Just built this with my 4 year old. She loved it! She did the project management and directed me which wire goes where. Got to start them young!

I was really shocked at the brightness of the LED ring. I mean, I knew it would be bright from looking at the videos, but wow.

My setup was to connect my UNO to the PC, load code and branch power directly from the UNO's 5v pin. I had no cap or resistor in place either (neither was there a radio hooked-up). This was just a bench-top proof of concept and it worked right out the box (after I soldered leads to the ring). I went through all the adafruit example codes and worked without a hitch. I may, or may not, exceeded WAF level 10. Now she is giving me more projects for these "neopixel" lights.

Always shield your electronics from the elements. Hurricane Hermine took out its vengeance on my radio.

I had just built this node and was excited to watch the data come in during the hurricane - I did not put into case. Note to self: always put it in a case.

EDIT: Just noticed that my google photos link does not appear to show for me. Not sure if it shows for others. Let me know. Trying plain URL:
https://goo.gl/photos/gELNmGjY5Dk6q7Rj7

@pptacek Had not seen those before. Order some and a few nanos to go with it. I had been using the slim node v2 AA battery boards using just the 328p bare chip. Issue I have with that board is the layout of the pins for my needs. It is a great board and I use the nodes I have a lot - no disrespect meant to the developer of it.

I agree that the entry ramp to get mysensors working is a bit complex. I started with the RPi as the gateway because well, it should work. Had a hell of a time making it function. Ended up getting the RPi hat that has the capacitor and NRF slot on it that plugs into the GPIO headers. But, issues persisted with the library for the RPi not working on the RPi 2 until some very helpful folks pointed me in the right direction. A lot of this is pure tinkering and not yet a prime time off the shelf system. I knew that going in and accepted. It has been a great learning experience. The frustration I initially had was all because I expected the guides/docs to be up to date. They are not. As bad as that is, once you accept it and decided to a) add to the docs yourself or b) carry on screaming it becomes rewarding. As an example, getting MySensors to work in Hom Assistant is easy using an MQTT gateway....until you realize that HA tells the nodes what measurment units to use and the nodes then flip (from Celsius to Fahrenheit) when you think it should do the conversion on the front end of HA. I still, for the life of me cannot get the nodes to flip back to Celsius from an MQTT command (had to reflash the nodes with the code).

At the end of all this I am still having fun and learning new things. As the OP said this is not my first programming rodeo (currently a senior SQL developer working with epic sized data with a massive helping of javascript, R, python, and .NET). The micro controller code paradigm was (is still?) new to me even after almost 6 years of messing around with various projects including MySensors.

If we can help any new people stay on this journey it is time well spent. I offer my services for any help that may be needed for docs or guides.

I have used Domoticz for about 2+ years. I like it a lot but wish for something...more.
Pros:
Quick setup for mysensors nodes
One-stop location for data storage and data presentation
Android app is very good
Customizable scripting options once you leave their scripting environment and use API values.

Cons:
Event scripting (lua? really?) needs more advanced features.
Has interesting issue lately where if I lose power to the Pi I lose all data back to May 23 of this year. I have a cron job that backs up the DB nightly and send to my NAS so I can lose hours instead of days. But, man, is this annoying - I have not tracked down the reason yet.
Graphs are just sort of...there. I do data viz at my job and use Highcharts (Domoticz' charting library) daily. The charts in Domoticz need a lot of work.

I have started writing my own front end that calls data from the Domoticz API (as well as other APIs) for showing info in our house. Nothing crazy cool, but it will eventually work fine for me.

Which brings me to the point - there is no perfect controller. You need to find the one that is right for you.

@stkilda It really depends on how much "control" you want. I run mosquitto broker, node-red (for handling lots of MQTT messages and for internet API calls), and for my controller I use Domoticz. All of this on my raspberry pi 2 B. I have around 1% CPU usage and ~25% RAM usage. There is not a lot of cross-traffic on my system (meaning I only send data to Domoticz from nodes and not the other way around). This works just fine. You can do the same on your laptop given any OS you want to use - your install and config will of course be different. Yes, you need to have your controller on all the time.

Domoticz is the easiest to get up and running. All you need is an ethernet/serial gateway and off you go. I use the MQTT gateway and Domoticz requires its own MQTT topic (lame) but that is easy to setup on node-red (I just rebroadcast my MQTT gateway messages on a the Domoticz topic).

@sundberg84
Yea, by my UNO is used for templating projects for my slimNode. I am only making the ethernet gateway because the direct-connection of the nrf to the RPi is not yet supporting v2 library. Just seems silly to include extra hardware (uno/mega and ethernet shield) when the RPi has GPIO and the nrf can be connected to it. I am using domoticz on the RPi using serial gateway but only with v1.4.

Christmas wreathe for the techie in all of us.
pretty colors
flashing
wire wrapping

Uses a pro mini and a lot of wire-wrapping. Other components on the circuit boards are just there for show.

(ugh, google photos links not showing up so converted to links)

@pptacek Had not seen those before. Order some and a few nanos to go with it. I had been using the slim node v2 AA battery boards using just the 328p bare chip. Issue I have with that board is the layout of the pins for my needs. It is a great board and I use the nodes I have a lot - no disrespect meant to the developer of it.

I agree that the entry ramp to get mysensors working is a bit complex. I started with the RPi as the gateway because well, it should work. Had a hell of a time making it function. Ended up getting the RPi hat that has the capacitor and NRF slot on it that plugs into the GPIO headers. But, issues persisted with the library for the RPi not working on the RPi 2 until some very helpful folks pointed me in the right direction. A lot of this is pure tinkering and not yet a prime time off the shelf system. I knew that going in and accepted. It has been a great learning experience. The frustration I initially had was all because I expected the guides/docs to be up to date. They are not. As bad as that is, once you accept it and decided to a) add to the docs yourself or b) carry on screaming it becomes rewarding. As an example, getting MySensors to work in Hom Assistant is easy using an MQTT gateway....until you realize that HA tells the nodes what measurment units to use and the nodes then flip (from Celsius to Fahrenheit) when you think it should do the conversion on the front end of HA. I still, for the life of me cannot get the nodes to flip back to Celsius from an MQTT command (had to reflash the nodes with the code).

At the end of all this I am still having fun and learning new things. As the OP said this is not my first programming rodeo (currently a senior SQL developer working with epic sized data with a massive helping of javascript, R, python, and .NET). The micro controller code paradigm was (is still?) new to me even after almost 6 years of messing around with various projects including MySensors.

If we can help any new people stay on this journey it is time well spent. I offer my services for any help that may be needed for docs or guides.

@kalina That is some excellent solder work. Last time i tried to do SMD work it ended up being 110% solder, 5% PCB, and 0% component at the end.

@zboblamont Do you have any more info on this? Components and schematic? I am looking to do this as well as Florida is now fully into storm season.

@nagelc This seems to me the proper way to do it. Presentation of data on web/app should not modify the actual data from the node itself. For now HA is a no go for me until I get a chance to look at the HA mysensors code to see what it is doing.

@gohan I am using node-red in the middle because I have other locations I am sending my sensor data (SQL database, etc). The MySensors MQTT gateway talks on mygateway1-(out/in) and it works great. But, Domoticz requires a different topic as listed here (https://www.domoticz.com/wiki/MySensors#Configuring_the_MQTT-gateway_sketch
For Domoticz to work without additional software (like NodeRED), you will have to set MY_MQTT_PUBLISH_TOPIC_PREFIX to "domoticz/in/MyMQTT" and MY_MQTT_SUBSCRIBE_TOPIC_PREFIX to "domoticz/out/MyMQTT".

Node-red is great for this sort of stuff. I re-broadcast the mygateway1 on the domoticz topic.

I did not add a gateway any differently in HA vs Domoticz - I pointed it at the MQTT topic (in HAs case it is the mygateway1 and for Domoticz it is domoticz). HA happens to send back to the gateway (on an MQTT topic I imagine) the setting to change to imperial from metric (which is the default). But, Domoticz did not do this. I think maybe Domoticz gets the metric/imperial setting from the gateway and then, depending on the Domoticz units configuration, converts the value to be shown on the front end. I suppose the next thing for me to try is just use MQTT on HA without setting up the mysensors gateway explicitly. But, not sure how HA would know to convert my values to imperial. Or, I could just re-code my nodes/gateway to force imperial at all times.

So, first here is my general setup:
Multiple DS18B20 temp sensors sending data in metric.
One ESP8266 gateway that is using the MQTT protocol.
A mosquitto broker running on an RPi
Node-red running on the same RPi that re-broadcasts the MySensors topics (mygateway1-out/blah) on the Domoticz required one (domoticz/in/MyQTT/blah).
The same RPi with latest 4.97 Domoticz install listening on their MQTT topics. Domoticz is set to use imperial units of measure.
All is working as it should.

Last night I installed HomeAssistant (not HASS.io) on my laptop and set it up to use the MySensors protocol and to listen in on the mygateway1-out/# topics. And, of course, I set the HA temp units to imperial. Messed around a bit and decided that enough was done for the night (could not get it to talk to my smart TV).

I then checked my Domoticz dashboard and saw that, well, my house was turning into an oven! The 2 sensor nodes are now reporting temps of 170F! I look at the Domoticz log and it isn't a transient event. I then look at node-red in debug and see that the mygateway1-out is sending out F values instead of C values and Domoticz is converting the values from C to F...but the numbers are already F - so, yay, I get massive wonkiness!

I go back into HA (fire it up again) and change the units system from imperial to metric and, next sensor report cycle, the values are back to being sent in as C. What the ever loving hell? Let's dig into the code a bit.

In the nodes there is this bit:

// Fetch and round temperature to one decimal
   float temperature = static_cast<float>(static_cast<int>((getControllerConfig().isMetric?sensors.getTempCByIndex(i):sensors.getTempFByIndex(i)) * 10.)) / 10.;

Okay, so it asks the controller what it should report in.

• But, why did this change with the HA settings change?

• If HA was just listening on the MQTT topic what the hell is it doing communicating back to the node to tell it use imperial? Can I turn this off and have HA report the correct value (in C) and unit (convert to F)?

• If Domoticz is just listening on the the MQTT topic why is it not telling the gateway to use imperial?

I am very confused by this. If I decide to have my nodes report in F how the hell is Domoticz going to handle that? Do I then have to change Domoticz settings to C to get the real number but have incorrect units assigned?

I really don't think the HA settings - unit change should have any impact whatsoever on the actual number sent from a node. It is purely presentation layer not data layer. There should be a method to tell HA that "values sent are in metric" and if the front end unit is set to imperial it should convert the raw number on HA's side - not change the settings on the gateway.

@stkilda It really depends on how much "control" you want. I run mosquitto broker, node-red (for handling lots of MQTT messages and for internet API calls), and for my controller I use Domoticz. All of this on my raspberry pi 2 B. I have around 1% CPU usage and ~25% RAM usage. There is not a lot of cross-traffic on my system (meaning I only send data to Domoticz from nodes and not the other way around). This works just fine. You can do the same on your laptop given any OS you want to use - your install and config will of course be different. Yes, you need to have your controller on all the time.

Domoticz is the easiest to get up and running. All you need is an ethernet/serial gateway and off you go. I use the MQTT gateway and Domoticz requires its own MQTT topic (lame) but that is easy to setup on node-red (I just rebroadcast my MQTT gateway messages on a the Domoticz topic).

@chisight I had done the raw file import. Issue I was facing was with the single/double quotes being interchanged. Easy fix. I am not sure if my "fix" for the VString was necessary. I just wanted to see what each sensor value was going to return. I need to get my DB setup a little better (using SQL Server as I cant stand the rigidness of time-series DBs like Influx).

A little clean up in notepad++ and I have a working flow!
I made some modifcations (of course) for my setup. The main one is the ability to get the sensor value type. Initially the code in the Parse node did:

// msg.topic = context.global.MYS.TOPIC_PREFIX + '/' + msg.controller + ' / ' + msg.nodeId + ' / ' + msg.childSensorId + ' / ' + msg.subTypeString;


 var tokens = msg.topic.split('/');
 
 msg.rawData = tokens;
 if(tokens.length >= 5)
 {
 msg.controller = parseInt(tokens[1]);
 msg.nodeId = parseInt(tokens[2]);
 msg.childSensorId = parseInt(tokens[3]);
 msg.subTypeString = tokens[4];
 msg.subType = context.global.MYS.VNum(msg.subTypeString);
 msg.command = 1; // SET
 msg.acknowledge = 0; // no ack as default
 }

return msg;

I modified the msg.subType to use:

msg.subType = context.global.MYS.VString(msg.subTypeString);

Now to set this up to write to my DB.
Many thanks to @FotoFieber and @chisight

@chisight I attempted to use this code but node-red would not let me import. Checked the json online and it does not appear to be valid.