Features 【Strong Adaptability】This built-in ultrasonic measuring board module with wired waterproof sensor is suitable for many harshest environments, such as: B. for wet and rough measurements. 【Accurate Measurement】Ultrasonic sensor module is made of high quality material, stable performance, accurate measurement distance, high module accuracy, blind area (25cm), stable distance measurement is the solid basis for this product's success in the market 【High Accuracy】Our waterproof ultrasonic transducer probe has high measurement accuracy and strong anti-interference ability, so users can rest assured to use and operate this ultrasonic wave distance detector. Wide Application This built-in ultrasonic wave distance sensor module can be widely used for horizontal distance measurement, obstacle avoidance, automatic control, safety, industrial control, etc. 【Satisfaction Guarantee】We offer our best service and high quality ultrasonic sensor. If you have any questions about our products, please feel free to contact us. We will try our best to help you and reply you within 24 hours. Wiring: +5V (positive power) Trig (control) RX Echo (Receive) TX GND (Negative Power Supply) Basic working principle: (1) With TRIG trigger measurement distance from IO port, high level signal for at least 10uS. (2) The module automatically sends eight 40kHz square waves and automatically detects if there is a return signal. (3) When there is a return signal, ECHO emits a high level via the I/O port. The duration of the high level corresponds to the time of the ultrasonic wave from its emission to its return. Test distance = (high level time * sound speed (340m/S)) )/2; This module is easy to use. A port sends a high level of more than 10 µS and then waits for high level output to the receiving port. The timer has been activated once an output has occurred and will read the time that port gets low, which is the time of this measurement. Use time to calculate distance. You can determine your moving measurements with a constant cycle measurement. The ultrasonic timing diagram shows that it is sufficient to provide a pulse trigger signal greater than 10 uS. The module inside sends eight cycle levels of 40 kHz and detects the return wave. Emits the echo signal as soon as the return signal is detected. The pulse width of the echo signal is proportional to the measured distance. Therefore, calculate the distance using the interval between sending the signal and receiving the echo signal. Formula: US/58=cm or US/148=inch; Or: Distance = High Level Time * Sound Speed (340m/S)/2; The recommended test cycle is more than 60ms to avoid the transmission signal affecting the echo signal. Package Includes: 1 x Distance Measurement Module and Sensor Package List