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I've got 2 Raspberry Pi's:
I want to send data from the second one to the first when the circuit opens and make it visible on the website.
How could I do that?
As a beginner it may seem a bit taunting on how to actually transfer data, or how to ask the correct question on how to do it. The reason is because there are so many ways to do.
A popular way to be run a simple webserver on your "server". You can choose any language you like to run this simple webserver, python, node.js or C# MVC with API.
On the node, all you need to do is call the webserver on the specific URL.
You may want to use a WebAPI approach to make things simpler.
Server Nodes
http://pi/alarm/on <---WebRequest----< Make a webrequest
http://pi/alarm/off <---WebRequest----< Make a webrequest
The code behind the server and the nodes is up to you. Pick a language you would like to learn, Python being the best documented with samples for Rasbpain and C# for IoT - With tons of documentation and examples too.
Once you learn the basics, you can add data to a request. Like the name of the node, timestamps, or even post photos/video as binary.
There are dozens of ways of doing what you want. Only you can tell which are acceptable.
One possibility is to use my pigpio library.
You can write a script on the first Pi to control the GPIO on the second Pi.
The script on the first Pi can be conveniently written in Python or C.
The second Pi needs to be running the pigpio daemon.
