How To Interface Inbuilt Bluetooth of ESP32 Development Board With Arduino IDE?

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ESP32 board comes not only with Wi-Fi but also with classic Bluetooth and Bluetooth Low Energy (BLE). To interface the ESP32 development board with Arduino Uno, you can start with a simple application such as a temperature monitor using a 3-pin LM35 temperature sensor. The required software are Arduino IDE, Arduino code, and relevant libraries, including ‘OneWire’ for the temperature sensor and ‘Arduino-esp32-master’ for ESP32 board.

ESP32 module
Fig. 1: ESP32 module

OneWire can be downloaded from Sketch/Include Library in Arduino IDE. Arduino-esp32-master can be downloaded from the link.

Unzip Arduino-esp32-master.zip folder, copy and then paste BluetoothSerial folder under Arduino/Examples on your system. Open SerialToSerialBT from Arduino IDE, as shown in Figure below. Upload it to ESP32 board. This code establishes Bluetooth communication between ESP32 and your mobile phone.

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Now, install a Bluetooth application on your Android phone, such as Serial Bluetooth Terminal available on the Play Store. You can also write a simple Arduino code for data exchange with temperature sensor. For more details, you may refer to the tutorial given at the link.

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