I am trying to connect to an HC-05 but it just does nothing when i try to connect

[uskiara]

On Arduino side you send the string "1" (and not a number), therefore you'd better receive a text with the appropriate blocks on AI2 side.
Please refer to @ABG 's FAQ on the matter, here:

FAQ Section: BlueTooth

Simple text receiver example BlueTooth Pairing and Discovery Extension ($) - vknow360 Bluetooth error codes Documentation for the BluetootClient component (for BT<4) can be found here: http://ai2.appinventor.mit.edu/reference/components/connectivity.html#BluetoothClient MIT provides an extension to use the Bluetooth Low Energy (BLE). Since June 19, 2017 the support for BLE has been greatly expanded and improved. A starting point for finding documentation, tutorials and more is the: App Inven…