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JSN-SR04T / AJ-SR04T Waterproof Ultrasonic
Sensors
Product ID:
HF298963
Stock:
-8 units available
Details:
🔹 Overview
Type: Ultrasonic distance sensor (waterproof version)
Principle: Measures distance ...
🔹 Overview
Type: Ultrasonic distance sensor (waterproof version)
Principle: Measures distance by sending an ultrasonic pulse and measuring the time it takes to reflect back from an object.
Waterproof: Can be used in wet environments, rain, or even submerged in shallow water (housing protects electronics).
Applications: Liquid level detection, obstacle avoidance, robotic sensing, tank water level monitoring.
🔹 Key Features
Waterproof design – sensor head is sealed; suitable for outdoor and wet environments.
Operating voltage: 3.3–5 V DC
Distance measurement range: ~20 cm to 600 cm (varies slightly by model)
Accuracy: ±1 cm to ±2 cm
Interface: Digital trigger (input) and echo (output) pins, compatible with microcontrollers (Arduino, ESP32, Raspberry Pi, etc.)
Ultrasonic frequency: ~40 kHz (standard for ultrasonic distance sensors)
🔹 Pinout
Most JSN-SR04T / AJ-SR04T modules have 4 pins:
Pin Function Description
VCC Power supply 3.3–5 V DC
GND Ground Connect to system ground
TRIG Trigger input Send a 10 µs HIGH pulse to start measurement
ECHO Echo output Output pulse width proportional to distance
🔹 Working Principle
Trigger pulse: MCU sends a short HIGH pulse (typically 10 µs) to TRIG pin.
Ultrasonic burst: Sensor emits an ultrasonic pulse at ~40 kHz.
Echo detection: The sensor receives the reflected pulse from the object.
Pulse width measurement: ECHO pin goes HIGH for a duration proportional to the distance.
Formula:
Distance (cm)
=
Time (µs)
×
0.0343
2
Distance (cm)=
2
Time (µs)×0.0343
(0.0343 cm/µs = speed of sound in air; divide by 2 for round-trip)
🔹 Applications
Water tank level monitoring (waterproof)
Outdoor robots / obstacle avoidance
Rain or flood detection systems
Automated liquid dispensing systems
🔹 Advantages
Waterproof, suitable for wet or outdoor environments
Long-range distance measurement (up to ~6 m)
Easy to interface with microcontrollers using simple digital pins
Reliable and low-cost
Read more
PKR 1300.00