The Waterproof Ultrasonic Sensor Module measures distance by sending ultrasonic pulses (high-frequency sound waves above human hearing) and timing the echo (the reflected sound wave returning to the sensor). The ultrasonic sensor module jsn-sr04t separates the sensing head from the control PCB with an approximately 2.5 metre cable, so you can mount the probe near water while keeping your electronics dry. It operates at 5V DC, measures from 25cm to 4.5 meters, and resolves distance to 0.5 cm. The trigger and echo pins match the standard HC-SR04 pin interface.
A non-obvious detail about the jsn-sr04t waterproof sensor is that the minimum range is 25cm, not zero. Objects closer than 25cm fall inside the blind zone and return no valid reading. The honest trade-off is response time. The static current draw is just 5mA, but the sensor needs a clear unobstructed line-of-sight path. Foam surfaces, loose soil, and soft materials absorb sound poorly, which reduces effective range compared to hard flat surfaces.
The waterproof ultrasonic sensor works with Arduino IDE using the standard pulseIn function — no special library needed. Engineers building water level monitors, and hobbyists building rain-proof proximity detectors with sensor. Connect Trig and Echo to digital pins, power from 5V, and run the standard distance sketch to get readings in centimetres. StemVolt provides sensors with free shipping across India.
Related Product:
- Check out the DS18B20 Water Proof Temperature Probe Sensor
Features:
- Operating range of 25cm to 4.5m covers water tank depth, obstacle detection, and level monitoring applications.
- Resolution of 0.5 cm gives millimetre-class precision suitable for accurate liquid level measurements.
- 5V DC operating voltage connects directly to Arduino and Raspberry Pi 5V power pins.
- waterproof ultrasonic sensor datasheet confirms trigger-echo interface matching standard HC-SR04 pin assignments for direct code reuse.
Technical specifications:
| Specification | Details |
|---|---|
| Item Type | Ultrasonic sensor module |
| Operating voltage | 5V |
| Operating Range | 25cm ~ 4.5m |
| Sensor type | Waterproof sensor |
| Static Current | 5mA |
| Resolution | 0.5 cm |
| Cable length | Approx 2.5 meters |
Applications:
- Garden water tank uses this sensor to show how much water is left inside the tank.
- Flood alert project uses this to detect rising water level and trigger a buzzer alarm.
- Waterproof Ultrasonic Sensor Module measures sump pit water depth and sends readings to a dashboard remotely.
- Outdoor obstacle avoidance robot reads echo pulses over 4.5 meters and steers away from detected objects.
Package includes:
- 1 x Waterproof Ultrasonic Sensor Module
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