DFRobot A01NYUB Waterproof Ultrasonic Distance Sensor (28-750cm Detection Range)

📏 DFRobot A01NYUB Waterproof Ultrasonic Distance Sensor (28–750 cm) — Technical Information
🔍 Overview
The DFRobot A01NYUB ultrasonic distance sensor is a waterproof ultrasonic ranging module designed for long-distance measurement in harsh environments.
Measures:
Distance (non-contact)
Detection range:
28 cm to 750 cm (0.28 m to 7.5 m)
Output:
UART serial data
👉 It is optimized for outdoor and industrial distance sensing applications.
⚙️ Working Principle
🔊 Ultrasonic Time-of-Flight (ToF)
The sensor operates using the ultrasonic time of flight principle:
1. 📡 Ultrasonic Emission
Sensor emits high-frequency sound waves (~40 kHz)
2. 🎯 Reflection from Object
Sound waves hit an object and reflect back
3. ⏱️ Time Measurement
Sensor measures time taken for echo to return
4. 📐 Distance Calculation
Distance=v×t2\text{Distance} = \frac{v \times t}{2}Distance=2v×t​
Where:
vvv = speed of sound (~343 m/s)
ttt = time delay
👉 Division by 2 accounts for round-trip travel.
📊 Measurement Characteristics
Range: 28 cm to 750 cm
Accuracy: ~±1% (typical)
Resolution: ~1 mm (effective resolution varies)
Detection Features
Stable long-range measurement
Good performance in:
Dusty
Wet
Outdoor environments
⚡ Electrical Characteristics
Supply voltage: 3.3V to 5V
Current consumption: low (typical tens of mA during operation)
🔗 Output Interface
UART Serial Output
Provides distance data in digital format
No need for timing measurement by microcontroller
Data Format
Sends distance continuously or on request
Easy integration with microcontrollers
🧠 Internal Features
✔ Waterproof Transducer
Fully sealed ultrasonic probe
Suitable for:
Wet environments
Outdoor installations
✔ Built-in Signal Processing
Handles:
Echo detection
Noise filtering
Distance calculation
✔ Temperature Compensation (Basic)
Improves measurement stability
✔ Wide Beam Angle
Detects objects within a broad sensing area
🔄 Operating Behavior
✔ Continuous Measurement
Outputs distance data periodically
✔ Non-Contact Sensing
No physical contact required
Safe for moving or sensitive objects
✔ Environmental Robustness
Works in:
Rain
Dust
Humid environments
🌡️ Environmental Characteristics
Waterproof design (probe level)
Suitable for outdoor use
Performance affected by:
Temperature (affects sound speed)
Soft/absorbing surfaces (weak reflections)
⚠️ Limitations
Minimum range:
Cannot detect objects closer than ~28 cm
Accuracy affected by:
Air temperature
Wind
Surface texture
Not ideal for:
Very small or angled objects
🔌 Typical Pin Configuration
VCC → Power supply
GND → Ground
TX → Serial data output
RX → Serial input (optional control)
🧩 Functional Role
The module acts as a:
Distance measurement sensor
Level detection sensor (e.g., water tanks)
Obstacle detection device
🏁 Summary
The DFRobot A01NYUB Ultrasonic Sensor is a rugged, waterproof distance sensing solution that:
Uses ultrasonic time-of-flight technology
Measures distances from 28 cm to 7.5 m
Provides UART digital output
Works reliably in harsh and outdoor environments
Is ideal for non-contact level and distance measurement systems