Honeywell Dimmer switch dim level—how to set it to 15%?

[JDRoberts]

IFTTT is very limited, it’s just intended for simple integrations. You can do much more with smartthings without IFTTT.

See the following FAQ (the topic title is a clickable link)

How to Get Started Creating Complex Rules in SmartThings

(This is a wiki post: feel free to edit it or add to it as needed. Also, I can’t take any screenshots since I can’t use the app at this time due to its incompatibility with voiceover, so feel free to add screenshots where they would be helpful.) At one point, one of the biggest advantages of using the SmartThings platform was the wide variety of devices that it supported. However, by the end of 2017 several competing platforms had caught up in that regard. Where SmartThings still holds a significant advantage over some of the other low-cost home automation solutions is in the ability to really build really complex rules in a fairly simple manner. You won’t have to be a programmer, but you may need the help of other community members to get the logic constructed just right. Also, you …

All of that said, before we go any farther, did you look to see if using a scene will let you set it to 15%? Scenes work differently in the new app and the classic app, and since neither is voice navigable at this time I’m not up-to-date on all the details. But if you can set it to 15% with a scene, then you could just activate the scene.

Otherwise, take a look at the options in the FAQ.