Page 142 - MDP2020-1

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if ( (i >= 4) && (i % 2 == 0) )
{
dht11_dat[j / 8] <<= 1;
if ( counter > 16 )
dht11_dat[j / 8] |= 1;
j++;
}
}

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( void )
{
printf( "Raspberry Pi wiringPi DHT11 Temperature test program\n" );

if ( wiringPiSetup() == -1 )
exit( 1 );

while ( 1 )
{
read_dht11_dat();
delay( 1000 );
}

return(0);
}

3. 컴파일 한다.
$ gcc -o dht11temp dht11temp.c -lwiringPi -lwiringPiDev

4. lcd.c 파일 생성후 nano편집기를 이용하여 소스코드를 입력한다.
#include <wiringPi.h>
#include <lcd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

//USE WIRINGPI PIN NUMBERS
#define LCD_RS 25 //Register select pin
#define LCD_E 24 //Enable Pin
#define LCD_D4 23 //Data pin 4
#define LCD_D5 22 //Data pin 5