AJ-SR04M V3.0 Waterproof Ultrasonic Distance Sensor – JSN-SR04T Upgraded Module for Arduino & ESP32

Overview 

The AJ-SR04M V3.0 is an upgraded waterproof ultrasonic rangefinder module. It consists of an integrated ultrasonic probe (sealed in a metal housing) and a separate control circuit. Unlike the standard JSN-SR04T, the V3.0 is more stable, has a smaller “blind zone” (minimum distance), and supports multiple output modes. Whether you are building an automated irrigation system or a car parking sensor, this module ensures reliability even in rain, dust, or humid conditions.

Key Features 

• Waterproof Probe: The sensor head is fully sealed, making it suitable for wet and dusty environments (the control board must be kept dry).

• Wide Range: Accurate distance measurement from 20cm up to 450cm.

• High Precision: Offers millimeter-level resolution with minimal interference.

• V3.0 Stability: Improved signal processing reduces “jitter” compared to older V1.0 or V2.0 modules.

• Standard Interface: Uses the same Trigger/Echo pins as the HC-SR04, making it 100% code-compatible.

Technical Specifications