neilh20

Erik any board that has a  SAMD21 with a uSD/flashDrive and  external RTC DS3231 https://www.adafruit.com/?q=DS3231&sort=BestMatch is probably a good target for using with ModularSensors.  https://shop.sodaq.com/search/SAMD21/ and look for LTE cellular or other cell to match your local network.  LoRa seems unlikely to work with MMW but could pos…[Read more]

Hello Nancy, With some students we created a new site https://monitormywatershed.org/sites/SSU_ENG_SD02/ and its having an issue with displaying the time in the front page TSV and I entered an issue on it …

https://github.com/ODM2/ODM2DataSharingPortal/issues/560

Looking at your https://monitormywatershed.org/sites/Tom-Nat/  seems…[Read more]

I’ve been building electronic circuits since high school. In case its of any use, I’m now using Kicad 6.0 https://www.kicad.org/blog/ and it has been excellent for reasonable human place able surface mount geometries of 0402 and larger. There is an evolving library of component footprints . Any non-standard footprint are possibly where the real…[Read more]

Well I’m working with some engineering students at 9am PST (10min) on how to modify Kicad files. A bit short notice but you could join in then if interested.

@Erik_G just an FYI, its made to look easy by Shannon, however it takes a lot of experience to get it right and then make it available as purchase.

Typically to do an order with a PCB assembly service, the qty of 50 is when there is the lowest cost per device. However assembly services only assemble to the instructions you provide. If you provide…[Read more]

Just as refresh this is my  data while working with a prototype SDI-12 level shifter.

https://github.com/neilh10/ModularSensors/issues/12

@james_nz    my process is to stage systems in an accessible context to check the reliability of the systems. This comes from the school of hard knocks working with embedded processors like the Mayfly.

IMHO while  ModularSensors software has some fantastic classes to be able to access the instruments and also to push to cloud locations, Ar…[Read more]

@James_NZ – are all your setups the same?.

Have you got a spare setup that can be debugged in a local setting? (office with terminal connected)

I have a similar setup with an RS485 and SDI-12 on one system – but I maintain a test system to verify it before I deploy it.

https://monitormywatershed.org/sites/TUCA-Na13/

I have done work to rug…[Read more]

@James ouch.  Looking at the data file, its just the Decagon CTD/SDI-12? readings that are responding -9999 . Typically that means the (SDI-12?) protocol has failed to communicate with the instrument.

At the same time Yosemite/Modbus? is responding well.

The CTD is only occasionally failing, or failing in groups, but still working some of the…[Read more]

Nuts you lost one.

Unfortunately it take the Digi “Xbee TH Development Board” to do an upgrade.  Hopefully the new ones will be come with the latest software.

Hi Dan, wow interesting it works to 3.2V.  Yes RS485 should work well and it can go a long distance.

You do need a physical RS485 driver wing board that will fit with the UART pins. RS485 is a specific differential voltage protocol that can travel thousands of feet on two wires. The instrument requires 4 wires. See above for examples.

My…[Read more]

Thanks for checking with Dave on that. Good points about what might create some sounds.

@zeke-holloman communications – peer2peer – is a deep subject.

Many years ago I wrote the code for a comms stack to use the 9bit UART to poll an array of processors. In the end it was 2people for 18months to get it working reliably.  So its not trivial, but i had a fantastic time with…[Read more]

Hey great. Many thanks