Keyestudio Smart Little Turtle Robot V3 Manual page 103

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Serial.print("cm");
Serial.println();
delay(250);
if (cm>=2 && cm<=10)
{
Serial.println("HIGH");
digitalWrite(3, HIGH);
}
else
{
Serial.println("LOW");
digitalWrite(3, LOW);
}
}
//*****************************************************************
Upload test code to development board and block ultrasonic sensor by
hand, then check if LED is on
103