Easy way to get data from Arduino to web page?

Projects Programming
1

Is there easy way to put data from Arduino on web page?
I'm thinking of writing PHP script, which calls C# program, which communicates with Arduino.
So far i'm ok with sending data to Arduino, but what about receiving data?
Can i use C# to send data from specific port back to PHP and display it?

2

Generally speaking, if the arduino is to provide data to a requesting client, a server application is run on the arduino. If the arduino is to on its own to supply data to a server some where, a client application is run on the arduino. "Get" request seem to be the easiest way to pass limited data to/from an arduino.

3

POST isn't too much harder, and is technically more correct, given that you are likely to make some state change based on the Arduino data.

POST /arduino.php HTTP/1.1
Host: myhost
Content-Length: 29
Content-Type: application/x-www-form-urlencoded

pin2=HIGH&pin3=LOW&pin5=HIGH

This presumes you have some Ethernet hardware connected to your Arduino of course, to act as the server or client in this situation.

4

Are you using an Ethernet (or WiFi) shield, or do you plan to have your Arduino connected to a PC via USB/Serial?

5

No, no aditional shields.
I would like to read data only via USB connection. That's why i decided to get it with C#, but i'm not shure how to send them into php...
Like i said, PHP->C#->Arduino works ok, but i have no idea how to do it in reverse. Maybe i could write file (xml?) with C#, and read it with PHP.

6

That you are referring to C# and PHP together implies that you are using a Windoze operating system. The PHP serial class on Windoze has a serious deficiency (that seems to be unresolvable with an OS change that isn't likely to be made) that prevents it from reading from the serial port. So, PHP --> Arduino is possible, but Arduino --> PHP isn't.

7

I would like to read data only via USB connection.

Any language which supports serial ports can talk to the Arduino.

Alternatively you can use a virtual serial port to communicate with the Arduino over a network socket.

serproxy: http://www.lspace.nildram.co.uk/freeware.html
Null modem: http://com0com.sourceforge.net/

Both are free and both make it a little bit easier to deal with newer languages that do not have robust serial support (I'm looking at you PHP.)

8

(that seems to be unresolvable with an OS change that isn't likely to be made)

It is not an OS problem, it is a PHP problem. PHP was made to do file handling and not to do hardware IO. :roll_eyes: