Mercurial > mbsePi-apps / file comparison
comparison: dht11/dht11.c
dht11/dht11.c
- changeset 146
- 11f431ac253d
- parent 51
- a03b6dac5398
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| 145:1396350141cf | 146:11f431ac253d |
|---|---|
| 18 * You should have received a copy of the GNU General Public License | 18 * You should have received a copy of the GNU General Public License |
| 19 * along with EC-65K; see the file COPYING. If not, write to the Free | 19 * along with EC-65K; see the file COPYING. If not, write to the Free |
| 20 * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | 20 * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 21 *****************************************************************************/ | 21 *****************************************************************************/ |
| 22 | 22 |
| 23 #include "../config.h" | |
| 24 #include <stdio.h> | |
| 25 #include <stdlib.h> | |
| 26 #include <stdint.h> | |
| 27 #include <stdarg.h> | |
| 28 #include <syslog.h> | |
| 29 #include <unistd.h> | |
| 30 | |
| 23 #include "dht11.h" | 31 #include "dht11.h" |
| 24 | 32 |
| 25 #ifdef HAVE_WIRINGPI_H | 33 #ifdef HAVE_WIRINGPI_H |
| 34 #include <wiringPi.h> | |
| 26 | 35 |
| 27 #define MAXTIMINGS 100 | 36 #define MAXTIMINGS 100 |
| 28 | 37 |
| 29 int dht11_pin = -1; | 38 int dht11_pin = -1; |
| 30 int dht11_temperature = -1; | 39 int dht11_temperature = -1; |
| 31 int dht11_humidity = -1; | 40 int dht11_humidity = -1; |
| 32 int dht11_valid = false; | 41 int dht11_valid = FALSE; |
| 33 int dht11_t_offset = 0; | 42 int dht11_t_offset = 0; |
| 34 int dht11_h_offset = 0; | 43 int dht11_h_offset = 0; |
| 35 | 44 |
| 36 | 45 |
| 37 | 46 |
| 120 } else { | 129 } else { |
| 121 syslog(LOG_NOTICE, "dht11 sensor not present"); | 130 syslog(LOG_NOTICE, "dht11 sensor not present"); |
| 122 } | 131 } |
| 123 dht11_temperature = -1; | 132 dht11_temperature = -1; |
| 124 dht11_humidity = -1; | 133 dht11_humidity = -1; |
| 125 dht11_valid = false; | 134 dht11_valid = FALSE; |
| 126 return; | 135 return; |
| 127 } | 136 } |
| 128 | 137 |
| 129 /* | 138 /* |
| 130 * check we read 40 bits (8bit x 5 ) + verify checksum in the last byte | 139 * check we read 40 bits (8bit x 5 ) + verify checksum in the last byte |
| 141 if ((dht11_dat[2] & 0x80) != 0) | 150 if ((dht11_dat[2] & 0x80) != 0) |
| 142 t *= -1; | 151 t *= -1; |
| 143 | 152 |
| 144 dht11_temperature = t; | 153 dht11_temperature = t; |
| 145 dht11_humidity = h; | 154 dht11_humidity = h; |
| 146 dht11_valid = true; | 155 dht11_valid = TRUE; |
| 147 } else { | 156 } else { |
| 148 tries--; | 157 tries--; |
| 149 if (tries == 0) | 158 if (tries == 0) |
| 150 syslog(LOG_INFO, "dht11 data checksum was wrong 5 times"); | 159 syslog(LOG_INFO, "dht11 data checksum was wrong 5 times"); |
| 151 usleep(100000); | 160 usleep(100000); |
