1. 제품 오버view
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. 기술 사양
Below are the detailed technical specifications for the DSD TECH HM-20 module:
| 사양 | 값 |
|---|---|
| 모델 | HM-20 |
| 작업 볼륨tag전자(VCC) | 3.6V ~ 6V |
| TTL Logic Level (TX, RX) | 3.3V |
| 블루투스 프로토콜 | 5.3 BLE |
| 칩 | 티에이치씨씨2340 |
| PIN 구성 | VCC, GND, TX, RX |
| iOS 지원 | 예 |
| Support Android | 5.0 이상 |
| Support PC or MAC | 아니요 |
| 품목 무게 | 0.236 온스 |
| 제품 치수 | 1.97 x 0.79 x 0.31 인치 |
Image 2.1: Comparison of DSD TECH Bluetooth Module Series.
3. 설정 및 설치
3.1 Module Pinout
The HM-20 module features four essential pins for connection:
- VCC: Power supply input (3.6V to 6V).
- GND : 접지 연결.
- TX : Transmit data output (3.3V TTL logic level).
- RX : Receive data input (3.3V TTL logic level).
3.2 결선도
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.
이미지 3.1: Example 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. 사용 설명서
4.1 AT 명령어
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 모바일 애플리케이션 사용
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.
- 안드로이드의 경우: 검색 "DSD TECH Bluetooth" in the Google Play Store.
- iOS의 경우: 검색 "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 Examp르.
5. 중요한 주의사항
- 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.
- 항상 볼륨을 확인하세요.tage 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.
- Handle the module with care to avoid electrostatic discharge (ESD) damage.
6. 문제 해결
If you encounter issues with your DSD TECH HM-20 module, consider the following troubleshooting steps:
- 전원 없음: Verify that the VCC and GND connections are correct and that the power supply is within the specified range (3.6V to 6V).
- 연결 없음: 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.
- 통신 오류: 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).
- 앱 문제: 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. 관리 및 유지 보수
The DSD TECH HM-20 module is a robust electronic component, but proper care ensures its longevity and reliable operation:
- 모듈을 건조한 환경에 보관하고, 습기와 극한의 온도를 피하세요.
- 모듈을 강한 전자기장에 노출시키지 마십시오.
- 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. 보증 및 기술 지원
DSD TECH is committed to providing comprehensive support for its products:
- 기술 지원: 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.
- 제품 교체: 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 web대지.