- AJ SR04M ultrasonic sensor module for non-contact distance measurement in computer development projects. Suitable for hobbyists, engineers, and students. - Key benefits: precise range sensing from about 2 to 400 cm with a simple 4 pin interface; operates at 5V; provides a real time Echo pulse after triggering the Trig input; straightforward integration with common microcontrollers. - Compatibility and integration: works with Arduino and other microcontroller platforms; Raspberry Pi can be used with level shifting for 5V logic; compact package fits in small projects and enclosures. - Physical attributes: compact PCB design, standard header pins, robust transducer assembly; small footprint and easy to mount in tight spaces. - Practical applications: obstacle detection for small robots or autonomous prototypes; proximity sensing or distance measurement in automation experiments; educational demos to illustrate ultrasonic sensing principles.