Ich habe folgendes problem : Im Netz habe ich ein Howto befolgt ,aber ich bräuchte dieses Script für den DHT22 ...
er wirft wo komische Daten aus , und mit .c kenne ich mich neider nicht aus ..
Kann mir das jemand von euch ändern ?
In der Shell zeigt er folgendes an : Humidity = 0.10 % Temperature = 1.320▒C
Danke im vorraus
C
#include <wiringPi.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <time.h>
#define MAX_TIME 85
#define DHT11PIN 7
int dht11_val[5]={0,0,0,0,0};
void dht11_read_val()
{
uint8_t lststate=HIGH;
uint8_t counter=0;
uint8_t j=0,i;
for(i=0;i<5;i++)
dht11_val[i]=0;
pinMode(DHT11PIN,OUTPUT);
digitalWrite(DHT11PIN,LOW);
delay(18);
digitalWrite(DHT11PIN,HIGH);
delayMicroseconds(40);
pinMode(DHT11PIN,INPUT);
for(i=0;i<MAX_TIME;i++)
{
counter=0;
while(digitalRead(DHT11PIN)==lststate){
counter++;
delayMicroseconds(1);
if(counter==255)
break;
}
lststate=digitalRead(DHT11PIN);
if(counter==255)
break;
// top 3 transistions are ignored
if((i>=4)&&(i%2==0)){
dht11_val[j/8]<<=1;
if(counter>16)
dht11_val[j/8]|=1;
j++;
}
}
// verify cheksum and print the verified data
if((j>=40)&&(dht11_val[4]==((dht11_val[0]+dht11_val[1]+dht11_val[2]+dht11_val[3])& 0xFF)))
{
printf("Humidity = %d.%d %% Temperature = %d.%d°C\n",dht11_val[0],dht11_val[1],dht11_val[2],dht11_val[3]);
char text[100];
time_t now = time(NULL);
struct tm *t = localtime(&now);
strftime(text, sizeof(text)-1, "%d-%m-%Y", t);
char prefix[50] = "/var/www/log-";
strcat(prefix,text);
char suffix[50] = ".csv";
strcat(prefix,suffix);
FILE *fp;
fp=fopen(prefix,"a");
fprintf(fp,"%u000,%d%d,%d\n",(unsigned)time(NULL),dht11_val[2],dht11_val[3],dht11_val[0]);
fclose(fp);
FILE *fh;
fh=fopen("/var/www/current_hyg.csv", "w");
fprintf(fh,"%d\n",dht11_val[0]);
fclose(fh);
FILE *ft;
ft=fopen("/var/www/current_temp.csv", "w");
fprintf(ft,"%d.%d\n",dht11_val[2],dht11_val[3]);
fclose(ft);
exit(1);
}
else
printf("Invalid Data!!\n");
}
int main(void)
{
printf("Interfacing Temperature and Humidity Sensor (DHT11) With Banana Pi\n");
if(wiringPiSetup()==-1)
exit(1);
while(1)
{
dht11_read_val();
delay(3000);
}
return 0;
}