JSN_SR04T Waterproof Ultrasonic Distance Measuring Module

Key Specifications

• Working Voltage: DC 3V-5.5V (often 5V)
• Operating Current: <8mA (static <5mA)
• Probe Frequency: 40kHz
• Detection Range: 20cm – 600cm (Near Range: ~20cm, optimal: 25cm-450cm)
• Accuracy: ±1cm (typical)
• Measurement Angle: ~75° (or ±37.5°)
• Waterproof Rating: IP65 (Probe)
• Interface: 4-Pin (VCC, GND, Trig, Echo)
• Cable Length: ~2.5 meters (probe to module)

How It Works

1. Trigger: Send a 10µs high pulse to the Trig pin.
2. Transmit: The module sends out eight 40kHz ultrasonic pulses.
3. Echo: When a wave reflects, the Echo pin goes high for a duration (time-of-flight).
4. Calculate: Distance = (Echo Pulse Duration × Speed of Sound (340 m/s)) / 2.

Pinout & Connection (Arduino Example)

• VCC: 5V
• GND: GND
• Trig: Digital Pin (e.g., D3)
• Echo: Digital Pin (e.g., D2)