Check for finite numbers before inserting the data into the database; Link against math library; Updated Readme

README.md

@@ -1,7 +1,12 @@
 # dht22 Temperature Stats
 
+## Raspberry Pi
 
-## mySQL
+### Dependencies
+
+`apt install mariadb-server mariadb-client libmariadbclient-dev libmariadbclient-dev-compat libconfig-dev wiringpi libcurl4-openssl-dev (-s)`
+
+### mySQL
 
 Login: `mysql --user=root --password=password`
 
@@ -13,14 +18,40 @@ Create database: `create database dhtstats;`
 
 Use database: `use dhtstats`
 
-Create new table: `CREATE TABLE stats (id MEDIUMINT NOT NULL AUTO_INCREMENT, node_id int not null, pin int not null, humidity FLOAT NOT NULL, temperature FLOAT NOT NULL, isoutside int not null, gm3 float not null, created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (id) );`
+Create new table: 
+```
+CREATE TABLE stats (id MEDIUMINT NOT NULL AUTO_INCREMENT, node_id int not null, pin int not null, humidity FLOAT NOT NULL, temperature FLOAT NOT NULL, isoutside int not null, gm3 float not null, created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (id) );
+```
+and
+```
+CREATE TABLE average_stats (id MEDIUMINT NOT NULL AUTO_INCREMENT, humidity FLOAT NOT NULL, temperature FLOAT NOT NULL, gm3 float not null, isoutside int not null, created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (id) );
+```
+
+
+
 
 Show all entries in table: `select * from stats;`
 
-## Dependencies
+### Compile & Install
+
+To compile and install humidityPi use this oneliner: `make && make install` 
+
+### Configuration
+
+#### Settings
+
+The settings file ist located under `/etc/humiditypi/settings.cfg`
+
+#### Cronjob
+
+If you like to run humidityPi in a desired time intervall you can enable a cronjob by entering `crontab -e` and paste the following to the bottom of the text file:
+
+``` bash
+#Cronjob that will repeat every minute
+#Pipe the output to /dev/null to suppress mails from cron
+* * * * * humiditypi > /dev/null
+```
 
-### Raspberry Pi
-`apt install mariadb-server mariadb-client libmariadbclient-dev libmariadbclient-dev-compat libconfig-dev wiringpi libcurl4-openssl-dev (-s)`
 
 ### ESP-8266
 [aRest](https://github.com/marcoschwartz/aREST)