title: Blog
post: Arduino RFID door lock
date: 2019-06-20
comments: true
github: https://git.xythobuz.de/thomas/RFID-Door
---

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To avoid unwanted access to my old room, I saw the need to install some kind of additional door lock mechanism.
After taking a look around my parts-bin, I've settled on an RFID-based solution.

Luckily I still had a [serial RFID antenna from Conrad (TowiTek TWT2021)](https://www.conrad.com/p/rfid-antenna-towitek-twt2021-component-33-vdc-5-vdc-191553) lying around.
It simply outputs the ID of a transponder in reach on a serial output with 9600 baud as ASCII string.

Combined with a cheap [door-lock-solenoid from Amazon](https://www.amazon.de/gp/product/B00M2M3F74), a [relais-board](https://www.amazon.de/WINGONEER-KY-019-Relais-Shield-Arduino/dp/B06XHJ2PBJ) and a power-supply the project was basically completed.
To easily allow opening the door from the inside, I've added a small push-button that triggers the solenoid to the door-handle.

The code can be found [on my Gitea-Server](https://git.xythobuz.de/thomas/RFID-Door).

<div class="lightgallery">
    <a href="img/rfid_box.jpg">
        <img src="img/rfid_box_small.jpg" alt="">
    </a>
    <a href="img/rfid_setup.jpg">
        <img src="img/rfid_setup_small.jpg" alt="">
    </a>
    <a href="img/rfid_button.jpg">
        <img src="img/rfid_button_small.jpg" alt="">
    </a>
    <a href="img/rfid_solenoid.jpg">
        <img src="img/rfid_solenoid_small.jpg" alt="">
    </a>
</div>