I connected the Bluetooth module’s rx to 11, tx to 10 and gn to gnd and vcc to 5v. The en pin was also HIGH (applying 3.3V) Then I powered up the arduino and also the Bluetooth module.

It uses a Bluetooth module such as the HC-05 to act as an messaging device to transmit and receive the data between the Arduino and Android. The app is simple to use and can be used for other purposes ...

This project demonstrates the complete construction of Arduino LCD using Bluetooth Module. Source code Included within the article.

An Arduino mini pro provides the brains. A FT-232 USB to serial board is used to program the Arduino. A standard Bluetooth module has to have HID firmware installed.

HiLetgo UNO R3 D1 R32 ESP32 ESP-32 CH340G WiFi Bluetooth UNO Development Board WiFi Bluetooth 4MB Flash with Micro USB for Arduino DX-BT27-A Bluetooth Module Long Range Up to 420m BLE Support ...

Lauterbach extends the range of Arduino supported boards and devices. After the successful integration of the »Pro Portenta H7«, Trace32 now also supports the Arduino »Nano 33 BLE« and »Nano 33 BLE ...

In Connecting to Intel® Edison from Android* with Bluetooth* LE (BLE) describes a way to access BT via Arduino code but additional BT shield/kit is required.