Hi, Dennis Lee Bieber
Thanks for the valuable effort but i am unaware of the python language and
hence it would be really appreciable if you could provide me your help in
C/C++ language only.
On Tuesday, March 22, 2016 at 10:47:45 AM UTC+5:30, Sumit Bhut wrote:
>
> Hello friends,
>
> I'm compilited this code for interface BBB with DHT11(temperature-humidity
> sensor) this code is compiled and run successfully but OUTPUT
> is
> *0'c temperature - 0% humidity ....Plz *, find error this code...
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> *Code-#include <stdio.h>#include <stdlib.h>#include <string.h>#include
> <time.h>#include <stdint.h>#include <sys/time.h>#include <unistd.h>#define
> MAXTIMINGS 85#define DHTPIN 48int dht11_dat[5] = { 0, 0, 0, 0, 0
> };void inputdirection(int pin);int readpin(int pinnum);void
> outputdirection();void writepin(int pinnum, int value);void pauseSec(int
> sec);void pauseNanoSec(long nano);void outputdirection(){ char
> buf[10]; char buf2[50] = "/sys/class/gpio/gpio"; FILE
> *in,*indir; in = fopen("/sys/class/gpio/export", "w");
> fseek(in,0,SEEK_SET);
> fprintf(in,"%d",48); fflush(in);
> sprintf(buf,"%i",48);
> strcat(buf2,strcat(buf,"/direction"));
> indir = fopen(buf2, "w");
> fseek(indir,0,SEEK_SET);
> fprintf(indir,"out");
> fflush(indir);
> fclose(in);
> fclose(indir);}void inputdirection(int pin){
> char buf[10]; char buf2[50] = "/sys/class/gpio/gpio"; FILE
> *in,*indir; in = fopen("/sys/class/gpio/export", "w");
> fseek(in,0,SEEK_SET); fprintf(in,"%d",48);
> fflush(in);
> sprintf(buf,"%i",48);
> strcat(buf2,strcat(buf,"/direction"));
> indir = fopen(buf2, "w");
> fseek(indir,0,SEEK_SET);
> fprintf(indir,"in");
> fflush(indir);
> fclose(in);
> fclose(indir);}int readpin(int pinnum){ int value; FILE
> *inval; inval = fopen("/sys/class/gpio/gpio48/value",
> "r"); fseek(inval,0,SEEK_SET);
> fscanf(inval,"%d",&value);
> fclose(inval); return value;}
> void writepin(int pinnum, int value){ FILE *val; char
> buf[5]; char buf2[50] = "/sys/class/gpio/gpio";
> sprintf(buf,"%i",pinnum);
> strcat(buf2,strcat(buf,"/value")); val =
> fopen(buf2, "w"); fseek(val,0,SEEK_SET);
> fprintf(val,"%d",value);
> fflush(val);
> fclose(val);}void pauseSec(int sec){ time_t now,later;
> now = time(NULL); later = time(NULL);
> while((later - now) < (double)sec) later =
> time(NULL);}void pauseNanoSec(long nano){ struct timespec tmr1;
> tmr1.tv_sec = 0; tmr1.tv_nsec = nano;
> } void read_dht11_dat(){ uint8_t laststate = 1; uint8_t
> counter = 0; uint8_t j = 0, i; float f; /*
> fahrenheit */ dht11_dat[0] = dht11_dat[1] = dht11_dat[2] = dht11_dat[3]
> = dht11_dat[4] = 0; /* pull pin down for 18 milliseconds */
> outputdirection(); writepin(48,0); usleep(18000); /* then pull it
> up for 40 microseconds */ writepin(48,1); usleep(40); /*
> prepare to read the pin */ inputdirection(48); /* detect change and
> read data */ for ( i = 0; i < MAXTIMINGS; i++ ) { counter =
> 0; while ( readpin(48) == laststate ) {
> counter++; usleep( 1 ); if ( counter == 255 )
> { break; } } laststate =
> readpin(48); if ( counter == 255 ) break; /*
> ignore first 3 transitions */ if ( (i >= 4) && (i % 2 == 0) )
> { /* shove each bit into the storage bytes */
> dht11_dat[j / 8] <<= 1; if ( counter > 16 )
> dht11_dat[j / 8] |= 1; 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] ==
> ( (dht11_dat[0] + dht11_dat[1] + dht11_dat[2] + dht11_dat[3]) & 0xFF) )
> ) {*/ f = dht11_dat[2] * 9. / 5. + 32; printf( "Humidity =
> %d.%d %% Temperature = %d.%d *C (%.1f *F)\n", dht11_dat[0],
> dht11_dat[1], dht11_dat[2], dht11_dat[3], f ); /*}else { printf(
> "Data not good, skip\n" ); }*/}int main() { while ( 1 )
> { read_dht11_dat(); pauseSec( 1 ); /* wait 1sec to refresh */
> } return(0);}*
>
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