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I want to make a project where there is a parking lot and a ir sensor which senses when a car comes and displays a message on lcd saying to insert a rfid card and then it opens a gate and there are many ir sensors in the slots to detect where there are cars and sends a message saying which slot is free.but the problem is many parts need the 5v pin but there is only one on the arduino board so i wanted to ask if any problem will occur if we connect multiple parts to one 5v pin if there will be a problem what is the work around.

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You can connect multiple devices or modules to the same 5v pin, as long as it does not exceed the maximum current that the on-board 5v regulator can handled. If you are using a genuine Arduino Uno, it has a NCP1117 which has a maximum current of 1A. If you don't have a genuine Arduino Uno, check the part number and find the datasheet to find out the maximum current.

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