NEW: #1 Mysql support, makefile and readme update, sensor struct update

README.md

@@ -1 +1,20 @@
-# dht22 Temperature Stats
+# dht22 Temperature Stats
+
+
+## mySQL
+
+Login: mysql --user=root --password=password
+
+Creating new user: create user 'dhtuser'@'localhost' IDENTIFIED BY 'raspberry';
+
+Permissions: grant all privileges on *.* to 'dhtuser'@'localhost';
+
+Create database: create database dhtstats;
+
+Use database: use dhtstats
+
+Create new table: CREATE TABLE stats (id MEDIUMINT NOT NULL AUTO_INCREMENT, pin int not null, humidity FLOAT NOT NULL, temperature FLOAT NOT NULL, created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (id) ); 
+
+## Dependencies
+
+sudo apt-get install libmysqlclient-dev libmysqld-dev mysql

dht22.c

@@ -31,12 +31,12 @@ static uint8_t sizecvt(const int read)
     return (uint8_t)read;
 }
 
-static int read_dht22_dat(int pin, sensor *s)
+static int read_dht22_dat(sensor *s)
 {
     uint8_t laststate = HIGH;
     uint8_t counter = 0;
     uint8_t j = 0, i;
-    DHTPIN = pin;
+    DHTPIN = s->pin;
     
     dht22_dat[0] = dht22_dat[1] = dht22_dat[2] = dht22_dat[3] = dht22_dat[4] = 0;
     

dht22.h

@@ -1,9 +1,15 @@
+#ifndef dht22_H
+#define dht22_H
 
-
+#include <stdint.h>
 
 typedef struct {
+    int pin;
     float humidity;
     float temperature;
 } sensor;
 
-void getData(int pin, sensor *s);
+void getData(sensor *s);
+//static int read_dht22_dat(int pin, sensor *s);
+//static uint8_t sizecvt(const int read);
+#endif

main.c

@@ -3,6 +3,8 @@
 #include "dht22.h"
 #include <stdlib.h>
 #include <unistd.h>
+#include "sendmysql.h"
+
 int main(void) {
     if (wiringPiSetup () == -1)
         exit(EXIT_FAILURE) ;
@@ -14,8 +16,11 @@ int main(void) {
     }
     
     sensor data;
-    
+    data.pin = 7;
-    getData(7, &data);
+    getData(&data);
     printf("%.2f, %.2f\n", data.temperature, data.humidity);
+
+    insertData(&data);
+
     return 0;
 }

makefile

@@ -3,11 +3,11 @@
 
 VERSION = 1.0
 CC      = /usr/bin/gcc
-CFLAGS  = -Wall -g -D_REENTRANT -DVERSION=\"$(VERSION)\" 
+CFLAGS  = -Wall -g -D_GNU_SOURCE -D_REENTRANT -DVERSION=\"$(VERSION)\" `mysql_config --cflags`
 #LDFLAGS = -lm -lpthread `gtk-config --cflags` `gtk-config --libs` -lgthread
-LDFLAGS = -lwiringPi
+LDFLAGS = -lwiringPi `mysql_config --libs`
 
-OBJ = main.o dht22.o
+OBJ = main.o dht22.o sendmysql.o
 
 dht22: $(OBJ)
 	$(CC) $(CFLAGS) -o dht22 $(OBJ) $(LDFLAGS)

sendmysql.c

@@ -0,0 +1,61 @@
+ /* Simple C program that connects to MySQL Database server*/
+#include <mysql/mysql.h>
+//#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include "sendmysql.h"
+
+void insertData(sensor *s) {
+   MYSQL *conn;
+   //MYSQL_RES *res;
+   //MYSQL_ROW row;
+
+   char *server = "localhost";
+   char *user = "dhtuser";
+   char *password = "raspberry"; /* set me first */
+   char *database = "dhtstats";
+
+   conn = mysql_init(NULL);
+
+   /* Connect to database */
+   if (!mysql_real_connect(conn, server,
+         user, password, database, 0, NULL, 0)) {
+      fprintf(stderr, "%s\n", mysql_error(conn));
+      exit(1);
+   }
+    
+    /*
+   // send SQL query 
+   if (mysql_query(conn, "show tables")) {
+      fprintf(stderr, "%s\n", mysql_error(conn));
+      exit(1);
+   }
+
+   res = mysql_use_result(conn);
+
+   // output table name 
+   printf("MySQL Tables in mysql database:\n");
+   while ((row = mysql_fetch_row(res)) != NULL)
+      printf("%s \n", row[0]);
+    */
+   
+    char *pquerystring = NULL;
+
+    if (-1 == asprintf(&pquerystring, 
+    "INSERT INTO stats (pin, humidity, temperature) VALUES (%i, %f, %f)", s->pin, s->humidity, s->temperature)) {
+        perror("asprintf() failed");
+    } else {
+        if (mysql_query(conn, pquerystring)) {
+            fprintf(stderr, "%s\n", mysql_error(conn));
+            exit(1);
+        }
+    }
+
+    free(pquerystring);
+    pquerystring = NULL;
+    
+   /* close connection */
+   //mysql_free_result(res);
+   mysql_close(conn);
+}
+

sendmysql.h

@@ -0,0 +1,3 @@
+#include "dht22.h"
+
+void insertData(sensor *s);