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pitempd.c
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pitempd.c
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/*
* pitempd.c:
* Simple daemon for monitoring multiple temperature sensors
* Amended by technion@lolware.net
* And then tweaked by mpember@mpember.net.au
* Version 1.0.0
* * Initial Release
* Version 1.1.0
* + Support for configuration file
* + Support for debug mode
* Version 1.2.0
* + Support for Thingpeak API
* Version 1.2.1
* + Move sensor settings into own section of config file
* Version 1.3.0
* + Support for Pushover API
* + Support for triggering alerts based on temperature
* Version 1.3.1
* ! Detect missing Pushover / Thingspeak tokens
* Version 1.3.2
* + Offline mode to avoid excess web traffic
* Version 1.3.3
* + Adjust Pushover message to identify sensor
* + Modify timing for inerval checks
* Version 1.4.0
* + Wait for second extreme result before accepting reading
* Version 1.5.0
* + Add Offset setting to adjust reading
*/
#include <wiringPi.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <curl/curl.h>
#include "minini/minIni.h"
#define sizearray(a) (sizeof(a) / sizeof((a)[0]))
#define MAXTIMINGS 85
static char inifile[] = "/etc/pitempd.conf";
static bool _DEBUG = false;
static bool _OFFLINE = false;
static int GPIO_PIN[2] = {-1,-1};
static char GPIO_LABEL[2][20];
static float trigger_high[2] = {0,0};
static float trigger_low[2] = {0,0};
static float offset_temp[2] = {0,0};
static float offset_hum[2] = {0,0};
float trigger_state[2] = {0,0};
float stats[4] = {0,0,0,0};
int submit_pushover(char message[100]) {
CURL *curl;
CURLcode res;
char token[32];
char user[32];
char postdata[100];
int priority;
if (_OFFLINE) {
if (_DEBUG) printf("Pushover Message: %s\n", message);
return 0;
}
if (
ini_gets("pushover", "token", "", token, sizearray(token), inifile) == 0 ||
ini_gets("pushover", "user", "", user, sizearray(user), inifile) == 0
) return 0;
priority = ini_getl("pushover", "priority", 0, inifile);
/* In windows, this will init the winsock stuff */
curl_global_init(CURL_GLOBAL_ALL);
/* get a curl handle */
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://api.pushover.net/1/messages.json");
// sprintf(postdata, "token=%s&user=%s&priority=%i&message=%s", token, user, priority, curl_easy_escape(curl, message, 0));
sprintf(postdata, "token=%s&user=%s&message=%s", token, user, curl_easy_escape(curl, message, 0));
if (_DEBUG) printf("POST Data: %s\n", postdata);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postdata);
/* Perform the request, res will get the return code */
res = curl_easy_perform(curl);
/* Check for errors */
if(res != CURLE_OK)
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
/* always cleanup */
curl_easy_cleanup(curl);
}
curl_global_cleanup();
return 0;
}
int submit_thingspeak(void) {
CURL *curl;
CURLcode res;
char token[17];
char postdata[100];
if (_OFFLINE || ini_gets("thingspeak", "token", "", token, sizearray(token), inifile) == 0) return 0;
/* In windows, this will init the winsock stuff */
curl_global_init(CURL_GLOBAL_ALL);
/* get a curl handle */
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://api.thingspeak.com/update");
sprintf(postdata, "key=%s&field1=%.2f&field2=%.2f&field3=%.2f&field4=%.2f", token, stats[0], stats[1], stats[2], stats[3]);
if (_DEBUG) printf("POST Data: %s\n", postdata);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postdata);
/* Perform the request, res will get the return code */
res = curl_easy_perform(curl);
/* Check for errors */
if(res != CURLE_OK)
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
/* always cleanup */
curl_easy_cleanup(curl);
}
curl_global_cleanup();
return 0;
}
static uint8_t sizecvt(const int read) {
/* digitalRead() and friends from wiringpi are defined as returning a value
< 256. However, they are returned as int() types. This is a safety function */
if (read > 255 || read < 0) {
if (_DEBUG) printf("Invalid data from wiringPi library\n");
exit(EXIT_FAILURE);
}
return (uint8_t)read;
}
static int write_state(int SENSOR) {
FILE *fp;
char state_file[20] = "";
sprintf(state_file, "/tmp/temp%c.state", SENSOR+'0');
if ((fp=fopen(state_file, "w")) == NULL)
printf("Sensor %i: State file failed to open\n", SENSOR);
else {
fprintf(fp, "%.2f %.2f", stats[(SENSOR*2) + 0], stats[(SENSOR*2) + 1]);
fflush(fp);
fclose(fp);
}
return 0;
}
static int read_dht22_dat(int SENSOR) {
static int dht22_dat[5] = {0,0,0,0,0};
uint8_t laststate = HIGH;
uint8_t counter = 0;
uint8_t j = 0, i;
dht22_dat[0] = dht22_dat[1] = dht22_dat[2] = dht22_dat[3] = dht22_dat[4] = 0;
if (_DEBUG) printf("Reading %s sensor on GPIO pin %i\n", GPIO_LABEL[SENSOR], GPIO_PIN[SENSOR]);
if (GPIO_PIN[SENSOR] < 0) return 0;
// pull pin down for 18 milliseconds
pinMode(GPIO_PIN[SENSOR], OUTPUT);
digitalWrite(GPIO_PIN[SENSOR], HIGH);
delay(10);
digitalWrite(GPIO_PIN[SENSOR], LOW);
delay(18);
// then pull it up for 40 microseconds
digitalWrite(GPIO_PIN[SENSOR], HIGH);
delayMicroseconds(40);
// prepare to read the pin
pinMode(GPIO_PIN[SENSOR], INPUT);
// detect change and read data
for (i=0; i < MAXTIMINGS; i++) {
counter = 0;
while (sizecvt(digitalRead(GPIO_PIN[SENSOR])) == laststate) {
counter++;
delayMicroseconds(1);
if (counter == 255) break;
}
laststate = sizecvt(digitalRead(GPIO_PIN[SENSOR]));
if (counter == 255) break;
// ignore first 3 transitions
if ((i >= 4) && (i%2 == 0)) {
// shove each bit into the storage bytes
dht22_dat[j/8] <<= 1;
if (counter > 16) dht22_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) &&
(dht22_dat[4] == ((dht22_dat[0] + dht22_dat[1] + dht22_dat[2] + dht22_dat[3]) & 0xFF)) ) {
float t, h;
h = (float)dht22_dat[0] * 256 + (float)dht22_dat[1];
h /= 10;
t = (float)(dht22_dat[2] & 0x7F)* 256 + (float)dht22_dat[3];
t /= 10.0;
if ((dht22_dat[2] & 0x80) != 0) t *= -1;
if (offset_temp[SENSOR] != 0) t = t + offset_temp[SENSOR];
if (offset_hum[SENSOR] != 0) h = h + offset_hum[SENSOR];
if (t - stats[SENSOR*2] > 5 || stats[SENSOR*2] - t > 5) {
stats[SENSOR*2] = t;
stats[(SENSOR*2) + 1] = h;
if (_DEBUG) printf("Sensor %i: Temperature difference too big, waiting for second try\n", SENSOR);
return 0;
}
if (trigger_state[SENSOR] < 1 && t > stats[SENSOR*2] && t > trigger_high[SENSOR]) {
trigger_state[SENSOR] = 1;
char pushover_message[100];
sprintf(pushover_message, "Sensor %s:\n%.2f *C exceeds upper limit of %.2f *C\n", GPIO_LABEL[SENSOR], t, trigger_high[SENSOR]);
submit_pushover(pushover_message);
} else if (trigger_state[SENSOR] > -1 && (stats[SENSOR*2] == 0 || t < stats[SENSOR*2]) && t < trigger_low[SENSOR]) {
trigger_state[SENSOR] = -1;
char pushover_message[100];
sprintf(pushover_message, "Sensor %s:\n%.2f *C exceeds lower limit of %.2f *C\n", GPIO_LABEL[SENSOR], t, trigger_low[SENSOR]);
submit_pushover(pushover_message);
}
stats[SENSOR*2] = t;
stats[(SENSOR*2) + 1] = h;
return 1;
}
else {
if (_DEBUG) printf("Sensor %i: Data not good, skip\n", SENSOR);
return 0;
}
}
int main (int argc, char *argv[]) {
int k;
char name[20];
int value;
if (argc == 2) {
if (strcmp(argv[1], "-d") == 0) _DEBUG = true;
if (strcmp(argv[1], "-o") == 0) _OFFLINE = true;
} else if (argc == 3) {
if (strcmp(argv[1], "-d") == 0 || strcmp(argv[2], "-d") == 0) _DEBUG = true;
if (strcmp(argv[1], "-o") == 0 || strcmp(argv[2], "-o") == 0) _OFFLINE = true;
}
if (_DEBUG)
printf ("Raspberry Pi wiringPi DHT22 service\n");
for (k = 0; ini_getkey("sensors", k, name, 20, inifile) > 0; k++) {
strcpy(GPIO_LABEL[k], name);
value = ini_getl("sensors", name, -1, inifile);
GPIO_PIN[k] = value;
trigger_high[k] = (float)ini_getf(name, "upper", 25, inifile);
trigger_low[k] = (float)ini_getf(name, "lower", 20, inifile);
offset_temp[k] = (float)ini_getf(name, "offset_temp", 0, inifile);
offset_hum[k] = (float)ini_getf(name, "offset_hum", 0, inifile);
if (_DEBUG) {
printf("%s = GPIO %d\n", name, value);
printf("%s = High %.2f\n", name, trigger_high[k]);
printf("%s = Low %.2f\n", name, trigger_low[k]);
printf("%s = Offset Temp %.2f\n", name, offset_temp[k]);
printf("%s = Offset Hum %.2f\n", name, offset_hum[k]);
}
}
if (!_DEBUG) {
pid_t process_id = 0;
pid_t sid = 0;
process_id = fork();
if (process_id < 0) {
printf("fork failed!\n");
// Return failure in exit status
exit(1);
}
if (process_id > 0) {
printf("process_id of child process %d\n", process_id);
// return success in exit status
exit(0);
}
//unmask the file mode
umask(0);
//set new session
sid = setsid();
if (sid < 0) {
// Return failure
exit(1);
}
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
if (setuid(getuid()) < 0) {
perror("Dropping privileges failed\n");
exit(EXIT_FAILURE);
}
}
else
printf ("Sensor count = %i\n", k) ;
if (wiringPiSetup () == -1)
exit(EXIT_FAILURE);
int _state = 0;
while (1) {
if (_state == 10)
// Reading external sensor
_state = 10 + read_dht22_dat(1);
else if (_state == 1)
// Reading internal sensor
_state = (10 * read_dht22_dat(0))+1;
else {
// Reading both sensors
_state = (10 * read_dht22_dat(0))+read_dht22_dat(1);
}
if (_state == 11) {
// Successful read of both sensors
// printf("Sensor Data: %.2f *C %.2f %% %.2f *C %.2f %% \n", stats[0], stats[1], stats[2], stats[3]);
printf("Sensor Data (%s): %.2f *C %.2f %% \n", GPIO_LABEL[0], stats[0], stats[1]);
printf("Sensor Data (%s): %.2f *C %.2f %% \n", GPIO_LABEL[1], stats[2], stats[3]);
submit_thingspeak();
write_state(0);
write_state(1);
_state = 0;
if (_DEBUG) // break;
delayMicroseconds(10000000);
else
delayMicroseconds(300000000);
// sleep(300);
}
else {
// One of the sensors returned faulty data, retry after 50ms
delayMicroseconds(100);
}
}
return 0;
}