Follow these instructions for Windows or these instructions for Mac to get the ESP32 Arduino package installed.

Open the attached Arduino sketch ("ESP32_BLE_UART_Demo.ino") and make sure you choose the right board (Tools / Board) and COM port after plugging in your ESP32 board with the USB cable. Upload the sketch to the board and open serial monitor.

Install the attached APK file on an Android device by emailing it or otherwise transferring it to your device. If you want to edit the app, go to Thunkable, set up and account, and import the .aia file that I've also attached.

Press the top left button to connect to the ESP32 and once connected you should see values appear in the middle of the screen. You can then press the LED button to toggle the on-board LED on and off!

You can always add more features to the app and code to do some really cool things. Let me know if you come up with cool ideas or share them if you make it!

Check out a step-by-step tutorial in this Instructable but for a summary, please see the steps below: