 months ago
Hi Matt,
There is a Mayfly prototyping board, which I should have used for one project, and forgot to 🙂
I’ve prototyped with a basic 2×10 male to male header using wire wrap and soldering to the header. However I cut the 2×10 from a larger length I had, and it became unreliable pretty quickly. For a cable maybe 0.05″ ribbon cable with IDC he…[Read more]
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neilh20 replied to the topic MMW Data Outage? in the forum Monitor My Watershed 4 years, 2 months ago
The response is great.
For my WiFi/Xbee S6 accelerated updates 2min sampling update every 4minutes the ACK time over 700 POSTS time is between 200mS and 774mS. All POST succeeding 1st attempt.
For my Verizon/Xbee LTE at 15minutes sampling the ACK time is typically 5sec, very occasionaly about 1.5sec, and also 7Sec. For this test it delivered t…[Read more]
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neilh20 replied to the topic MMW Data Outage? in the forum Monitor My Watershed 4 years, 2 months ago
Over the last couple of days I’m getting very good response when using a WiFi, and the response time for 201 ack is sub 1second.
This is a fast check with 2min sampling time, and SendX=2, so delivery every 4minutes. I get a response typically under 0.5seconds, and occasionally ~ 0.6Seconds. So for 1250 messages all have been delivered, 1st time…[Read more]
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neilh20 replied to the topic MMW Data Outage? in the forum Monitor My Watershed 4 years, 2 months ago
Hey good to hear.
I haven’t been able to do a lot of testing, and I was out yesterday but I enabled a laptop computer to monitor one beta system overnight that is using verizon starting at 9pm PST. (though I forgot to add the power cord to the laptop and it turned off after 2hrs !! ). Its sampling at 15minutes, taking 8 readings, and pus…[Read more]
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neilh20 posted a new activity comment 4 years, 2 months ago
Thanks for the posting. In N California I’ve had a squirrel chew through some power wiring at one site. I think in the end it was to do some armored flexible PVC tubing.
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neilh20 replied to the topic MayFly Kit/Bee Adapter availability in the forum Mayfly Data Logger 4 years, 3 months ago
Thanks for the headsup. I was checking yesterday so wondering what the status was. Many thanks
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neilh20 replied to the topic Campbell Scientific CS-215 SDI-12 communication issues w/ Mayfly in the forum Mayfly Data Logger 4 years, 4 months ago
Looking at this posts as a discussion on general SDI-12, I have the Mayfly interface working for a Insitu LT500 Water Level monitor in a prototype capacity.
The LT500 requires an 8-36V Excitation, so I put in a series booster, +12V https://www.pololu.com/product/2117, and connected the other end to Grove 4pin JST-PH cable (std one cut in h…[Read more]
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