※ Characteristic - Bluetooth 2.0 / Bluetooth 4.0 BLE connection : HC-05, HC-06, HM-10, AT-09, BT05 (Android version 10 or lower) - Connect wifi AP and control arduino (Android version 8 or lower) - 12 digital buttons: toggle and push button property setting - 3 analog controllers: Min and Max value setting - Text input - Main screen display setting - Button label customization - Changed label and setting value saving function (internal DB) - Label external file storage function: /arduino_BT_button_label.txt※ Configuration - Main screen - Display setting screen - Button property setting screen※ blog https://nxpop.tistory.com/2* The Aduino code can be downloaded from the blog.