ELET114A Bluetooth Module

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The ELET114A Bluetooth module follows the BT2.1+EDR/3.0/4.0 Bluetooth profile and supports SPP, HID and so on. This module integrates the MCU and Bluetooth chip, thus boasts being high integrated, low consumption, and excellent Bluetooth radio frequency.


Bluetooth Specification: V2.1+ EDR, BT3.0, BT4.0 (BLE)
Operating Frequency Band: 2.4 -2.48GHz unlicensed ISM band
Main Digital Interface: UART
RX Sensitivity: -88dBm
Operating Voltage: +5V 20mA
Operating Temperature: -30 ~ +85 ℃
Dimensions: 50 x 24 x 2mm

Pin Descriptions

VCC: Positive pole of the power source
GND: Ground
TXD: Serial interface, transmitting terminal
RXD: Serial interface, receiving terminal

Using SunFounder Uno

Step 1: Compile and upload the code before building the circuit.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(7, 8); // RX, TX  
// Connect HM10      Arduino Uno
//     TXD          Pin 8
//     RXD          Pin 7

void setup() {  
  // If the baudrate of the HM-10 module has been updated,
  // you may need to change 9600 by another value
  // Once you have found the correct baudrate,
  // you can update it using AT+BAUDx command 
  // e.g. AT+BAUD0 for 9600 bauds

void loop() {  
  char c;
  if (Serial.available()) {
    c = Serial.read();
  if (mySerial.available()) {
    c = mySerial.read();

Step 2: Connect the circuit.

Bluetooth 4.0 Uno Board
TXD Pin 8
RXD Pin 7


Using Android

If you are using an Android phone, please follow the steps below:
Step 3: You need to download a Bluetooth 4.0 debugging assistant onto the mobile phone to connect it with the Bluetooth 4.0 module. We've provided the tool in Android. Just download BlueTooth.zip on your smart phone and decompress. Then you can see a file BlueTooth. Enable Bluetooth on your phone and install it.


Step 4: Open the installed app. It will directly go to the Bluetooth pairing interface. So first pair your phone and the module.


Step 5: After the pairing is done successfully, you'll be redirected back to the app homepage (Fig 1). Then tap Select Device at the top right corner. On the page, find the Bluetooth and hit it (Fig 2). Tap Connect. When Connect changes to Connected, it indicates that the pairing is good. At the same time the LED indicator on the module will change from blinking to constant lighting.

Select device.png

Step 6: Tap serial monitor in Arduino IDE, and type in “Hello!”, then you will receive it in the mobile phone. Similarly, SunFounder send by the phone will appear in the serial monitor.

Hello receive.png

Use iOS

If you are using an iPhone or MacBook, please follow the steps below (iPhone as an example):
Step 3: Go to the App store, search for the application – LightBlue and install.
Step 4: Click/Hit Settings -> Bluetooth, enable the Bluetooth and then open the LightBlue.


Step 5: If the Bluetooth is connected successfully, you will see ELET_BLE_XXXXXX as shown in Fig 4. Hit it to connect, then it redirects to the interface in Fig 5. Read and Write Page are separated.


Step 6: Read the message
Tap 0xFFE2 to enter into the interface in Fig 6, tap Hex in the top right corner to set the character type.
Among the types (Fig 7), choose UTF-8 String.


Hit Listen for notifications to read the value. Open Serial Monitor, select baud rate 115200, and send “Hello!”, then you will receive it in your iphone.

Step 7:Write the message
Tap 0xFFE3, and then tap Hex in the top right corner to set the character type.
Among the types (Fig 9), choose UTF-8 String. Hit Write New Value to write a message.


Then you can see the message sent from the phone in Serial Monitor.


Testing by AT Command

Step 1. Build the circuit.

Bluetooth Module FTDI


Step 2. Set parameters.
Run the serial debugging tool sscom32. Set the parameters first.
1) Run Open Com to check the COM port. Select the corresponding COM port as shown below.

Open sscom.png

2) Select the correct baud rate. Here we select 115200bps as shown below.


3) Before sending the command, tick the SendNew checkbox, then input “AT+MAC?” below Data input. If the Bluetooth module works normally, it will return the module’s address as shown below.


4) For more directives, please check the Datasheet of ELET114A.




ELET114A_Datasheet PDF.jpg