Keyestudio Smart Little Turtle Robot V3 Manual page 93

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offers excellent non-contact range detection with high accuracy and stable
readings in an easy-to-use package. It comes complete with ultrasonic
transmitter and receiver modules.
The HC-SR04 or the ultrasonic sensor is being used in a wide range of
electronics projects for creating obstacle detection and distance measuring
application as well as various other applications. Here we have brought the
simple method to measure the distance with arduino and ultrasonic sensor
and how to use ultrasonic sensor wit h arduino.
(2) Specification：
 Power Supply :+5V DC
 Quiescent Current : <2mA
 Working Current: 15mA
 Effectual Angle: <15°
 Ranging Distance : 2cm – 400 cm
 Resolution : 0.3 cm
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