HC-SR04 Ultrasonic Distance Sensor x5
Acrylic Mounting Bracket x5
Female to Male Jumper Wires x20
Male to Male Jumper Wires x20

Working Principle:
Pull the Trig pin to a high level for over 10 microseconds pulse, and the module starts ranging.
The module automatically sends eight 40KHz square waves to detect whether a signal is returned.
After ranging, if an object is detected in front, the Echo pin will be at a high level, with the duration of the high level varying based on the distance, allowing for easy distance calculation. Distance = (Duration of high level) * (Speed of Sound: 340m/s) / 2

Specifications:

Operating Voltage: DC5V
Quiescent Current: Output Level: High 5V, Low 0V
Detection Angle: No more than 15 degrees
Detection Range: 0.79 in--177 in
High Accuracy: Up to 0.12 in
Connection Mode: VCC, trig (control), echo (receiving end), GND ground wire