College - Author 1

College of Engineering

Department - Author 1

Mechanical Engineering Department

Degree Name - Author 1

BS in Mechanical Engineering

College - Author 2

College of Engineering

Department - Author 2

Mechanical Engineering Department

Degree - Author 2

BS in Mechanical Engineering

College - Author 3

College of Engineering

Department - Author 3

Industrial and Manufacturing Engineering Department

Degree - Author 3

BS in Industrial Engineering

College - Author 4

College of Engineering

Department - Author 4

Electrical Engineering Department

Degree - Author 4

BS in Electrical Engineering

Date

6-2022

Primary Advisor

Jim Widmann, College of Engineering, Mechanical Engineering Department

Abstract/Summary

Maintaining and managing hundreds of locks and physical keys for an apartment complex can be time consuming and costly, especially when the apartments turn over to new tenants. Our goal was to develop a smart door lock that is compatible with Obodo’s management app for apartment complexes to make accessing apartments secure and simpler for tenants and easier to manage for owners.

We designed and manufactured one smart door lock that is powered with four AA batteries and utilizes a dynamic NFC device and Bluetooth technology. The board can enter a sleep mode which reduces power consumption. The dynamic NFC “wakes up” the bluetooth connection between the lock and phone to actuate the deadbolt. A dynamic NFC was chosen due to its short read range (0-3cm) which increases security. Additionally, it has the ability to act like a passive tag, allowing for phones to read and write to it making it compatible for both iPhones and Androids. For communication between the lock and controller, Wi-Fi is used in order to increase the range and allow for multiple locks to be used with one controller. Although we did not manufacture more than one lock, the electrical components selected have the capability of connecting multiple phones to one lock and multiple locks per controller.

The lock is also able to be locked and unlocked physically using the rack buttons, as well as the physical key as a failsafe mechanism. For this to be possible, we designed a clutch mechanism to disengage the motor gear train and the deadbolt shaft. Our clutch has two jaws that allows for 110° rotation before interfacing with the gear motor. Our end product serves as a prototype to show the functionality of the smart door lock and the communications for the lock and controller to work together. Our prototype will allow our sponsor to further develop it for high volume manufacturing so it can be implemented into student housing apartments in San Luis Obispo.

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