DSD TECH HM-20 Bluetooth 5.3 BLE Module User Manual

1. Konec produktuview

The DSD TECH HM-20 is an advanced Bluetooth Low Energy (BLE) module designed for seamless wireless communication. It serves as an upgraded version of the HM-10, incorporating the Texas Instruments (TI) CC2340 chip as its core component. This module supports Bluetooth 5.3 protocol, offering enhanced data transfer rates and a larger Maximum Transmission Unit (MTU) compared to its predecessors.

The HM-20 module is compatible with both iOS (iPhone) and Android (version 5.0 or later) mobile devices, facilitating integration into various projects requiring mobile connectivity. It is not designed for direct use with PC or MAC systems.

Image 1.1: DSD TECH HM-20 Bluetooth 5.3 BLE Module in its clear protective casing.

2. Technické specifikace

Below are the detailed technical specifications for the DSD TECH HM-20 module:

Image 2.1: Comparison of DSD TECH Bluetooth Module Series.

3. Nastavení a instalace

3.1 Module Pinout

The HM-20 module features four essential pins for connection:

• VCC: Power supply input (3.6V to 6V).
• GND: Zemní spojení.
• TX: Transmit data output (3.3V TTL logic level).
• RX: Receive data input (3.3V TTL logic level).

3.2 Schéma připojení

When connecting the HM-20 module to a microcontroller unit (MCU) like Arduino, ensure proper voltage levels for the TX and RX pins. The HM-20 operates at 3.3V TTL logic. If your MCU operates at 5V logic, a voltage divider or level shifter is required for the RX pin of the HM-20 to prevent damage.

Obrázek 3.1: Příkladample connection diagram for the HM-20 module to an Arduino/MCU, illustrating the use of a voltage divider for the RX pin when connecting to a 5V logic system.

4. Návod k obsluze

4.1 Příkazy AT

The HM-20 module supports AT commands for configuration. These commands are largely compatible with the AT commands used by the HM-10 module, with the exception of baud rate settings. Refer to the specific AT command documentation for detailed usage and available commands to configure parameters such as module name, password, and operating mode.

4.2 Používání mobilních aplikací

DSD TECH provides a free mobile application to facilitate quick integration and testing of the HM-20 module with your projects. This application is available for both Android and iOS devices.

• Pro Android: Hledat "DSD TECH Bluetooth" in the Google Play Store.
• Pro iOS: Hledat "DSD TECH Bluetooth" in the App Store.

The application allows you to scan for available Bluetooth devices, connect to your HM-20 module, and interact with it, for example, by sending and receiving data or controlling digital outputs if configured.

Image 4.1: DSD TECH Bluetooth App - Device Scan Interface.

Image 4.2: DSD TECH Bluetooth App - Control Interface Example.

5. Důležitá opatření

• The Bluetooth 5.3 BLE module is not compatible with any Bluetooth 2.0 SPP (Serial Port Profile) devices. Ensure your connecting device supports BLE.
• Vždy si ověřte objemtage levels when connecting the module to external hardware. The HM-20 operates with 3.3V TTL logic for its TX/RX pins. Connecting directly to 5V logic without a level shifter can damage the module.
• S modulem manipulujte opatrně, abyste předešli poškození elektrostatickým výbojem (ESD).

6. Řešení problémů

If you encounter issues with your DSD TECH HM-20 module, consider the following troubleshooting steps:

• Bez napájení: Verify that the VCC and GND connections are correct and that the power supply is within the specified range (3.6V to 6V).
• Žádné připojení: Ensure the module is powered on and discoverable. Check that your mobile device's Bluetooth is enabled and that you are using the correct DSD TECH Bluetooth application.
• Chyby komunikace: Double-check your TX/RX wiring. Confirm that the logic levels are compatible (3.3V TTL) and that any necessary voltage dividers or level shifters are correctly implemented. Ensure the baud rate settings in your MCU code match the module's configuration (if modified via AT commands).
• Problémy s aplikací: If the mobile application is not functioning as expected, try restarting the app or your mobile device. Ensure the app is updated to the latest version.

7. Péče a údržba

The DSD TECH HM-20 module is a robust electronic component, but proper care ensures its longevity and reliable operation:

• Uchovávejte modul v suchém prostředí, mimo dosah vlhkosti a extrémních teplot.
• Avoid exposing the module to strong electromagnetic fields.
• Do not attempt to open the module's casing unless necessary for specific project requirements, as this may expose sensitive components.
• Clean the module gently with a dry, soft cloth if dust accumulates. Avoid using liquid cleaners.

8. Záruka a technická podpora

DSD TECH is committed to providing comprehensive support for its products:

• Technická podpora: DSD TECH offers permanent technical support for the HM-20 Bluetooth 5.3 BLE Module. All technical inquiries will be addressed within one working day.
• Výměna produktu: A 1-year product replacement service is provided for this module, covering manufacturing defects or malfunctions under normal use.

For technical assistance or warranty claims, please refer to the contact information provided with your purchase or visit the official DSD TECH webmísto.