sensor HC-SR04

hoi.

sorry, heb alles uitgezocht maar kan maar 1 sensor doen werken .
weet niet wat ik moet veranderen bij if ( distance1 > 30) en if ( distance2 < 30) {.
als ik dat verander werken de twee sensoren maar niet zo als ik wil

int trigPin2  = 2 ;
int echoPin2 = 3 ;
int trigPin1  = 4 ;
int echoPin1 = 5 ;


int revright = 8 ;       //REVerse motion of Left motor
int fwdleft = 9 ;       //ForWarD motion of Left motor
int revleft = 10 ;      //REVerse motion of Right motor
int fwdright = 11 ;

volatile float duration ;
volatile float distance1 ;
volatile float distance2 ;



void setup() {
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(trigPin1, OUTPUT);
  pinMode(echoPin1, INPUT );
  pinMode(trigPin2, OUTPUT);
  pinMode(echoPin2, INPUT );

  Serial.begin(96000);
}
void loop() {

  digitalWrite(trigPin1, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin1, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin1, LOW);
  duration = pulseIn(echoPin1, HIGH);
  distance1 = (duration * 0.0343) / 2;
  Serial.print("distance1: ");
  Serial.println(" cm");


  if ( distance1 > 30)



    digitalWrite(trigPin2, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin2, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin2, LOW);
  duration = pulseIn(echoPin2, HIGH);
  distance2 = (duration * 0.0343) / 2;
  Serial.print("distance: ");
  Serial.println(" cm");


  if ( distance2  < 30) {


    digitalWrite(8,  LOW);
    digitalWrite(9,  LOW);
    digitalWrite(10,  LOW);
    digitalWrite(11,  LOW);
    delay(1000);

    digitalWrite(8, LOW);
    digitalWrite(9, HIGH);
    digitalWrite(10, LOW);
    digitalWrite(11, HIGH);
    delay(500);

    digitalWrite(8, LOW);
    digitalWrite(9, LOW);
    digitalWrite(10, LOW);
    digitalWrite(11, LOW);
    delay(2000);

    digitalWrite(8, LOW );
    digitalWrite(9, LOW );
    digitalWrite(10, LOW );
    digitalWrite(11, HIGH );
    delay(500);

    digitalWrite(8,  LOW);
    digitalWrite(9,  LOW);
    digitalWrite(10,  LOW);
    digitalWrite(11,  LOW);
    delay(1000);

  } else  {
    digitalWrite(8, HIGH);
    digitalWrite(9, LOW);
    digitalWrite(10, HIGH);
    digitalWrite(11, LOW);

  }
}
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