I would like to ask if it is possible to connect a wired or wireless ready-made motion sensor with the Arduino Uno so that when motion is detected, it will send this information to the Arduino and it will for example activate the LED. I need this information for my college project.
You could not connect this directly to the Arduino Uno, as it looks like the output when triggered is based on the supply voltage. With some additional components (voltage divider or MOSFET switch) you could use this to provide 5v which would then be suitable.