Code Erklärung - SunFounder Da Vinci Kit Bedienungsanleitung

SunFounder Da Vinci Kit
pinMode(dhtPin, OUTPUT);
digitalWrite(dhtPin, LOW);
delay(18);
// then pull it up for 40 microseconds
digitalWrite(dhtPin, HIGH);
delayMicroseconds(40);
// prepare to read the pin
pinMode(dhtPin, INPUT);
// detect change and read data
for ( i=0; i< maxTim; i++) {
counter = 0;
while (digitalRead(dhtPin)
counter++;
delayMicroseconds(1);
if (counter
break;
}
}
laststate =
if (counter
// ignore first 3 transitions
if ((i >= 4)
// shove each bit into the storage bytes
dht11_dat[j/8]
if (counter
dht11_dat[j/8]
j++;
}
}
// check we read 40 bits (8bit x 5 ) + verify checksum in the last byte
// print it out if data is good
if ((j >= 40) &&
(dht11_dat[4]
dat[3]) & 0xFF)) ) {
Fah = dht11_dat[2]
printf("Humidity = %d.%d %% Temperature = %d.%d * C (%.1f *
dht11_dat[0], dht11_dat[1], dht11_dat[2], dht11_dat[3], Fah);
}
}
int main (void) {
if(wiringPiSetup()
printf("setup wiringPi failed
return 1;
}
while (1) {
readDht11();
delay(500);
}
return 0 ;
}
Code Erklärung
232
== laststate) {
== 255) {
digitalRead(dhtPin);
== 255) break;
&& (i%2 == 0)) {
<<= 1;
> 50)
|= 1;
== ((dht11_dat[0]
9. / 5. +
*
== -1){ //when initialize wiring failed, print messageto screen
!");
// wait 1sec to refresh
+ dht11_dat[1]
32;
(Fortsetzung der vorherigen Seite)
+ dht11_dat[2] + dht11_
F)\n",
Kapitel 1. Über das Da Vinci Kit