I wanted to capture data from the DHT11 and save it remotely into a DB. It can be used to send anything to a GET page. I didn’t put the function to get the temperature but I can if you ask me.
Some parameter need to be changed:
– YOUR_IP => XX.XX.XX.XX
– YOUR_IP_WITH_COMA => XX,XX,XX,XX
– YOUR_MAC_HEXA_WITH_COMA => 0xYY, 0xYY, 0xYY, 0x0E, 0x0C, 0xYY
#include <Ethernet.h> #include <SPI.h> #include "DHT.h" #define DHTPIN 9 #define DHTTYPE DHT11 float h = 0; float t = 0; byte mac[] = {YOUR_MAC_HEXA_WITH_COMA}; IPAddress serverSQL(YOUR_IP_WITH_COMA); EthernetClient sql; DHT dht(DHTPIN, DHTTYPE); void setup() { Serial.begin(9600); Serial.println("Starting..."); Ethernet.begin(mac); dht.begin(); } void loop() { readTempHum(); delay(1000); } void get_request(float t, float h) { Serial.println("Connecting to Client..."); if (sql.connect(serverSQL, 80)) { // Make a HTTP request: sql.print("GET http://YOUR_IP/get.php?t="); sql.print(t); sql.print("&h="); sql.println(h); sql.println("HTTP/1.1"); sql.println(); Serial.println("Request sent!"); sql.stop(); } else { Serial.println("Client Connection Failed!"); } } // Show temp & humidity in the console // & send it to the DB void readTempHum() { h = dht.readHumidity(); t = dht.readTemperature(); if(isnan(t) || isnan(h)) { Serial.println( "Reading error!"); } else { Serial.print("Humidity :"); Serial.print(h); Serial.print(" %\t"); Serial.print("Temperature :"); Serial.print(t); Serial.println(" *C"); get_request(t,h); } } |
The php part
<!--?php define("DB_HOST","XXXX"); define("DB_USER","XXXX"); define("DB_PASS","XXXX"); define("DB_NAME","XXXXX"); $GLOBALS['con_db'] = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME) or die(exit()); $GLOBALS['con_db']--->set_charset("utf8"); $GLOBALS['con_db']->query("INSERT INTO historic VALUES(NULL,'".intval($_GET['t'])."','".intval($_GET['h'])."',CURRENT_TIMESTAMP);") or die($GLOBALS['con_db']->error . __LINE__); $GLOBALS['con_db']->close(); ?> |
The MySQL part:
CREATE TABLE IF NOT EXISTS `historic` ( `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT, `temperature` INT(11) NOT NULL, `humidity` INT(11) NOT NULL, `date` datetime NOT NULL, UNIQUE KEY `id_2` (`id`), KEY `id` (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ; |
HI
Could you please kindly publish the entire code. I am trying to accomplish the same, however there is not much on the net with regards to using MySQL along with a DHT11 sensor.
Hi,
I updated the article with the entire Arduino code. If it doesn’t answer your question, could you be more specific?
Don’t forget to import the library in the arduino software: Sketch/Import Library/Add Library
Hope it helps
Hello
I try yours codes and I have some difficulties. Please help.
I can’t seem to get it to work. Is there a syntax error in the PHP or what?