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Wi-Fi Module Interface Types (UART / SDIO / USB / SPI)

1. UART (Universal Asynchronous Receiver-Transmitter)

  • Overview: A widely used serial communication interface with simple hardware requirements.
  • Advantages: Low cost, easy to implement, and suitable for basic Wi-Fi control and data transmission.
  • Limitations: Low data rate (typically up to 1 Mbps), not ideal for high-speed video or real-time preview.

2. SDIO (Secure Digital Input Output)

  • Overview: A high-speed serial interface commonly used in mobile and embedded systems.
  • Widely used in mid-to-high-end body cameras for real-time video streaming and high-speed uploads.
  • Advantages: Higher bandwidth than UART, low latency, efficient for embedded systems.
  • Limitations: Requires OS-level driver integration, slightly more complex development.

3. USB (Universal Serial Bus)

  • Overview: A high-bandwidth interface, plug-and-play support.
  • Often used in Android-based body cameras or where modular replaceable Wi-Fi modules are adopted.
  • Advantages: High throughput (especially with USB 2.0/3.0), supports large data transmission such as HD video.
  • Limitations: Higher power consumption, larger physical size.

4. SPI (Serial Peripheral Interface)

Limitations: Limited throughput, not ideal for large video data.

Overview: A lightweight synchronous interface for close-range, fast communication.

Rarely used in body cameras, more common in ultra-compact or MCU-based IoT devices.

Advantages: Low power, low latency, relatively fast for small data packets.