# BLE only displays Undefined **URL:** \ **Category:** Questions about Thunkable X\ **Created:** [February 27, 2020, 1:32pm UTC](https://community.thunkable.com/t/ble-only-displays-undefined/487534 "2020-02-27T13:32:20Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![jonybresc](https://avatars.discourse-cdn.com/v4/letter/j/dec6dc/32.png) [@jonybresc](https://community.thunkable.com/u/jonybresc)\ **Post date:** [February 27, 2020, 1:32pm UTC](https://community.thunkable.com/t/ble-only-displays-undefined/487534/1 "2020-02-27T13:32:20Z")
Hi, I am trying to create an app that will display data transfered from the arduino over bluetooth. I am using a H3 bluetooth chip connected to an arduino uno using pins TX and RX (1, 0). Everything works fine except the data sent from the arduino IDE will not display on the app. It reads undefined. Images attacted incluse arduino code, screen1 where the ble connects and screen 2 where I am trying to get the data displayed. Any help is much appreciated! Thanks, J ![Arduino](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/2/7/27ecf6119092ad46662f6aa2a06eddceba9b43c7.png) ![Screen 1](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/a/8/a8d70125c00d21bdc51f01868c656a1b650c16fc.png) ![Screen 2](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/b/4/b4ae42186d72a95082c1124191b5dc100c58f4b6.png) ---
**Author:** ![hhietala](https://avatars.discourse-cdn.com/v4/letter/h/9de053/32.png) [@hhietala](https://community.thunkable.com/u/hhietala)\ **Post date:** [March 23, 2020, 12:34pm UTC](https://community.thunkable.com/t/ble-only-displays-undefined/487534/2 "2020-03-23T12:34:27Z")
I would second this problem. I can also see the names of devices, and their MAC addresses, but a connection attempt results merely in the label turning into “undefined”. ---
**Author:** ![domhnallohanlon](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/domhnallohanlon/32/29554_2.png) [@domhnallohanlon](https://community.thunkable.com/u/domhnallohanlon)\ **Post date:** [March 29, 2020, 5:10pm UTC](https://community.thunkable.com/t/ble-only-displays-undefined/487534/3 "2020-03-29T17:10:55Z")
Thanks @hhietala can you share a screenshot of the blocks you’re using? Are you using the location sensor in your app too? ---
**Author:** ![hhietala](https://avatars.discourse-cdn.com/v4/letter/h/9de053/32.png) [@hhietala](https://community.thunkable.com/u/hhietala)\ **Post date:** [March 31, 2020, 4:33am UTC](https://community.thunkable.com/t/ble-only-displays-undefined/487534/4 "2020-03-31T04:33:53Z")
Hello! No, I am not using a location sensor. ![image](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/0/3/03aeaabf892785db186a941a46e286b3d98f9942.png) This is my set of blocks. ---
**Author:** ![pittsgsal](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/pittsgsal/32/50859_2.png) [@pittsgsal](https://community.thunkable.com/u/pittsgsal)\ **Post date:** [July 14, 2020, 9:13pm UTC](https://community.thunkable.com/t/ble-only-displays-undefined/487534/5 "2020-07-14T21:13:19Z")
Donhnall, After a lot of time spent trying to get the BLE to receive a reading from a device, and show that string OR data array output in a Text label; it just isn’t working, or I’m just not smart enough to figure it out… I’ve read everything here, and it just doesn’t work, unless you know something that everyone doesn’t… I LOVE Thunkable, and I really want to use it, but please teach me 2 things and I’ll be a happy person!.. - How to show the info from a BLE string or data array in a text label… - A way to convert HEX, Little Endian, etc… we need blocks to use. Thanks for creating!!! Mike (Thermo) ---
**Author:** ![deathmetalreaperd9x3](https://avatars.discourse-cdn.com/v4/letter/d/c2a13f/32.png) [@deathmetalreaperd9x3](https://community.thunkable.com/u/deathmetalreaperd9x3)\ **Post date:** [September 28, 2021, 12:41pm UTC](https://community.thunkable.com/t/ble-only-displays-undefined/487534/6 "2021-09-28T12:41:56Z")
Has anyone found a solution yet? ---
**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:** [November 8, 2024, 11:39am UTC](https://community.thunkable.com/t/ble-only-displays-undefined/487534/7 "2024-11-08T11:39:32Z")