Arduino temperature and humidity sensor with sending and plotting (Part 1)

From the sandbox

The main objective of the project is to monitor the temperature in the greenhouse 11-15 meters away from the house. Without the possibility of organizing the laying of UTP and power to it.

Greenhouse part:

Take temperature / humidity with DHT-11 sensor using pro micro
Send fs1000a with pro micro

Home part:

Accept values on mx-rm-5v with Uno
Send to server using Ethernet shield (WIZNET W5100 ~~HR911105A~~ )
Write to mysql database
Draw a graph (jpgraph)

He started a little out of order. For me, this sequence was more complicated, so I decided to implement it first.

The list of required packages is not huge and depends on the distribution, namely nginx, php-gd, php-mysql, mysql-server. For jpgraph, ttf fonts may be needed.

Prepare nginx

server {
listen 80;
listen [::]:80;
root /var/www/html;
 location / {
               }
location ~ \.php$ {
    include fastcgi_params;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    # With php7.0-cgi alone:# fastcgi_pass 127.0.0.1:9000;# With php7.0-fpm:
    fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
    fastcgi_buffer_size 128k;
    fastcgi_buffers 256 32k;
    fastcgi_busy_buffers_size 256k;
    fastcgi_temp_file_write_size 256k;
    fastcgi_connect_timeout 1s;
    fastcgi_ignore_client_abort off;
    fastcgi_next_upstream timeout;
    fastcgi_read_timeout 5m;
    fastcgi_send_timeout 5m;
    }
}

For uno, we need the following libraries:
SPI.h
Ethernet.h
DHT.h

Code for UNO

#include <SPI.h>
#include <Ethernet.h>
#include <DHT.h>
// MAC address for controller
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
//Адрес шилда
byte ip[] = { 192, 168, 156, 192 };
//Маска
byte subnet[] = { 255, 255, 255, 0 };
//Шлюз
byte gateway[] = { 192, 168, 0, 1 };
//Адрес сервера с базой
char server[] = "192.168.156.186";
#define DHTPIN 2
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE); 
//Запуск клиента
EthernetClient client;
void setup() 
{
 dht.begin();
    Serial.begin(9600);
    while (!Serial) {
        ; // wait for serial port to connect
    }
{        Ethernet.begin(mac,ip,gateway,subnet);
    }
    // give the Ethernet shield a second to initialize
    delay(1000);
   }
void loop()
{
  if (client.connect(server, 80))
  {
  // give the Ethernet shield a second to initialize
  float h = dht.readHumidity();
  float t = dht.readTemperature();
         Serial.println("connected");
        // Отправляем GET запрос с данными
        client.println(String("GET /index.php?temp=")+ t +"&hum="+h);
           client.println();
        Serial.println("connection close");
      } else Serial.println("connection failed");
      delay(60000);
}

The sketch sends a GET request to the script (index.php) every minute:

index.php

<?php
/**
 * @param string            $message
 * @param PDOException|null $exception
 */
function writeMessage($message, $exception = null)
{
    $logfile = '/var/www/html/data/arduino.log';
    $datetime = date('d.m.Y H:i:s', time());
    if ($exception !== null) {
        $message .= ': ' . $exception->getFile() . ' (line: ' . $exception->getLine() . ') - ' . $exception->getMessage();
    }
    file_put_contents($logfile, '[' . $datetime . '] ' . $message."\n", FILE_APPEND);
}
/* Подключение к базе данных MySQL с помощью вызова драйвера */
$dsn = 'mysql:dbname=greenhouse;host=localhost';
$user = 'arduino';
$password = 'парол';
try {
    $dbh = new PDO($dsn, $user, $password, [
        PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
        PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8',
    ]);
} catch (PDOException $e) {
    writeMessage('Произошла ошибка', $e);
}
try {
    $sth = $dbh->prepare('INSERT INTO data (sensor, temperature, humidity, created_at) VALUES (?, ?, ?, NOW())');
    $sth->execute(['grass', $_REQUEST['temp'], $_REQUEST['hum']]);
} catch (PDOException $e) {
    writeMessage('Произошла ошибка', $e);
}

which in turn sends values to the database:

Table creation

CREATEDATABASE`greenhouse`DEFAULTCHARACTERSET utf8 COLLATE utf8_general_ci;

CREATETABLE`table` (
  `id`int(11) NOTNULL AUTO_INCREMENT,
  `sensor`varchar(255) DEFAULTNULL,
  `temperature`decimal(6,3) DEFAULT'0.00',
  `humidity`decimal(6,3) DEFAULT'0.00',
  `created_at` datetime DEFAULTNULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDBDEFAULTCHARSET=utf8 COLLATE=utf8_general_ci;

Add user and grant rights

CREATEUSER'arduino'@''' IDENTIFIED BY 'парол';

GRANT ALL PRIVILEGESON * . * TO'arduino'@'';

FLUSHPRIVILEGES;

We check:

select * fromdata;

+-----+--------+-------------+----------+---------------------+
| id  | sensor | temperature | humidity | created_at          |
+-----+--------+-------------+----------+---------------------+
|   1 | grass  |        NULL |     NULL | 2019-07-15 13:29:13 |
|   2 | grass  |      24.100 |   49.000 | 2019-07-15 13:44:44 |
|   3 | grass  |      24.100 |   49.000 | 2019-07-15 13:44:54 |
|   4 | grass  |      24.000 |   49.000 | 2019-07-15 13:45:04 |
|   5 | grass  |      24.000 |   49.000 | 2019-07-15 13:45:15 |
|   6 | grass  |      24.100 |   49.000 | 2019-07-15 13:45:25 |
|   7 | grass  |      24.100 |   49.000 | 2019-07-15 13:45:35 |
|   8 | grass  |      24.100 |   49.000 | 2019-07-15 13:45:45 |
|   9 | grass  |      24.100 |   49.000 | 2019-07-15 13:45:55 |
|  10 | grass  |      24.100 |   48.000 | 2019-07-15 13:46:47 |
|  11 | grass  |      24.100 |   48.000 | 2019-07-15 13:46:58 |
|  12 | grass  |      24.100 |   48.000 | 2019-07-15 13:47:08 |

Data in the database!

Install the JpGraph library ,

remove it in / var / www / src

Now we draw a graph (day.php):

day.php

<?php// content="text/plain; charset=utf-8"//define('__ROOT__', dirname(dirname()));require_once ('/var/www/src/jpgraph.php');
require_once ('/var/www/src/jpgraph_line.php');
require_once ('/var/www/src/jpgraph_error.php');
require_once ('/var/www/src/jpgraph_date.php');
$x_axis = array();
$y_axis = array();
$i = 0;
$con=mysqli_connect('localhost','arduino','парол','greenhouse');
$result = mysqli_query($con,"SELECT * FROM data");
while($row = mysqli_fetch_array($result)) {
$x_axis[$i] =  strtotime($row["created_at"]);
$y_axis[$i] = $row["temperature"];
    $i++;
}
    mysqli_close($con);
$start = time();
$end = $start+NDATAPOINTS*SAMPLERATE;
for( $i=0; $i < NDATAPOINTS; ++$i ) {
    $x_axis[$i] = rand(50,70);
    $xdata[$i] = $start + $i * SAMPLERATE;
}
$graph = new Graph(1000,400);
$graph->img->SetMargin(50,30,30,80);  
$graph->img->SetAntiAliasing();
$graph->SetScale('datlin');
$graph->xaxis->scale->SetDateFormat('d:m H:i');
$graph->SetShadow();
$graph->title->Set("Дневной график температуры");
$graph->xaxis->title->Set('время');
$graph->xaxis->SetLabelAngle(45);
$graph->yaxis->title->Set('температура');
$graph->xaxis->scale->SetTimeAlign(DAYADJ_1);
$graph->title->SetFont(FF_TIMES,FS_BOLD);
// Use 20% "grace" to get slightly larger scale then min/max of// data
$graph->yscale->SetGrace(0);
$p1 = new LinePlot($y_axis,$x_axis);
$p1->mark->SetType(MARK_FILLEDCIRCLE);
$p1->mark->SetFillColor("red");
$p1->mark->SetWidth(4);
$p1->SetColor("blue");
$p1->SetCenter();
$graph->Add($p1);
$graph->Stroke();