How do you send data from an online text file to arduino?

Using Arduino Project Guidance
1

Arduino Uno is connected to the computer I am working on.
I've created a txt file online using php.
I want to send the string to Arduino.
Do I need an Ethernet Shield to do that?

Thanks

2

You could use a serial terminal app to send the data to the Uno through the serial port. See the serial input basics tutorial.

Some terminal programs.
Realterm
Tera Term.
Or search for "free serial terminal".

3

I do not feel I have received an answer to my question.
I have a website. I created a php file that writes my visitors' inputs to a txt file.
I want my visitors to be able to connect either the php file to or the resulting txt file to their own Arduino.

I found an example on youtube that stores the inputs in a MySql database (so it would be very similar to what I have). But it uses an Ethernet Shield. Do I need this Shield to transfer the string?

I think that the link refers only to what is written to the Serial Monitor.

4

Some newer Arduinos incorporate wifi capability. Most of them don't. So you will have to add internet connectivity, either use one of the newer boards (or an ESP8266/ESP32), or an Arduino with an Ethernet or wifi hardware add on.

5

I do not feel I have received an answer to my question.

Sorry.

6

Magian:
I do not feel I have received an answer to my question.

That happened because you did not initially provide enough information, as suggested in the forum guides linked to in the sticky threads at the top of the forum.

7

"I do not feel I have received an answer to my question.
I have a website. I created a php file that writes my visitors' inputs to a txt file.
I want my visitors to be able to connect either the php file to or the resulting txt file to their own Arduino."

Are you perhaps thinking of a "text box" on a web page instead of a "txt file"?

8

No. Actually it is an array of integers, but I am sending a string that I am converting back in Arduino.
If sending one integer at a time (initially they were bits) is easier, then sure, that's ok too.
But wouldn't all cases (bits, integers, strings) require (or not require) an Ethernet shield?
Everything works. If I copy the string and paste it in Arduino it works. But I want to do it automatically.
If I save the array to a file or not is not so important.
When somebody presses a button in html I want php to send the info to their Arduino (the Arduino connected to the computer from which the button was pressed, the local computer I think it is called.
As I said earlier it is an Arduino Uno. Arduino Uno R3.

9

"But wouldn't all cases (bits, integers, strings) require (or not require) an Ethernet shield?"

As I understand your description, pretty much, or something similar.

10