Keyestudio Smart Little Turtle Robot V3 Manual page 99

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Serial.print("cm");
Serial.println();
delay(250);
}
//***************************************************************************
(7) Test Result
Upload test code on the development board, open serial monitor and set
baud rate to 9600. The detected distance will be displayed, the unit is cm
and inch. Hinder the ultrasonic sensor by hand, the displayed distance
value gets smaller.
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