I’m wondering if it’s possible to use all my Hue devices like the Motion sensor, Tap switch and dimmer with Smartthings.
“Possible” is a complicated word with regard to the smartthings platform. 
If you are using the official integration, then the accessories like the sensors and switches are not visible to smartthings. You can still use them with your hue bridge as a parallel means of control, and many people do, but you can’t set up smartthings automations based on the accessory activity.
A few of the accessories could be added directly to the smartthings hub and used as generic zigbee devices, but then they wouldn’t also work with the hue bridge and you would lose some of the advanced features.
Custom Solutions
- Polling: not always reliable. If you are willing to use custom code, then you may be able to set up a situation where the accessories are visible to smartthings while still working with the hue bridge. This has worked for some community members, but isn’t always reliable. For information on that, see the following thread (The topic title is a clickable link)
- Just the motion sensor: works pretty well. There is also a custom DTH specifically to allow you to use a hue motion sensor, either indoors or outdoors, connected directly to the smartthings hub.
Hue Outdoor Motion & SmartThings Hub - #4 by harshw
3)Just the Hue Dimmer, in Beta
There is community created code for adding a huge dimmer directly to the smart things hub. Like the previous motion sensor code if you do it this way, it will be visible to smartthings but not to the hue app. See the following thread:
- Via HomeKit: works well but has a very complex setup and requires an additional server. If you use iOS devices, you can set up HomeKit, then use a separate server device with Homebridge, Then add your smartthings devices to homekit that way and then use everything together, but that’s a very complicated method. And it doesn’t bring your HomeKit devices into smartthings, it brings your smartthings devices into Homekit, so you have to setup at least some rules there to get interactions. You can talk to people using that method and get more details in the following thread:
- By proxy: Pretty simple to setup, reliable, but requires dedicating a hue bulb to each accessory. Another alternative that will work for some situations is simply to assign a hue (or ikea bulb attached to the hue bridge) to the accessory and then trigger your smartthings events off of that bulb changing. This is easy to setup. You use the hue app to create a rule so that the accessory controls the bulb. After that, smartthings will see the bulb going on or off and you can use the smartthings app or Webcore to create Automations to react to that. So the main issue is whether it makes sense in your use case to have that bulb going on and off. if you had, say, a zwave switch that you wanted to control with a hue dimmer, Adding a table lamp to the room with the hue bulb might work fine for you. If you wanted to use a hue tap to arm and disarm your security system, you could use a hue light strip as an indicator light. but there are other use cases where turning a light on and off might not make much sense. And of course there is an added dollar cost for the Hue proxy device. So most people would prefer one of the other methods above, but this one is doable for some situations.
So as you can see, the answer to your question is “it depends,“ depending on how much technical work you’re willing to do and what you’re willing to spend.
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Thank you for a very good and quick answer! That makes me lean more towards buying a Athom Homey. Only thing is that my Samsung dishwasher, fridge and oven might not be supported by Homey.
I gave to give it more thought:/
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