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Hi,

I have a problem in communication between arduino uno and yosemitech Y504-A (http://yosemitech.sell.everychina.com/p-101690172-y502-a-online-optical-dissolved-oxygen-sensor.html). I use MAX485 module (https://hobbycomponents.com/wired-wireless/663-max485-rs485-transceiver-module). Honestly I am new in Modbus, so please teach me how to solve…[Read more]

That configuration looks good to me.  Let me know if you see any bugs I can smash.

Here’s our platformio.ini, which I didn’t post earlier. It’s identical to what works from my desk, so don’t suspect there’s a problem here.

;PlatformIO Project Configuration File
;
;   Build options: build flags, source filter
;   Upload options: custom upload port, speed and extra flags
;   Library options: dependencies, extra library storages
;…

[Read more]

Yes, that’s what it should have done.  I don’t see any obvious reason why it wouldn’t have, other than that it clearly didn’t.  The single battery measurement was on the low side (only 3.6) so it is possible that your battery just died.

No problem.

So, to make sure I’m understanding: the funky date issue aside, had the Mayfly connected to the internet successfully, we believe it would have set its clock from NIST and would have begun uploading successfully to MMW, right? Testing at my desk, I’m able to take a new, out of the box Mayfly, drop in an XBee3 (with previously…[Read more]

I made an issue for myself to fix this: https://github.com/EnviroDIY/ModularSensors/issues/304  Unfortunately, that doesn’t give you back lost data.

Oh.  Oops.

The data was probably rejected because of the timestamp.  The clock resets itself to 2000-01-01T00:00:00 – but then ModularSensors applied a negative offset to it assuming you wanted the file to be in UTC-6 with an RTC set in UTC.   That caused a weird rollover (roll-under?) giving you a timestamp of 2000-01-01 252:211:00.  Moni…[Read more]

Shannon, can you share your code for enabling the Mayfly to keep track of the cumulative total?

That’s good to hear. Yep, all looked as expected in the data file on the SD card. It was named with 2000-01-01, so apparently never connected and synced to NIST. I’ll zip and attach the csv file, in case that illuminates anything. I am noticing that the Mayfly temp has a bad value (-17966.2), which is odd.

The SD card did have data. I left the SD card in  long enough to complete one measurement. Attached. I then removed the SD card and took it home to look at the data, but left the station running without an SD card because I didn’t have a backup on me at the time.

I didn’t try running it, but there’s nothing that jumps out at me in a very quick glance through the code.  Did the SD card have data on it?

Apparently TSA does not fill in for data gaps and only displays the most recent data.  I have had this problem when trying to fill in data gaps for SL150 when it was not communicating with the mother ship (MonMW).  These issues has been posted on github.  See issue 430 and 443

I’ll attach the code here. Thanks, Matt

Yes

That does seem worthy of a new thread; those are the Bee’s we’re using so I’m more familiar with them.  They’re easier for us to get (no international shipping), similar in price, have carrier certification, and have a secondary processor that takes care of the baud rate trouble.

I don’t think we’ve had any yet that were DOA, but we have managed…[Read more]

Was anything recorded on the SD card?

Thanks for your quick responses! The shipping constraints are good to know; going forward I won’t remove the battery after setting the clock.

I was able to confirm, using PCSync, that my development mayfly does lose its clock setting with power and coin cell disconnected. No surprise there. And then I disconnected USB power again, then…[Read more]

There’s no reason to remove the CR1220 coin cell battery before shipping the board.  You’re not able to ship loose batteries, or larger multi-cell batteries, but it’s okay to ship one watch battery if it’s installed in equipment, such as being inserted into the Mayfly’s battery holder.   Don’t ship more than one at a time, and protect the Ma…[Read more]

If you remove both the coin battery and the mayfly loses power, even for an instant, the clock will reset to Jan 1, 2000 0:00:00.

The coin battery isn’t necessary if there’s another power supply, but it’s very convenient to power the clock with its own battery so that you don’t have to reset the clock every time you turn the Mayfly off.  The…[Read more]