Ultrasonic

Ultrasonic Sensor

An ultrasonic sensor is an excellent way to detect obstacles.

Example: HC-SR04

Distance 2 to 450 cm

Current 15 mA

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  HC-SR04

• 

  HC-SR04 schematics

Wiring

Ultrasonic Module VCC (+5V) — PCB VCC (+5V) Ultrasonic Module GND — PCB GND Ultrasonic Module Trigger — PCB Digital Pin Ultrasonic Module Echo — PCB Digital Pin

An internal schematics of the sensor can be found here.[1]