Is it possible to integrate a DIY device that has its own settings like flashing a led or turning on light with certain rules already built in?
If so when it integrates can certain rules be stacked and not collide with a rule for a motion sensor that may be triggered at the same time?
It all depends on how you communicate between them.
I have Arduino code running on ESP devices that host a webpage that accepts commands that I send from a custom Hubitat driver I wrote.
Depends on the device. For Arduino devices, look at @ogiewon's Hubduino integration.
Depends on how you write your rules. But yes, in general this is possible.
This is something I can work with, but at the moment it seems time is needed to research hubduino. Being through spotlighting a few terms in the hubuino link it is clear that no other boards eg; Mega, Nano etc have yet to be implemented as the main connection. So is it possible to interace from a mega then ESP or does it have to originate from the ESP as the main board?
Hopefully tomorrow there will be some off these in hand to start the process.
Editting note. Its been a few years since hubduino was first released. Gosh this is going to be fun if I can get the stuff im imagining to work. It will be a few days before the hubitat comes in.
Thanks for your feedback also!
HubDuino supports many hardware configurations, as listed in its ReadMe on GitHub.
Turn your Arduino UNO/MEGA/MKR1000/MKR1010/NANO33IoT, ESP8266, or ESP32 into Anything you can imagine! HubDuino/ST_Anything is an Arduino library, sketch, and Device Handlers that works with your hardware to create an all-in-one SmartThings device.
Hope this helps explain it a little more.
These days, the simplest solution is to use an ESP8266 or ESP32 based microcontroller. Both are very robust and reliable.
I have the Nano 33 IOT already, Just trying to figure out if the latest Hubitat is required as well or would a version 7 or earlier suffice?
Any version of Hubitat will suffice. But you might find the responsiveness to be substantially better with the latest version (C-8 Pro).
If you have any questions or issues with the Nano 33 IOT, let me know. I can pull mine out of the drawer, dust it off, and make sure everything still behaves as expected. It has been a few years since I have fired that little board up! 
A lot of things have changed with the Arduino IDE during those years.
Went with the C8-Pro and have plethora of implantation that will need to be worked on for automations.
Finally got around to getting this setup. Had to switch to powering everything from Solar. So building that setup took so much time. Everything from battery cabinets to enclosures for the models etc. Its been a long road and now will tinker with this. Just installed Hubduino and have a few different types of ESP32's. My main hope is to follow a diagram and post on the arduino forum that has been closed but some of the code was posted on an image. Just need to sort out the spacing for the code to be written correctly and to figure out if one stacks on top of the other and vice versa.
Any update on your progress? I have been using Arudino and Hubitai for a few years but not together. But now that the summer is over and I have the time I'm looking to do some DIY projects where the Hubitat talks with my Arduino projects.
Maybe this will be helpful. I have been tinkering with a DIY Arduino/ESP8266/NodeMCU solution to provide a visual alert for my garage door status that I could integrate into my Hubitat set up. What started out as a hobby project totally for my own learning and enjoyment sort of snowballed. Now, after spending so many hours on researching, designing, and testing the hardware, firmware and driver I decided to go “all in” on documenting and sharing as my first-ever open source project through GitHub and Hackster.IO. Since I was the beneficiary of ideas and knowledge that so many others have shared with the use community, my sole intent here is to give back and hope that someone else might benefit in turn. I dubbed my project the “General-Purpose WiFi-connected Indicator Device (GWID)”
On Hackster.IO - General-Purpose WiFi-connected Indicator Device (GWID) - Hackster.io
On GitHub - GitHub - tdspublic/GWID: General-purpose WiFi-connected Indicator Device
(This is my first post to the Hubitat community forum, so I hope this is right place topically. Advice and mentoring welcome...)
Download the Hubitat app
