The Bluetooth module we’ll be using is called JY-MCU Bluetooth Board Module ( 4-pin). Here is the datasheet for the main module: HC serial wireless module. Baud rate: ; Device name: linvor; Passkey: The JY-MCU Bluetooth Serial Port module defaults to or Step 1: Connect the JY-MCU module to the Arduino for configuration. Description: JY-MCU Bluetooth Wireless Serial Port Module for Arduino. This incredibly affordable module is compatible with any official Arduino board and can.

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If there is any data received by the bluetooth module, send it over the regular Serial connection to our PC.

Easy Arduino Bluetooth Communication with JY-MCU Bluetooth module

Once connection is established, that red light will stay on constantly. It also provides some information on how to change the baud rate, device blketooth and passkey, so make sure to check the data sheet.


Bluetooth Serial initialization works exactly the same way regular Serial communication works, we call begin method with the baud rate. Only two pins to drive the module, other than that the interface ardujno exactly the same as serial communication to PC via USB. If you open up SoftwareSerial constructor docsSoftwareSerial constructor is defined as such:.

So we have several modules generating data, would be great to be able to access that data remotely. Here I sent some information from my PC to the phone and vice versa: Once we turn on Arduino, a red light on Bluetooth module should be flashing continuously. Reading through the docs is, again, encouraged, as we will use very similar code to drive our JY-MCU module.

First we include the library and set our RX and TX pins.

If PC sends information via Serial, then we send that information over via Bluetooth. For transmitting information through the module we will use the default SoftwareSerial library.

Last time we looked at measuring temperature using a digital temperature sensor. Considering how ubiquitous Bluetooth is most smartphones and laptops have itit will turn out to be extremely useful in our future projects. Distance sensing with ultrasonic sensor and Arduino.


If you have an Android device, there is this Blue Serial app for testing serial communication over Bluetooth. HC serial wireless module.

Easy Arduino Bluetooth Communication with JY-MCU Bluetooth module

Simply connect the 4 pins to your Arduino board. For Apple devices there should be something similar on the App store as well.

Here is the datasheet for the main module: It is already bundled with Arduino, so no further downloads are necessary. The wiring is really straightforward, no extra components are needed. Measuring temperature with DS18B20 temperature sensor.

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