Keyestudio Smart Little Turtle Robot V3 Manual page 172

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analogWrite(right_pwm,200);
}
void Stop()//define the state of stop
{
analogWrite(left_pwm,0);
analogWrite(right_pwm,0);
}
//*********************************************************
(4) Test Result
Upload the code to the development board, and plug in power. Adjust the
servo on turtle robot car to 90°，dot matrix will display smile face pattern
and follow the obstacle to move.(robot car only moves forward and
backward).
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