Reliable distance-measurement module designed for stable performance and easy integration. Key benefits Accurate, stable measurements: Module design maintains measurement accuracy and reduces variance, giving reliable results for development and end applications. Straightforward integration: Fully compatible with the GH-311 anti-theft module, making it easy to add distance sensing to existing security or monitoring systems. Ready-to-use reference code: Provides program references for three MCUs (C51, PIC18F877, and Yilong microcontroller), so developers can start quickly without writing low-level drivers. Flexible display and output options: Includes reference programs for multiple display modes — ultrasonic LCD1602, ultrasonic LCD12864, digital tube display, and serial port output — plus a complete set of distance-measurement example programs to match different project needs. What it does Measures distance reliably and supplies measured values to a variety of display or control interfaces. Supports development and testing with full example code, reducing integration time and debugging effort. Compatibility and performance Compatibility: Fully compatible with GH-311 anti-theft module and supports MCU program references for C51, PIC18F877, and Yilong microcontroller. Performance: Designed for stable distance readings and consistent output across supported display modes and microcontrollers. Included program examples Basic distance measurement program Ultrasonic LCD1602 display program Ultrasonic LCD12864 display program Digital tube display program Serial port (serial display) program Complete set of distance-measurement reference programs for different display and application needs Practical use scenarios Robotics and automation: Obstacle detection and range sensing for mobile robots or automated guided vehicles, using provided MCU examples for fast integration. Security and monitoring: Integrate with the GH-311 anti-theft module to add proximity or perimeter detection to alarm systems. Prototyping and instrumentation: Rapidly prototype measurement displays (LCD1602, LCD12864, digital tube, or serial output) using ready-made reference programs. Why choose this module Reduces development time with ready reference code for multiple MCUs and display types. Simplifies integration into security systems thanks to full compatibility with GH-311. Delivers consistent, reliable distance readings suitable for a range of practical applications.