Interfacing SPP-C Bluetooth to Serial Adapter Module with Arduino

Bluetooth modules are a type of wireless communication modules that can be added to a project as through serial or SPI communication protocols.

The advantage of using Bluetooth modules is that they are easy to set up and use.

The SPP-C module uses serial protocol for communication.

Note

All Bluetooth modules that use serial communication protocol , support AT Commands, which are listed in the datasheet of each product.

Download the datasheet of SPP-C module here.

SPP-C Bluetooth Module Datasheet

SPP-C Bluetooth Serial Module Pinout

This module has 6 pins:

• VIN: Module power supply – 3.6-6V
• GND: Ground
• STATE: Connection State
• EN: Enable AT Command settings
• RX: Receive Serial Data
• TX: Transmit Serial Data

You can see the pinout of this module here.

Required Material

Hardware component

Software Apps

Interfacing SPP-C Bluetooth Serial Module with Arduino

Step 1: Circuit

The following circuit shows how you should connect Arduino to SPP-C module. Connect wires accordingly.

Step 2: Library

Install the following library on your Arduino IDE.

Tip

If you need more help with installing a library on Arduino, read this tutorial: How to Install an Arduino Library

Step 3: Code

Upload the following code to the Arduino board.

 /* Modified on March 09, 2021 Modified by MohammedDamirchi from https://github.com/PaulStoffregen/SoftwareSerial 
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 */ #include SoftwareSerial mySerial(10, 11); // RX, TX void setup() < // Open serial communications and wait for port to open: Serial.begin(9600); while (!Serial) < ; // wait for serial port to connect. Needed for native USB port only >// set the data rate for the SoftwareSerial port mySerial.begin(9600); > void loop() < // run over and over if (mySerial.available()) < Serial.write(mySerial.read()); >if (Serial.available())

This code is to test the connection between the Arduino serial monitor and the device connected to the Bluetooth module.