AT-09 BLE Bluetooth 4.0 UART Module CC2541 Central Switching Compatible with HM-10

Description

What it is

The AT-09 BLE Bluetooth 4.0 module is a UART transceiver based on the CC2541 platform, designed for wireless communication in various types of applications and projects.

Features

• Compatible with HM-10
• Bluetooth 4.0 Transceiver
• UART Communication

What it is for

The AT-09 BLE modules are useful for connecting Arduino devices and other systems to smartphones or tablets, making it possible to create IoT projects such as remote monitoring or a home alarm system that sends Bluetooth notifications when a door or window is opened.

Tutorial: How to use the AT-09 BLE Bluetooth module

The AT-09 BLE Bluetooth module is ideal for connecting Arduino devices to smartphones or tablets. It is particularly useful for IoT and remote monitoring projects.

What you need

• Arduino Uno
• AT-09 BLE Module
• USB cable for Arduino
• 3V battery (optional)
• Wi-Fi or mobile data connection

Steps

1. Connect the AT-09 BLE module to a TX and RX pin of the Arduino.
2. Insert the example script provided into the Arduino IDE.
3. Compile and upload the sketch to the Arduino.
4. Open the serial monitor to view messages from the AT-09 BLE module.
5. Install an app like ‘BlueTerm’ on a smartphone or tablet to connect to the module.
6. Send commands from Arduino to Bluetooth and vice versa.
7. Verify that the device connects correctly and exchanges data.
8. Test the central switch functionality with the app.

Example code

void setup() {
  Serial.begin(9600);
}

void loop() {
  if (Serial.available()) {
    String msg = Serial.readStringUntil('n');
    // Inviare messaggio al modulo AT-09 BLE
    Serial.print(msg);
  }
}

Mini project

Create a home alarm system that sends Bluetooth notifications when a door or window is opened.

Common mistakes

• Error in the baud rate configuration between Arduino and the AT-09 BLE module.
• Connection issues due to radio interference.
• Difficulty interpreting data received from the serial console.
• Missing password or PIN code to establish a secure connection.

Recommended accessories

• JST-XH connector
• External Bluetooth Antenna
• Motion sensors compatible with Arduino
• LCD or OLED Display

Frequently asked questions

What is the maximum connection distance?
Check the module’s datasheet.

Can it be powered by batteries?
Yes, but check the power consumption and battery life.