# dht22 Temperature Stats

## Raspberry Pi

### 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`

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, 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;` or `select * from average_stats;`

### 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
```


### ESP-8266
[aRest](https://github.com/marcoschwartz/aREST)


# Used sources

[cJSON](https://github.com/DaveGamble/cJSON)