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delayMicroseconds(pulsewidth);
digitalWrite(servoPin,LOW);
delay((20 - pulsewidth / 1000));
}}
//The function to control ultrasonic sensor function controlling
ultrasonic
float checkdistance() {
digitalWrite(Trig, LOW);
delayMicroseconds(2);
digitalWrite(Trig, HIGH);
delayMicroseconds(10);
digitalWrite(Trig, LOW);
float distance = pulseIn(Echo, HIGH) / 58.20;
2*29.1=58.2
delay(10);
return distance;
}
//****************************************************************
(5) Test Result
Upload code successfully, DIP switch is dialed to right end, the
servo rotates to 90°, "V" is shown on 8X16 LED panel and smart
car moves as the obstacle moves.
//58.20, that is ,
192
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