SunFounder Da Vinci Kit Bedienungsanleitung Seite 255

}
float disMeasure(void)
{
struct timeval tv1;
struct timeval tv2;
time1, time2;
long
float dis;
digitalWrite(Trig, LOW);
delayMicroseconds(2);
digitalWrite(Trig, HIGH);
delayMicroseconds(10);
digitalWrite(Trig, LOW);
while(!(digitalRead(Echo)
gettimeofday(&tv1, NULL);
while(!(digitalRead(Echo)
gettimeofday(&tv2, NULL);
time1 = tv1.tv_sec
time2 = tv2.tv_sec
dis = (float)(time2
return dis;
}
int main(void)
{
float dis;
if(wiringPiSetup()
printf("setup wiringPi failed
return 1;
}
ultraInit();
while(1){
dis = disMeasure();
printf("%0.2f
delay(300);
}
return 0;
}
Code Erklärung
void ultraInit(void)
{
pinMode(Echo, INPUT);
pinMode(Trig, OUTPUT);
}
1.8. 2 Eingabe
== 1));
== 0));
1000000 + tv1.tv_usec;
*
1000000 + tv2.tv_usec;
*
- time1) / 1000000
== -1){ //when initialize wiring failed,print message to screen
!");
cm\n\n",dis);
34000 / 2;
*
SunFounder Da Vinci Kit
(Fortsetzung der vorherigen Seite)
251