/Features: Stable performance and precise distance measurement High-precision module with 2 cm minimum detection distance Wiring: VCC, Trig (control pin), Echo (output pin), GND Usage: Apply a 10 µs or longer high-level pulse to the Trig pin to initiate measurement. The Echo pin outputs a high-level signal whose duration corresponds to the time taken for the ultrasonic wave to travel to the target and back. Distance = (Echo pulse duration × speed of sound in air (340 m/s)) / 2. Continuous measurements support real-time distance monitoring. Module Working Principle: (1) Trigger ranging via IO by sending a ≥10 µs high-level pulse; (2) Module automatically transmits eight 40 kHz ultrasonic pulses and detects echo return; (3) Upon echo detection, the Echo pin outputs a high-level signal. Pulse width equals round-trip time of ultrasonic wave. Specifications: Type: A-HY-SRF05 (5-pin) / B-HC-SR04 (4-pin) Operating Voltage: DC 5 V Quiescent Current: < 2 mA Output Level: High = 5 V, Low = 0 V Sensing Angle: ≤ 15° Detection Range: 2 cm – 450 cm Accuracy: ±0.3 cm Material: PCB Color: As shown Package Includes: 1 × ultrasonic sensor module Note: Slight variations in appearance or labeling may occur between batches but do not affect functionality. Color representation may vary slightly due to lighting and screen settings. Measurement tolerance: ±1–3 cm.