1. สินค้าหมดview
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. ข้อมูลจำเพาะทางเทคนิค
Below are the detailed technical specifications for the DSD TECH HM-20 module:
| ข้อมูลจำเพาะ | ค่า |
|---|---|
| แบบอย่าง | HM-20 |
| เล่มงานtagอี (VCC) | 3.6V ถึง 6V |
| TTL Logic Level (TX, RX) | 3.3โวลต์ |
| โปรโตคอลบลูทูธ | 5.3 BLE |
| ชิป | ทีไอ ซีซี 2340 |
| การกำหนดค่า PIN | VCC, GND, TX, RX |
| รองรับ iOS | ใช่ |
| รองรับ Android | 5.0 ขึ้นไป |
| Support PC or MAC | เลขที่ |
| น้ำหนักสินค้า | 0.236 ออนซ์ |
| ขนาดสินค้า | 1.97 x 0.79 x 0.31 นิ้ว |
Image 2.1: Comparison of DSD TECH Bluetooth Module Series.
3. การตั้งค่าและการติดตั้ง
3.1 โมดูลพินเอาท์
The HM-20 module features four essential pins for connection:
- วีซีซี: Power supply input (3.6V to 6V).
- จีเอ็นดี: การเชื่อมต่อกราวด์
- เท็กซัส: Transmit data output (3.3V TTL logic level).
- อาร์เอ็กซ์: Receive data input (3.3V TTL logic level).
3.2 แผนภาพการเชื่อมต่อ
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.
ภาพที่ 3.1: อดีตample 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. คู่มือการใช้งาน
4.1 คำสั่ง 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 การใช้งานแอปพลิเคชันบนมือถือ
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.
- สำหรับ Android: ค้นหา "DSD TECH Bluetooth" in the Google Play Store.
- สำหรับ iOS: ค้นหา "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 Exampเล.
5. ข้อควรระวังที่สำคัญ
- 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.
- ตรวจสอบปริมาตรเสมอtage 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 การแก้ไขปัญหา
If you encounter issues with your DSD TECH HM-20 module, consider the following troubleshooting steps:
- ไม่มีไฟฟ้า: Verify that the VCC and GND connections are correct and that the power supply is within the specified range (3.6V to 6V).
- ไม่มีการเชื่อมต่อ: 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.
- ข้อผิดพลาดในการสื่อสาร: 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).
- ปัญหาเกี่ยวกับแอป: 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. การดูแลรักษา
The DSD TECH HM-20 module is a robust electronic component, but proper care ensures its longevity and reliable operation:
- เก็บโมดูลไว้ในสภาพแวดล้อมที่แห้ง ห่างไกลจากความชื้นและอุณหภูมิที่สูงหรือต่ำมาก
- 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. การรับประกันและการสนับสนุนทางเทคนิค
DSD TECH is committed to providing comprehensive support for its products:
- การสนับสนุนด้านเทคนิค: 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.
- การเปลี่ยนผลิตภัณฑ์: 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 webเว็บไซต์.