This article is a technical synthesis based on publicly available AJ-SR04M datasheets and community reverse-engineering. Always consult the original manufacturer datasheet for absolute electrical characteristics.
This article consolidates and extrapolates all critical information found in the official AJ-SR04M datasheet, including pinouts, electrical characteristics, timing diagrams, communication protocols (serial vs. one-wire), and practical application advice. Aj Sr04m Datasheet
If your project lives indoors on a workbench, use HC-SR04. If it will face water, dust, or long cable runs, the AJ-SR04M is the correct choice. This article is a technical synthesis based on
The AJ-Sr04m is designed for surface mounting. The module can be soldered using a standard reflow soldering process. The recommended soldering temperature is 250°C for 10 seconds. communication protocols (serial vs. one-wire)