# No Bluetooth or Sensors in component list **URL:** \ **Category:** Questions about Thunkable X\ **Tags:** help\ **Created:** [June 29, 2021, 7:47am UTC](https://community.thunkable.com/t/no-bluetooth-or-sensors-in-component-list/1369450 "2021-06-29T07:47:34Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![stuartweightmano](https://avatars.discourse-cdn.com/v4/letter/s/dfb087/32.png) [@stuartweightmano](https://community.thunkable.com/u/stuartweightmano)\ **Post date:** [June 29, 2021, 7:47am UTC](https://community.thunkable.com/t/no-bluetooth-or-sensors-in-component-list/1369450/1 "2021-06-29T07:47:34Z")
Hi, I am a complete beginner with Thunkable. I have no Bluetooth or Sensors in component list to select? What do I have to do? Thanks ---
**Author:** ![muneer](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/muneer/32/75210_2.png) [@muneer](https://community.thunkable.com/u/muneer)\ **Post date:** [June 29, 2021, 7:51am UTC](https://community.thunkable.com/t/no-bluetooth-or-sensors-in-component-list/1369450/2 "2021-06-29T07:51:58Z")
Thunkable has 2 different designer platform, namely StP (Snap to Place, also called Legacy) UI and DnD (Drag and Drop) UI. In DnD all sensors and other `invisible` components are in the `blocks` screen not in the design screen. ---
**Author:** ![stuartweightmano](https://avatars.discourse-cdn.com/v4/letter/s/dfb087/32.png) [@stuartweightmano](https://community.thunkable.com/u/stuartweightmano)\ **Post date:** [June 29, 2021, 8:06am UTC](https://community.thunkable.com/t/no-bluetooth-or-sensors-in-component-list/1369450/3 "2021-06-29T08:06:59Z")
Thanks Muneer, just found them in the blocks screen as you said. But when I drag a scan block out and place it is greyed out? Any help would be appreciated ---
**Author:** ![jane](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/jane/32/27575_2.png) [@jane](https://community.thunkable.com/u/jane)\ **Post date:** [June 29, 2021, 8:11am UTC](https://community.thunkable.com/t/no-bluetooth-or-sensors-in-component-list/1369450/4 "2021-06-29T08:11:27Z")
Hi there, Did you connect the scan block to other blocks inside your project? If a block is greyed out, that means that it is not connected to other blocks, and it will never be executed in your project. ---
**Author:** ![stuartweightmano](https://avatars.discourse-cdn.com/v4/letter/s/dfb087/32.png) [@stuartweightmano](https://community.thunkable.com/u/stuartweightmano)\ **Post date:** [June 29, 2021, 8:14am UTC](https://community.thunkable.com/t/no-bluetooth-or-sensors-in-component-list/1369450/5 "2021-06-29T08:14:06Z")
Ahh, thanks Jane. That’s what I hadn’t done. Complete beginners error. Thanks. ---
**Author:** ![jane](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/jane/32/27575_2.png) [@jane](https://community.thunkable.com/u/jane)\ **Post date:** [July 1, 2021, 9:11am UTC](https://community.thunkable.com/t/no-bluetooth-or-sensors-in-component-list/1369450/6 "2021-07-01T09:11:29Z")
You only need to add one of each sensor. Once you have added a sensor, you will not be able to add another one. Let me know if you have any questions about re-using sensors in your project! ---
**Author:** ![ioannis](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/ioannis/32/146956_2.png) [@ioannis](https://community.thunkable.com/u/ioannis)\ **Post date:** [May 21, 2024, 10:37pm UTC](https://community.thunkable.com/t/no-bluetooth-or-sensors-in-component-list/1369450/8 "2024-05-21T22:37:58Z")
---
**Author:** ![ioannis](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/ioannis/32/146956_2.png) [@ioannis](https://community.thunkable.com/u/ioannis)\ **Post date:** [May 21, 2024, 10:39pm UTC](https://community.thunkable.com/t/no-bluetooth-or-sensors-in-component-list/1369450/9 "2024-05-21T22:39:13Z")
---
**Author:** ![ioannis](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/ioannis/32/146956_2.png) [@ioannis](https://community.thunkable.com/u/ioannis)\ **Post date:** [May 21, 2024, 10:39pm UTC](https://community.thunkable.com/t/no-bluetooth-or-sensors-in-component-list/1369450/10 "2024-05-21T22:39:35Z")