Sara Damiano

I hate trying to read any detailed explanations of cellular network architecture because there are a truly ridiculous number of acronyms used and I don’t use any of them enough to remember what they mean. It feels like 3/4 of the explanations of network architecture forget to define 3/4 of the acronyms so I’m always floundering back and forth…[Read more]

What manual are you using? CREG, CGREG, and CEREG are all in the AT commands manual for the SARA R4: https://www.u-blox.com/sites/default/files/SARA-R4_ATCommands_%28UBX-17003787%29.pdf

CREG = Network (circuit-switching) registration status
CGREG = GPRS (packet-switching/General Packet Radio Service) network registration status
CEREG = EPS…[Read more]

I’m sorry I haven’t been responding on this. I’ve been working on other data projects and haven’t had a chance to look into this at all yet.

Where is the extra red (5V?) wire in your pictures from September connected? It looks like you have the Yosemetich connected to one 12V power supply (red line at the bottom), the Mayfly powered by second 5V power supply (the black/red twisted pair?) and then the Mayfly also connected to the computer’s USB. But then I can’t figure out the extra…[Read more]

The status of the communication between the Yosemitech’s and the Mayfly hasn’t changed since May.

The library for communicating with the Yosemitech’s is here: https://github.com/EnviroDIY/YosemitechModbus

It depends on the SensorModbusMaster library here: https://github.com/EnviroDIY/SensorModbusMaster

If you want to use the Yosemitech in…[Read more]

That looks like the converter I have. If you’re sure you have the right A & B wires, your doppler is powered, and the lights on the adapter are flashing, but you’re still not getting anything on the Mayfly, try flipping the Tx and Rx wires. Different people have different opinions on whether Tx means “the pin I’m sending out data on” or it means…[Read more]

I don’t think there’s any sort of built-in antenna on the LTE XBee3. I was under the impression that the external antenna is absolutely required. I’ve never gotten it to connect without one.

We’ve bought ours from Digi Key. I think we’ve tried a couple of different models and haven’t had any problems with any of them. We’ve even put the 2G…[Read more]

Hardware-wise, do you have an antenna attached to the “cellular” uFL connector? You’ll never connect without an antenna.

But.. these LTE boards are just more finicky than 2G, so…

You’re using the example from ModularSensors, right? https://github.com/EnviroDIY/ModularSensors/tree/master/examples/logging_to_MMW That example should work with…[Read more]

You’ll need an RS485 to 3.3V TTL adapter. I *strongly* recommend getting one with built-in flow control. I also highly recommend hooking your doppler up to the Mayfly’s Serial1 unless you have good reason not to.

Once you have the connector you should be able to transfer data from the doppler to an SD card using a library like SdFat and a simple…[Read more]

Do you have the FTDI VCP drivers installed? https://www.ftdichip.com/Drivers/CDM/CDM%20v2.12.28%20WHQL%20Certified.zip That’s the chip on the Mayfly that handles the USB communication.

You set pin 22 high in whatever program/sketch you’re using.

I don’t have a uBee with the R410M, but I’ve updated a whole bunch of the Digi boards with the u-blox “Easy Flash” software and direct USB to the SARA chip. You should be able to use the same firmware and software to update. You may even be able to do the update through the serial port without soldering a USB connection on. (Sodaq breaks the…[Read more]

Do you have the latest u-blox firmware?

Yes, I’ve seen this sort of thing.

Well, not precisely, but similar. The Digi LTE XBee3’s have the same chip and I’ve seen it happen several times that the XBee refused to register, then I put it in bypass to check the registration, got it to register, then it magically stayed registered when I went back. I haven’t seen it consistently, though,…[Read more]

You’re missing some rows of your header. That file will definitely not work.

At minimum, you need the text “Sampling Feature UUID: ” before that UUID and another row that specifies the UTC offset with the text “Date and Time in UTC-#” where # is your offset. You can put all the result UUID’s on the row with the feature UUID as you’ve done, as…[Read more]

Since we are not using the screen any longer, I2C is also no longer being used.

No. If you are using either the DS3231 real time clock or the TI1115 analog-to-digital converter built into the Mayfly, you are using I2C. Both of those are I2C chips.

It’s possible that there is a short-circuit in the Mayfly, but this sounds more like a problem with your code or sensors.

When you’re posting code, please use the “Add Code Snippet” button. It adds coloring and formatting which makes the code much easier to read.

When you’re troubleshooting the boards, make sure to check the position of all of…[Read more]

You can also try dropping the minimum battery voltage for the modem to ~3.5. Shannon has suggested that, especially if the battery voltage is going down at night but is likely to be recharged once the sun comes out.