My phone can see the Ble module in the bluetooth section (although it can't connect to it, it says it needs an app to do that) and I can connect to it via the BLE scanner app. but when I open the app, nothing shows up.
My phone can see the Ble module in the bluetooth section (although it can't connect to it, it says it needs an app to do that) and I can connect to it via the BLE scanner app. but when I open the app, nothing shows up.
The first link is about configuring Bluetooth, not communicating with an app. The wiring therein should be OK though. You only need power to Bluetooth in order for phone to see or connect, Seeing does not mean the serial wiring is kosher, so check it again - Tx>Rx and Rx<Tx. A phone that is not BLE compatible can still see a BLE device. Ditch the app inventor stuff and download a terminal app that is is specifically for BLE.