Hallo Leute,

dies ist mein erster Beitrag hier und entdecke seid ein paar Tagen die Welt der Mikrocontroller.

Folgenden Sketch habe ich auf meinem UNO-R3 an laufen.

Code:
int pingPin = 13;
int inPin = 12;
 
void setup() {
Serial.begin(9600);
}
 
void loop()
{
// establish variables for duration of the ping,
// and the distance result in inches and centimeters:
long duration, inches, cm;
 
// The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
pinMode(pingPin, OUTPUT);
digitalWrite(pingPin, LOW);
delayMicroseconds(2);
digitalWrite(pingPin, HIGH);
delayMicroseconds(10);
digitalWrite(pingPin, LOW);
 
// The same pin is used to read the signal from the PING))): a HIGH
// pulse whose duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
pinMode(inPin, INPUT);
duration = pulseIn(inPin, HIGH);
 
// convert the time into a distance
inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
 
Serial.println(cm, DEC);
 
delay(100);
}
 
long microsecondsToInches(long microseconds)
{
// According to Parallax's datasheet for the PING))), there are
// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
// second).  This gives the distance travelled by the ping, outbound
// and return, so we divide by 2 to get the distance of the obstacle.
return microseconds / 74 / 2;
}
 
long microsecondsToCentimeters(long microseconds)
{
// The speed of sound is 340 m/s or 29 microseconds per centimeter.
// The ping travels out and back, so to find the distance of the
// object we take half of the distance travelled.
return microseconds / 29 / 2;

}
jetzt verzweifel ich an der Fragestellung die Werte zu nutzen. Hierfür wollte ich eine LED an Pin 3 auf HIGH setzen wenn der Messwert unter 15cm fällt.

Folgender Code fiel mir dazu ein.
Code:
if (digitalRead(inPin)<=435){ // 15cm * 29 microseconds per centimeter (sollte die Distanz beschreiben)
    digitalWrite(3, HIGH);
  } else {
    digitalWrite(3, LOW);
  }
Diesen Code habe ich am Ende angefügt.

Code:
int pingPin = 13;
int inPin = 12;
 
void setup() {
Serial.begin(9600);
pinMode(3, OUTPUT);

}
 
void loop()
{
// establish variables for duration of the ping,
// and the distance result in inches and centimeters:
long duration, inches, cm;
 
// The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
pinMode(pingPin, OUTPUT);
digitalWrite(pingPin, LOW);
delayMicroseconds(2);
digitalWrite(pingPin, HIGH);
delayMicroseconds(10);
digitalWrite(pingPin, LOW);
 
// The same pin is used to read the signal from the PING))): a HIGH
// pulse whose duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
pinMode(inPin, INPUT);
duration = pulseIn(inPin, HIGH);
 
// convert the time into a distance
inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
 
Serial.println(cm, DEC);
 
delay(100);
}
 
long microsecondsToInches(long microseconds)
{
// According to Parallax's datasheet for the PING))), there are
// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
// second).  This gives the distance travelled by the ping, outbound
// and return, so we divide by 2 to get the distance of the obstacle.
return microseconds / 74 / 2;
}
 
long microsecondsToCentimeters(long microseconds)
{
// The speed of sound is 340 m/s or 29 microseconds per centimeter.
// The ping travels out and back, so to find the distance of the
// object we take half of the distance travelled.
return microseconds / 29 / 2;

if (digitalRead(inPin)<=435){  // 15cm * 29ms/cm
    digitalWrite(3, HIGH);
  } else {
    digitalWrite(3, LOW);
  }

}
Kann mir jemand Helfen mein Problem zu lösen?

Dank in Voraus.