Internet of things (IoT) is a system of interrelated computing devices, mechanical and digital machines provided with unique identifiers (UIDs) and the ability to transfer data over a network without requiring human-to-human or human-to-computer interaction.
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HC-SR04 Ultrasonic Sensor
Power Supply :5V DC
Quiescent Current : <2mA
Working Current: 15mA
Effectual Angle: <15°
Ranging Distance : 2cm – 400 cm or 1″ – 13ft
Resolution : upto 0.3 cm
45.3 x 20.4 x 15.4mm (not including 4-way header pins)