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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Distance sensing with ultrasonic sensor and Arduino.

Once connection is established, that red light will stay on constantly. For transmitting information through bluetooth module we will use the default SoftwareSerial library. It also provides some information on how to change the baud rate, device name and passkey, so make sure to check the data sheet. Once we turn on Arduino, a red light on Bluetooth module should be flashing continuously.


Simply connect the 4 pins to your Arduino board. If you open up SoftwareSerial constructor docsSoftwareSerial constructor is defined as such:.

It is already bundled with Arduino, so no further downloads are necessary. Wifeless two pins to drive the module, other than that the interface is exactly the same as serial communication to PC via USB. For Apple devices there should be something similar on the App store as well. The wiring is really straightforward, no extra components are needed.

Easy Arduino Bluetooth Communication with JY-MCU Bluetooth module

If you have an Android device, there is this Blue Serial app for testing serial communication over Bluetooth. If PC sends information via Serial, then we send that information over via Bluetooth.

Bluetooth Serial initialization works exactly the same way regular Serial communication works, we call begin method with the baud rate. Reading through the docs is, again, encouraged, as we will use very similar code to drive our JY-MCU module.

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: Here is the datasheet for the main module: Considering how ubiquitous Ardiuno is most smartphones and laptops have itit will turn out to be extremely ,cu in our future projects.


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

Last time we looked at measuring temperature using a digital temperature sensor. Measuring temperature with DS18B20 temperature sensor. HC serial wireless module.

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