JSN-SR04T / AJ-SR04M Waterproof Ultrasonic Distance Sensor | 20cm–600cm Ranging Module for Arduino, ESP32 & Smart Water Level Projects

Product Description

The JSN-SR04T / AJ-SR04M Waterproof Ultrasonic Distance Sensor Module is a high-performance waterproof ranging sensor designed for non-contact distance and level measurement in wet or harsh environments.

Using ultrasonic wave reflection technology, the sensor emits high-frequency sound waves and measures the time taken for the echo to return, providing accurate distance data from 20cm to 600cm.

The fully sealed transducer head makes it suitable for outdoor use, water level monitoring, and industrial automation. It interfaces easily with Arduino, ESP32, STM32, and Raspberry Pi through a standard 4-pin connection and outputs precise distance readings via pulse width signals.

Key Features

• Model: JSN-SR04T / AJ-SR04M

• Operating Voltage: 3.3V – 5V DC

• Measuring Range: 20cm – 600cm (waterproof)

• Effective Angle: < 15°

• Accuracy: ±1cm

• Working Frequency: 40kHz ultrasonic wave

• Interface Pins: VCC, Trig, Echo, GND

• Output Signal: TTL pulse (compatible with 3.3V/5V logic)

• Cable Length: ~2.5 meters (waterproof transducer)

• Sensor Type: Integrated ultrasonic transmitter and receiver

• Waterproof Rating: IP66 (sensor head)

• Power Consumption: Low current operation (~8mA typical)

• Compatibility: Arduino, Raspberry Pi, ESP32, STM32, AVR, PIC, and similar controllers

Advantages

• Fully waterproof ultrasonic sensor for outdoor and liquid-level applications.

• Long-distance range up to 6 meters with high precision.

• Resistant to humidity, dust, and water exposure.

• Simple 4-pin interface for plug-and-play integration.

• Ideal replacement for standard HC-SR04 in outdoor projects.

• Works reliably in harsh and industrial environments.

Applications

• Water tank and liquid level monitoring

• Outdoor distance and obstacle detection

• Smart irrigation and rainwater systems

• Industrial automation and safety systems

• Smart parking sensors

• Arduino and IoT weather or distance sensing projects