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Hello Shannon/@shicks – thanks for the detail.I missed that it was an internal connection on the mega1284 to the 3.3V
The issue with the 3.3V, is that it is connected to the LiIon through the regulator SPX3819.
The regulator has a dropout that is variable depending on the load, temperature etc – so from the datasheet at load of 500mA it could be…[Read more]

The AREF pin of the micro on the Mayfly is not tied to anything (except through a capacitor to ground as suggested in the ATmega datasheet), so when you use the standard analogRead(0) command, it uses the default 3.3v reference setting. If a user is more advanced and wants to use an internal reference by using certain commands, or by connecting…[Read more]

I’ve spent more time fiddling with the LTE-M XBee and I’m seeing the same results.

It’s a hardware problem, not software; the modem really does stop responding. I wonder if it’s that there’s not enough capacitance along the power line causing very short voltage drops even when it’s tied right to the battery. The user guide for the LTE-M XBee…[Read more]

I’ve made an Arduino library for communicating with the Yosemitech sensors: https://github.com/EnviroDIY/YosemitechModbus

It’s built on top of my modbus library: https://github.com/EnviroDIY/SensorModbusMaster

In the modbus library there’s a hardware folder with the plans for a little “wing” board to more easily connect a Yosemitech sensor to…[Read more]

Hi Thomas and anthony,

I know it has been long since the post was discussed but by any chance did you guys move along with the project and made any breakthroughs? It would really help me alot.

Thanks

Oh dear. That definitely *is* a problem. And that’s entirely my fault; I hadn’t error-checked that json in a long time. It should be fixed now.

Just FYI, there’s a lot in that library bundle.

I’ve usually seen that “no response” pattern with the 3G XBee’s without the solder jumper. I’ve assumed it was them “browning out” as they tried to connect to the internet. With those, switching the solder jumper seemed to fix the problem. Have you been able to connect to the internet at all with the LTE-M XBee? Is it working attached to a…[Read more]

We’ve bought these ones from Oregon Rule: https://oregonrule.com/product/superior-staff-gauges/ They don’t rust like the WaterMark ones eventually do. And, at least in the US, they’re cheaper.

Thank you Shannon.

OK, I cut the trace and confirmed no continuity between BEE_Vcc and 3v3 at SJ13. Then I made a solder bridge between BEE_Vcc and LIPO. I have ~4.1V between GND and LIPO/BEE_Vcc.

The modem powers up and is evidently powered by the battery now but I still end up with the NO RESPONSE messages…

That simple Xbee serial printing example doesn’t require any additional libraries installed in you IDE or called by your sketch. All it is doing is printing text to the 2 separate hardware serial ports on the Mayfly.

I have never used the programmable versions of the Xbee 900HP. There are infinite combinations of ways to configure an Xbee…[Read more]

The Mayfly’s bee footprint was originally set up to only power modules that require moderate current supplied to the Vcc pin of the module, such as Xbee RF modules (900Mhz and 2.4Ghz), Bee wifi, and Bee bluetooth. There are even GPS modules with the Bee footprint that work great on the Mayfly. Then when we started using 2G and 3G cellular…[Read more]

OK, looking at the GitHub issue, it looks like I may need to Solder SJ13 after all…?

Shannon,

This is very helpful! We’ve ordered a few XBee PRO S3B 900 modules but are having trouble getting them to communicate via the Mayfly script.

One thing we think may be a problem is whether or not we chose the ‘programmable’ version of the modules. I noticed that Scott had an issue with this in another post from earlier in the Spring, and…[Read more]