There are quite a few Arduino project reports in the forms, although many of them depend on the thingshield device which is no longer being sold. But there are a number of other alternatives you can consider.
You can take a look at the quick browse lists in the community – created wiki and look at the project reports for sensors and “impress your friends” and you may find a lot of inspiration There.
http://thingsthataresmart.wiki/index.php?title=How_to_Quick_Browse_the_Community-Created_SmartApps_Forum_Section#Quick_Browse_Links_for_Project_Reports.2FQuestions
For discussion with other makers and the possibilities for connecting an Arduino to smartthings without using thingshield, see the following thread:
Some people in the community have used particle in the past:
Particle has just announced an open beta for raspberry pi which might substitute for some of these use cases.
But the hardware other than the pi is more expensive and you’re going cloud to cloud so it’s not going to work for all these cases.
https://www.particle.io/products/development-tools/raspberry-pi-on-particle
And this in particular is a brand-new project for using an ESP8266 Wi-Fi radio with SmartThings:
UPDATE 2022-08-17 - Per this recent SmartThings announcement, the Groovy IDE will disabled on September 30, 2022 . My best guess is that any existing ST_Anything devices will probably cease to operate at this time, or shortly thereafter. It has been a good 7+ year run for ST_Anything users. I want to thank you all for making ST_Anything a successful project! My son and I really had a lot of fun creating it together, and have enjoyed hearing how you have all used it in so many creative ways.
As many of you probably already know, I have moved on from ST and have ported ST_Anything over to Hubitat as “HubDuino” . If you have devices running ST_Anything that you ‘can’t live without,’ at least you know you have options. Another option for ESP8266/ESP32 users would be to use ESPHome along …
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