In the last few days I made some researches about a RFID-Reader. For my job I need to fix a problem with a log in at a machine. In our company,  every employer had an access card and that I want to use. After I had found out what kind of card it is and what frequency it use I ordered an Arduino Uno board and a RFID-RC522 unit.

That the parts can communicate together, I you must connect it together at first. I solder everything together. To get everything safe for testing, I screw it on a PET plate. It looks like this from.

Now it must be programed. For the RC522 is were an existing C Class. There you haven't to do anything. You only have to include it in an existing project and you can start directly and read the cards.

The cost for an Arduino Uno and the RC522 are around 30€. The part are working fine. After the tests I include it in my own project and can compare the card number to our database to check that the user have the rights to start a machine or not. With other words, the machine only will start if the user have the right for it.

It was a nice small test that fix a problem in an easy way.