Description/Features: Stable performance and precise distance measurement High-precision module with ultra-close blind spot (2 cm) Wiring: VCC, Trig (control pin), Echo (receiver pin), GND Usage: Trigger the module by sending a high-level signal of at least 10 µs to the Trig pin. The module will automatically emit eight 40 kHz ultrasonic pulses and detect their return. When a signal is received, the Echo pin outputs a high-level pulse; its duration corresponds to the time taken for the ultrasonic wave to travel to the target and back. Distance = (pulse duration × speed of sound in air (340 m/s)) / 2. This process enables continuous distance measurement. Module working principle: (1) IO-triggered ranging: apply a high-level signal of ≥10 µs to the Trig pin; (2) Module automatically transmits eight 40 kHz ultrasonic pulses and checks for echo return; (3) Upon detection of an echo, the Echo pin outputs a high-level signal. Pulse width equals round-trip time of ultrasonic wave. Specifications: Type: A-HY-SRF05 / SRF05 (5-pin) or B-HC-SR04 / 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 Contents: 1 × Ultrasonic Distance Sensor Module Note: Slight variations in appearance or labeling may occur between batches without affecting functionality. Color representation may vary slightly due to lighting conditions and screen settings. Measurement tolerance: ±1–3 cm.