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@neilh20
active 3 hours, 7 minutes ago-
neilh replied to the topic Connecting XBee3 LTE to the internet in the forum Mayfly Data Logger 2 days, 8 hours ago
I had a similar problem – see my comment in https://www.envirodiy.org/topic/trouble-registering-with-lte-m-network-on-hologram/
The fix that seemed to work was if it didn’t connect after a 100 AI status polls it issues
gsmModem.sendAT(GF(“+CREG”));
Search for +CREG in…[Read more] -
neilh replied to the topic Trouble registering with LTE-M network on Hologram in the forum Other Questions 2 weeks, 5 days ago
Yup – the network is challenging when making it work, and adding to the biggest and most diverse machine in the world.
I’ve been more the old wireline, POTS to ISDN (now ADSL) – moving the analog to the CircuitSwitched Digital, and now its packet switched.Though when I was working with one customer, when our product wasn’t connecting to the…[Read more]
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neilh replied to the topic Trouble registering with LTE-M network on Hologram in the forum Other Questions 2 weeks, 5 days ago
No problem – I appreciate the earlier tip.
What I haven’t figure out is there another manual that specifies +CREG cmd – it isn’t in the user manual I’m using.
I have seen it before where latest manual “inherits” a context of another set of cmds specified in an common manual. -
neilh replied to the topic Trouble registering with LTE-M network on Hologram in the forum Other Questions 3 weeks, 1 day ago
Thanks for the tips here.
I’ve also had trouble with a new Hologram SIM registering to the cell network with a Digi XB3M1.
I had a working hologram SIM that connected straight away, and then would power off and swop in the new Hologram enabled SIM, and it would poll the cell tower and not work.
I started trying about 2weeks ago, had to move on…[Read more] -
neilh posted a new activity comment 3 months ago
For a fully built commercial offering this has just been announced. Select only the 4-20mA Input Adapter
https://www.onsetcomp.com/products/data-loggers/rx2100 -
neilh posted a new activity comment 3 months, 1 week ago
So to restart the thread – it can be done with RS485 wing board to generate a switched excitation voltage (from the LiIon). The voltage probably needs to be 14V+ so could be U3V50F24 to generate 24V.
To measure the 4-20mA accurately use Adafruit INA219 with a 10ohm resistor.
https://www.adafruit.com/product/904
The Mayfly has the INA219 drivers,…[Read more] -
neilh posted a new activity comment 3 months, 1 week ago
Hello Mark – oops I’m thinking in another dual world – my brain fart.
The sensor is 4-20mA (i’m using that type of sensor in non-mayfly Onset U30 loggers and trying to move to Mayfly/RS485).
The 4-20mA with excitation 12-36V is much simpler, but it is not supported directly by Mayfly.
The excitation voltage can be done with the switched…[Read more] -
neilh posted a new activity comment 3 months, 1 week ago
It sounds like the RS485 Wing Shield would work for you, probably standard voltage option but you should check it works. It does require assembly and soldering.
I was wondering if you have the sensor manual including data protocol and what RS485 registers,-
No manual. Just a data sheet I can’t read
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Hello Mark – oops I’m thinking in another dual world – my brain fart.
The sensor is 4-20mA (i’m using that type of sensor in non-mayfly Onset U30 loggers and trying to move to Mayfly/RS485).
The 4-20mA with excitation 12-36V is much simpler, but it is not supported directly by Mayfly.
The excitation voltage can be done with the switched…[Read more] -
We are expecting to do a little soldering and working on the Mayfly sketch. The data will be sent via Wifi to our own server and to EnvironDIY
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neilh posted a new activity comment 3 months, 2 weeks ago
Hi Mark
Thanks for sharing – just wondering what your power supply source is. Are you solar powered, running of the LiIon battery or another source.
Technically the spec says “Power Supply:12~36VDC” – that is nominally 24V, but actually a range. That would fit with the…[Read more]-
Thanks for the great information. I will look into these items and get back.
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We are planning to be solar powered using a 2500 mAh 3.7V battery and Voltaic Systems 2W/6V solar panel
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It sounds like the RS485 Wing Shield would work for you, probably standard voltage option but you should check it works. It does require assembly and soldering.
I was wondering if you have the sensor manual including data protocol and what RS485 registers,-
No manual. Just a data sheet I can’t read
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Hello Mark – oops I’m thinking in another dual world – my brain fart.
The sensor is 4-20mA (i’m using that type of sensor in non-mayfly Onset U30 loggers and trying to move to Mayfly/RS485).
The 4-20mA with excitation 12-36V is much simpler, but it is not supported directly by Mayfly.
The excitation voltage can be done with the switched…[Read more] -
We are expecting to do a little soldering and working on the Mayfly sketch. The data will be sent via Wifi to our own server and to EnvironDIY
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neilh started the topic Salt water marsh monitoring project in the forum Infrastructure and Equipment 5 months, 2 weeks ago
I came across this project discussion “Measuring internal temp of oysters and mussel” which has a lot of good discussion and thought it would be good cross-reference for anybody interested in a infrastructure and equipment discussion
https://www.thethingsnetwork.org/forum/t/measuring-internal-temp-of-oysters-and-mussel/26492/6
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neilh posted a new activity comment 9 months, 1 week ago
Cal – Some thoughts, if you are using the Mayfly’s battery measurement its not actually measuring the LiIon battery voltage. How are you connecting the solar cell and what rating is it?
If the battery is charging, its taking current and the voltage indication is close to that of the battery – depending on how much solar there is. For the voltage…[Read more]-
Neil – there is no solar panel on this setup. We swap the battery with a new charged one after 3 months use.
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neilh posted a new activity comment 9 months, 1 week ago
Unfortunately I am seeing some issues with the LiIon battery measurement. I think the issue is that the battery measurement uses a 10M/2.7M resistor with a high impedance Analog input, and if its in an RF noisy location (roving cell phones) it can detect some of that energy. Wires can behave in two ways – on the one hand they conduct current,…[Read more]
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Neil – I saw the spike on my Mayfly for the 2nd time last week. I think I have a different problem than you – and I think my problem is battery related. The spike goes from 4v to 5v then tapers back down over several hours. I can’t imagine any stray electromagnetic field causing that kind of jump for that kind of time span in the middle of…[Read more]
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Cal – Some thoughts, if you are using the Mayfly’s battery measurement its not actually measuring the LiIon battery voltage. How are you connecting the solar cell and what rating is it?
If the battery is charging, its taking current and the voltage indication is close to that of the battery – depending on how much solar there is. For the voltage…[Read more]-
Neil – there is no solar panel on this setup. We swap the battery with a new charged one after 3 months use.
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neilh replied to the topic Trouble initializing XBee3 LTE-M in the forum Mayfly Data Logger 9 months, 1 week ago
Thanks.
The cct V0.5b shows an option of connecting the Xbee to the LiIon V_bat – which can get to 4.2V – and a very nice low impedance for the Cellular Tx power requirements.
So if the Xbee-V1-UT/XB3-C-A2 Cellular @ 4.2V was pulling up, that would over drive the mega1284 pins above their Vcc (3.3V).
At some point the megas1284 protection…[Read more] -
neilh replied to the topic Trouble initializing XBee3 LTE-M in the forum Mayfly Data Logger 9 months, 1 week ago
Oh good to hear it works.
What pin are you using on the Mayfly.? I could see the references in the code on modemConnect() but couldn’t find any designation.One of the problems is that the ATmega1284 doesn’t have any 5V compatible pins, so it may cause some unpredictable behaviour if it pulls the mega1284 pin up too hard – which depends on the…[Read more]
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neilh replied to the topic Trouble initializing XBee3 LTE-M in the forum Mayfly Data Logger 9 months, 3 weeks ago
I’ve also had this problem with the Xbee S6 WiFi. However I’ve lowered the polling rate and a few other tweaks of the TinyGSM and its been better https://github.com/neilh10/TinyGSM.
@cal the Mayfly 0.5b schematic diagram of the U6/XBEE-1XBEE-1_LOCK shows the RESET pin5 – the schematic symbol of circle on the mainbody is typically a way of…[Read more] -
neilh posted a new activity comment 10 months ago
Hello Jesse, great you joined.
Can you need to provide a bit more information.
It is **normal** ~ though perhaps undesirable and non-intuitive ~ for a depth measuring instrument to show a slightly negative depth when outof water. Depending on the type of physical sensor they don’t know 0.0 – they have to be calibrated for it, and even that,…[Read more]-
Hi Neil,
Thanks for your reply! This sensor is submerged deep in a pool. After I saw that it had a negative reading, I cleaned the outside of the probe, put it back in the water, and took another reading and same thing, negative numbers. Some I’m not sure what to try.
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neilh commented on the post, Build Your Own EnviroDIY Sensor Station 11 months ago
Wow. Thankyou Stroud Water team for detailed how-tos. Fantastic stream side setup for Mayfly, as well as good reference material for how to do water quality collection.
One comment, is that we’ve seen sensor cables being gnawed. So we’ve tended to put the cables communicating to the sensors in a flexible PVC sheath. In the West we also get…[Read more] -
neilh replied to the topic Water Monitoring in remote locations with a solar Particle Electron in the forum Environmental Sensors 11 months, 1 week ago
Nice write up on github thankyou. I’ve got the ParticleIO WiFi going for one project. Particularly interesting your TDS references thanks.
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neilh replied to the topic SDI-12 library support in the forum Environmental Sensors 11 months, 2 weeks ago
hi @frbiggs I’ve used the teensy – but it comes in a number of flavors.
Checkout https://github.com/duff2013/SDI12_T3
IHMO the Teensy3.5 also has +5V tolerant pins.
The Teensy3.5 and 3.6 processors have some nice ram. https://blog.adafruit.com/2016/10/06/new-products-teensy-3-5-teensy-3-6/Can you say what your context is – are you looking to…[Read more]
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neilh posted a new activity comment 11 months, 2 weeks ago
that sounds pretty fantastic. Of course doesn’t indicate long term reliability and the issues are mechanically how to connect the water pressure with the mineral oil. I’d be interested in how you are thinking about doing it in a steam with the logger connection is say 20′ above the point of measurement. But its giving me someother ideas. I’m…[Read more]
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Great info. We will look at that approach
For a fully built commercial offering this has just been announced. Select only the 4-20mA Input Adapter
https://www.onsetcomp.com/products/data-loggers/rx2100