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sh8nn0n_

@sh8nn0n_

Joined June 2nd, 2026

  • 4Devlogs
  • 2Projects
  • 1Ships
  • 15Votes
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I decided to learn Arduino this summer for fun. This is my first arduino project, where I used an rfid to detect the correct card that's being scanned, and if it's the right card, it'll open up a safe. If it's not the right card, the person will hear a loud buzzer.
Honestly the hardest part was doing the code since I only know basics of Python so a lot of my syntax was wrong but it was fun getting the rfid to work and also learning how to wire each component without needing help from external tutorials made me feel proud.

  • 4 devlogs
  • 0h build
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2h 40m 58s logged

I modeled what the box would look like with the electronics attached. I haven’t touched CAD in a while so I was a bit rusty but this is my vision for what the RFID would trigger.

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1h 6m 15s logged

EXCITING EXCITING!!
I got the servo to work with the rfid (so when I first scan my card the servo opens, and then the next time I scan my card the servo closes). I was able to do this by modifying Arduino’s example code for the servo to work for my own file (added an if else statement inside the if loop that happens when I scan the correct card). And then I decided to add a buzzer whenever the wrong card is scanned so whoever’s trying to break in gets a surprise sound.
Next I’m going to start doing the CAD for the case.

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1h 39m 47s logged

I did two things: (1) I used a total of 3k resistors to regulate the voltage coming from the 5v arduino board into 3.3v so that the rfid could read the pins. This allowed the example sketch to read the UIDs of the two cards I have. (2) I modified the example sketch to only grant access to one of the cards, and after much debugging and asking Gemini for help for debugging, I finally got the program to only accept one of the cards and not the other one!

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52m logged

First, I wanted to understand how the rfid works, so I used the example code for it, but then I ran into a board doesn’t exist error, and I FINALLY understood why my rfid-rc522 was giving me a does not exist error after I searched up a demo code that I then used.

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