Can somebody help me out as I can't see the answer to my problem.
I'm running an Ethernet Shield with a thermistor and wish to add the values to a mysql database. I know the php script works as I can insert a number instead of (celsius)"); and then run the script and the number appears in the database. My problem is with the sketch which works accept it wont pass the data to the php file which lives at /var/www/ard_log/update.phpThermometer0()
Here is the sketch:
#include <SPI.h>
#include <WString.h>
#include <Ethernet.h>
#define READING_PIN 0
/*
Simple Ethernet Test
Arduino server outputs simple text to browser
The circuit:
* Arduino Duemilanove
* Arduino Ethernet shield
* Basic FTDI breakout 5V
*LED connected to GND and digital pin 4 via resistor
By Minde
http://www.sciencprog.com/
*/
byte mac[] = { 0x90, 0xA2, 0xDA, 0x00, 0x11, 0xAC }; //physical mac address
byte ip[] = { 192, 168, 1, 19 }; // ip in lan
byte gateway[] = { 192, 168, 1, 1 }; // internet access via router
byte subnet[] = { 255, 255, 255, 0 }; //subnet mask
Server server(80); //server port
byte sampledata=50; //some sample data - outputs 2 (ascii = 50 DEC)
int ledPin = 4; // LED pin
char link[]="http://www.scienceprog.com/"; //link data
String readString = String(30); //string for fetching data from address
boolean LEDON = false; //LED status flag
//#################################################
double R1 = 10000.0; //resistance put in parallel
double V_IN = 5.0;
double A = 1.129148e-3;
double B = 2.34125e-4;
double C = 8.76741e-8;
double K = 9.5; // mW/dec C – dissipation factor
double SteinhartHart(double R)
{
// calculate temperature
double logR = log(R);
double logR3 = logR * logR * logR;
return 1.0 / (A + B * logR + C * logR3 );
}
//#################################################
void setup(){
//start Ethernet
Ethernet.begin(mac, ip, gateway, subnet);
//Set pin 4 to output
pinMode(ledPin, OUTPUT);
//enable serial datada print
Serial.begin(9600);
}
void loop(){
// Create a client connection
Client client = server.available();
if (client) {
while (client.connected()) {
//#############################################
double adc_raw = analogRead(READING_PIN);
//Serial.println(adc_raw);
double V = adc_raw / 1024 * V_IN;
//calculate resistance
double R_th = (R1 * V ) / (V_IN - V);
double kelvin = SteinhartHart(R_th) - V*V/(K * R_th);
int celsius = kelvin - 273.15;//was double but changed to int to remove decimal places
Serial.print(celsius);
Serial.println();
client.print("Temp.");
client.print(" is ");
client.print(celsius);
client.println(".C");
client.println("GET /http://192.168.1.20/ard_log/update_db.php?celsius=");
client.println(celsius);
client.println(" HTTP/1.1\r\n");
client.println("Host: http://192.168.1.20");
client.println();
delay(1000);
//##############################################
//clearing string for next read
readString="";
//stopping client
client.stop();
}
}
}
and here is the php:
<?php
//Connect to database
$con = mysql_connect("xxxx", "xxxx", "xxxx");
if(!$con)
{
die('Could not connect: ' .mysql_error());
}
mysql_select_db("1stClassElec", $con);
mysql_query("INSERT INTO device_1(temp) VALUES (celsius)");
mysql_close($con);
?>
Any help would be appreciated as I've spent hours on this problem
Think you are messing up Client and Serial ... Keep them separated!
update: (looking again at your code made me wonder)
Do you intend to let the Arduino act as a server from which data can be GET?
or do you intend to let the Arduino act as a Client that POST data to another webserver.
while (client.connected())
{
// keep it simpler ..
int celsius = 100;
Serial.println();
[glow]client[/glow].print("Temp."); // Serial??
[glow]client[/glow].print(" is ");
[glow]client[/glow].print(celsius);
[glow]client[/glow].println(".C");
client.print("[glow]POST [/glow]/http://192.168.1.20/ard_log/update_db.php?temp=");
client.print(celsius);
Serial.print("[glow]GET [/glow]/ard_log/update_db.php?temp="); // [glow]GET vs POST difference[/glow]
I imagine I need a client as my idea was to have the Arduino write to the mysql database, there could be more than one Arduino sending the same sort of data. When I wish to view any results I would just read the results from the database in a web page.
The Serial.print was only to check to right data was being sent but I've just tried GET and Post but still nothing appears in the database.
I still don't understand why nothing is written to the database.
First you have to fix the webserver to work properly. Build two php pages, one with a form in which you can fill in two fields - time and temperature - and a second one to process the data posted and stores it into a database.
have the Arduino send data direct to the mysql database?
That it can not do. There is nothing in MySQL that listens to the serial port. You can have the Arduino with Ethernet shield do GET, PUT, or POST, depending on which is easier for you to understand/get working. Some other application, like a PHP script, needs to get the data, and construct the SQL commands to insert the data in the database.
Perhaps I've confused things more than I'm confused.
I'm trying to send data using client.print via ethernet from an Arduino client to my home web server which runs on a laptop. The serial.print is just so I can see what's happening using the "Serial Monitor".
I'm trying to get the Arduino to pass data to update_db.php which should load it into the database 1stClassElec table device_1.
I'm trying to send data using client.print via ethernet from an Arduino client to my home web server which runs on a laptop. The serial.print is just so I can see what's happening using the "Serial Monitor".
I'm trying to get the Arduino to pass data to update_db.php which should load it into the database 1stClassElec table device_1.
Well, the issue may not be with the arduino, but with the setup on your server. Below is some arduino ethernet test code that sends a GET request to my apache web server for the contents of the text file, and the apache web server sends the text of the file back to the arduino to verify that the ethernet shield is working. You could append your data to the URL as a query_string to send to your server. You will have to develop the data handling programs for your server.
//zoomkat 11-13-10
//simple ethernet client test code
//for use with IDE 0021 and W5100 ethernet shield
//modify the arduino lan ip address as needed
//open serial monitor to see what the arduino receives
//push the shield reset button to run client again
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 192, 168, 1, 102 };
byte server[] = { 208, 104, 2, 86 }; // zoomkat
Client client(server, 80);
void setup()
{
Ethernet.begin(mac, ip);
Serial.begin(9600);
Serial.println("starting simple arduino client test");
Serial.println();
delay(1000);
Serial.println("connecting...");
if (client.connect()) {
Serial.println("connected");
client.println("GET /~shb/arduino.txt HTTP/1.0");
client.println();
} else {
Serial.println("connection failed");
}
}
void loop()
{
if (client.available()) {
char c = client.read();
Serial.print(c);
}
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting.");
Serial.println("==================================");
Serial.println("");
client.stop();
for(;;);
}
}
zoomkat, thanks for info. I've created file below, please check it through in case I'm making a mistake.
//zoomkat 11-13-10
//simple ethernet client test code
//for use with IDE 0021 and W5100 ethernet shield
//modify the arduino lan ip address as needed
//open serial monitor to see what the arduino receives
//push the shield reset button to run client again
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = {0x90, 0xA2, 0xDA, 0x00, 0x11, 0xAC };
byte ip[] = { 192, 168, 1, 19 };
byte server[] = { 192,168,1,20 }; // zoomkat
Client client(server, 80);
void setup()
{
Ethernet.begin(mac, ip);
Serial.begin(9600);
Serial.println("starting simple arduino client test");
Serial.println();
delay(1000);
Serial.println("connecting...");
if (client.connect()) {
Serial.println("connected");
client.println("GET /http://192.168.1.20/var/www/arduino.txt HTTP/1.0");
client.println();
} else {
Serial.println("connection failed");
}
}
void loop()
{
if (client.available()) {
char c = client.read();
Serial.print(c);
}
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting.");
Serial.println("==================================");
Serial.println("");
client.stop();
for(;;);
}
}
and the responce I get back
starting simple arduino client test
connecting...
connected
HTTP/1.1 404 Not Found
Date: Sat, 18 Dec 2010 08:57:55 GMT
Server: Apache/2.2.14 (Ubuntu)
Vary: Accept-Encoding
Content-Length: 312
Connection: close
Content-Type: text/html; charset=iso-8859-1
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL /http://192.168.1.20/var/www/arduino.txt was not found on this server.</p>
<hr>
<address>Apache/2.2.14 (Ubuntu) Server at 127.0.1.1 Port 80</address>
</body></html>
disconnecting.
==================================
The arduino.txt file does exist.
I hope someone can help, thanks.
If so what is wrong with my code which stops me writing to the database?
The arduno is working just fine. The issue is on your server and what application you are using with apache to interpet what is sent and the manipulaton of your database. If the server is on a linux box, then you need to have some linux compatable application to perform the database operations when apache gets the incomming request. In the past I think Perl was often used as a CGI application. PHP might have a version for linux.
You might post your PHP code that works to see what you have. Below shows how to append a GET request (query_string, the string after the ?) to a URL. In windows, apache sets the query_string as an environmental varable, from which an application started by apache collects the data. Note that some characters have special meaning and can't be put in a query_string.
Well this is what I'm trying to run. The Arduino code is yours, modified to update the database with a value.
//zoomkat 11-13-10
//simple ethernet client test code
//for use with IDE 0021 and W5100 ethernet shield
//modify the arduino lan ip address as needed
//open serial monitor to see what the arduino receives
//push the shield reset button to run client again
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = {0x90, 0xA2, 0xDA, 0x00, 0x11, 0xAC };
byte ip[] = { 192, 168, 1, 19 };
byte server[] = { 192,168,1,20 }; // zoomkat
Client client(server, 80);
void setup()
{
Ethernet.begin(mac, ip);
Serial.begin(9600);
Serial.println("starting simple arduino client test");
Serial.println();
delay(1000);
Serial.println("connecting...");
if (client.connect()) {
Serial.println("connected");
//client.println("GET /arduino.txt HTTP/1.0");
client.println("GET /update_db.php?celsius=18 HTTP/1.0");
client.println();
} else {
Serial.println("connection failed");
}
}
void loop()
{
if (client.available()) {
char c = client.read();
Serial.print(c);
}
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting.");
Serial.println("==================================");
Serial.println("");
client.stop();
for(;;);
}
}
And the PHP script
<?php
//Connect to database
$con = mysql_connect("localhost", "xxxx", "xxxx");
if(!$con)
{
die('Could not connect: ' .mysql_error());
}
mysql_select_db("1stClassElec", $con);
mysql_query("INSERT INTO device_1(temp) VALUES (celsius)");
mysql_close($con);
?>
NOTE:
If I change mysql_query("INSERT INTO device_1(temp) VALUES (celsius)");
to
mysql_query("INSERT INTO device_1(temp) VALUES (19)");
and then run Arduino the value of 19 gets written into the database.
Whymysql_query("INSERT INTO device_1(temp) VALUES (celsius)"); doesn't pass its value of celsius=18 from the Arduino script is a mystery to me at the moment.
In the PHP script, there are $_GET and $_POST variables that contain the data passed to the script, depending on the method used to to activate the script.
The $_GET variables are name/value pairs. The value is obtained from the name:
$val = $_GET['celcius'];
It is the value ($val) that you want to store in the database.