/Features: Stable performance and precise distance measurement High precision module with ultra-close blind spot (2 cm) Wiring methods: VCC, Trig (control end), Echo (receiver end), GND Usage: A control port sends a high-level signal of at least 10 µs; the receiving port outputs a high-level signal upon detection. Start a timer when the high level appears and stop it when the signal returns to low. The elapsed time corresponds to the ultrasonic travel time, enabling distance calculation. Continuous measurement supports dynamic applications. Module working principle: (1) IO-triggered ranging requires a high-level trigger signal of at least 10 µs; (2) The module automatically transmits eight 40 kHz ultrasonic pulses and detects echo return; (3) Upon echo detection, a high-level signal is output via IO. The high-level duration equals the round-trip time of the ultrasonic wave. Distance = (High-level duration × Speed of sound (340 m/s)) / 2 Specifications: Type: A-HY-SRF05 SRF05 5-pin / B-HC-SR04 SR04 4-pin Operating voltage: DC 5 V Quiescent current: < 2 mA Output high level: 5 V Output low level: 0 V Sensing angle: ≤ 15 degrees Detection range: 2 cm – 450 cm Accuracy: up to 0.3 cm Product appearance and labeling may vary slightly between batches without affecting functionality. Material: PCB Color: As shown Package Contents: 1 × module Note: Color representation may vary slightly due to lighting conditions and display settings. Measurement tolerance: ±1–3 cm.