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 on the Trig pin. The module will automatically emit eight 40 kHz ultra pulses and detect echo returns. When an echo is detected, the Echo pin outputs a high-level signal whose duration corresponds to the time taken for the sound wave to travel to the target and back. Distance = (Echo pulse width × speed of sound in air (340 m/s)) / 2. Continuous measurements support real-time distance monitoring. Module Working Principle: (1) IO-triggered ranging: Provide a high-level trigger signal of ≥10 µs. (2) Module automatically transmits eight 40 kHz ultra pulses and checks for echo return. (3) Upon echo detection, the Echo pin outputs a high-level signal. Pulse width equals round-trip time of ultra wave. Distance calculation: (High-level duration × 340 m/s) / 2. 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 Output Level (Low): 0 V Sensing Angle: ≤ 15° Detection Range: 2 cm – 450 cm Accuracy: ±0.3 cm Material: PCB Color: As shown Package Contents: 1 × Ultra 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 conditions and display settings. Measurement tolerance: ±1–3 cm.