Error 507: Unable to connect

[ChrisWard]

This Topic may help you, it has App Inventor code and an Ardunio Sketch. It drives a very simple Robot Arm:

Send a character via Bluetooth

Here is a template project that you can either change to suit your project or just take useful Blocks from it via the BackPack: BT_Basic_Setup_Send.aia (8.5 KB) Note that it uses a ListView instead of a ListPicker - does not matter which you use, chose the one that suits your GUI design best.

http://dcube.lk/d_cube_stem_gripper/