Transcript
Spring 2016 ECE 445 Project Proposal
Smart Lock With Smart Keys Boyu Li Yujia Dong Jiexin Lyu
Table of Content 1.0 Introduction 1.1 Title 1.2 Motivation 1.3 Objectives
2.0 Design 2.1 Block Diagram 2.2 Block Description
3.0 Requirements and Verification 3.1 Requirements 3.2 Verification
4.0 Tolerance Analysis 5.0 Cost and Schedule
1.0 Introduction 1.1 Title: Smart Key with Smart Lock Privacy and safety matters more and more as technology advances. Carrying multiple keys around, and be present when giving access are sometimes inconvenient, especially when you have many guests or have multiple rental properties. We want to solve this problem by designing an invisible set of lock and keys that allows user to unlock their locks, or give access to other people they trust anywhere at anytime.
1.2 Motivation: Safety and privacy is a big issue for all of us. Imagine when you are living with a roommate in the same dorm room or you are at work with your coworker in the same office, sometimes you want to keep your private stuffs in a drawer. However, it is not ideal to put a physical lock on the drawer, which makes it obvious that you have something valuable stored in this drawer and you don’t trust the person who’s in the same space with you. Also, sometimes when we are away from home, and we need to give access to a guest, a babysitter or a constructor, but we couldn’t open the door for them unless we actually present at home. In addition, there are situations where we drove several miles away, and suddenly remember that we forgot to lock the door/drawer. Another inconvenience of current lock is that sometimes you might forget to bring the key or cannot remember where the key is located. This is an annoying situation and we need some way to make the key “invisible”, in other words, abandon the physical key. All of the problems indicate that we need to develop some kind of smart locks that allow users to open the lock ni multiple ways. The existing solutions for keyless lock includes Bluetooth LE, NFC, RFID, etc. But there isn’t a product that combines the three methods together. Our motivation is to combine three of the existing solutions above (NFC, WIFI, pattern) together and build a smart lock. The lock allows user to manage user access, track usage activity, and unlock their lock with smart phone. In addition, the lock would not be used only for doors, but also for drawers, cabinets or closets, wherever needs a lock. And it will be installed on the interior, so no one would notice the lock from outside, which provides more privacy and safety.
1.3 Objectives ● Goals and benefits ○
Users can monitor their lock status anytime at anywhere, ensures safety and privacy
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Keyless unlock feature: use the NFC chip built in the smart phone or the mobile app with wifi connection
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Alternative unlock feature: knock a preset secret pattern, so user don’t have to worry about no wifi connection or phone is out of power
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Easier to give access to multiple people, by just sharing the key on app / sharing the secret knock pattern
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Easier to manage several rental properties
● Functions and Features ○ Sends alarm message to user’s phone when someone tries to open the lock and failed
○ Allows users to share keys with friends or guests instantly with the app while they are away
○ Sends user confirmation messages that who has opened your lock at what time ○ Lock would automatically latches (and update status on your app) so user never has to worry about forgetting to lock it ○
Lock is on the interior of doors/drawer and is invisible from outside
2.0 Design 2.1 Block Diagram:
2.2 Block Description: The diagram consists of four major components: 1. Control Part This part is the controller by the user to control the locker activity. The functionality of this part is making the setting for the lock more user friendly. There are two components that can realize the user control. 1.1 Mobile App When using the mobile app, user can enter the correct password to unlock the device. 1.2 BlueTooth LE The BlueTooth LE will realize the unlock function that when locker’s device can match the user’s bluetooth LE. 2. Processing This part is the processing part for the lock which means process the external signal including the user instructions and vibration instruction. There are three parts that help us recognize the external instruction and process it then send feedback to microcontroller. 2.1 Vibration Detector This vibration detector will detect the external knocking and recognize it. 2.2 Wifi
First of all, the wifi will be the used in the password unlock which corresponds to mobile app unlock function. Secondly, the wifi will be used when the device is unlocked, it will send notification to user’s mobile. 2.3 BlueTooth The bluetooth in the device will be used to pair with the bluetooth LE in the user’s mobile to unlock the device. 3. MicroController The key part for the lock, in this part, we will realize the functionality that based on the processed instruction from processing part, it will give the corresponding feedbacks which are wellprogrammed. 4. Execution This part we call it execution part which means that it will do the corresponding activity based on the incoming feedback from microcontroller, such as unlocking the device (successfully unlock) or generating alarm(suspicious attemptation). And the overall power resource will also be included in this part.
3.0 Requirements and Verification 3.1 Requirements: Requirement 1. Arduino Uno a. Functionality: The microcontroller is for recognizing knock pattern and link to the Bluetooth LE b. Technical Detail ● Operating voltage: 5v ● Input voltage 620v ● Dig ital IO pins: 14 (of which 6 provide PWM output) ● DC current per I/O pin: 20mA
Verification 1. Use potentiometer and LED to sweep AI/O. Use switch and LED to test DI/O. Ensure AI/O functions for full 5V range and DI/O functions at 5V 2. If equipment functions properly, test methods in libraries under known conditions. Ensure precision within device specs. 3. Measure current: Iin ≤ 100 mA
2. Lockstyle solenoid a. Functionality : The electromagnets based solenoids, when the coil is energized, the slug is pulled into the center of the coil which makes the solenoid able to pull from one end. b. Technical Details : i. 12VDC; ii. 650mA at 12V when activated; iii. Designed for 110 seconds activation time
1. Use multimeter to test volts, current, and resistance
3. Piezo buzzers a. Functionality : Used for making beeps, tones, and alerts . b. Technical Detail: i. Driven by 330V peaktopeak square wave. ii. Can be adjusted from 2KHz to 10KHz. Loudest sound at 4KHz.
1. Use the microcontroller to drive the buzzer with two port pins pushpull, and so get almost 10V peaktopeak drive from a 5V supply. 2. The buzzer should produce the desired audio frequency
4. TIP power Darlington Transistor a. Functionality :Transistor that control medium to highpower electronics, in our design which are motors, solenoids. etc. b. Technical Detail i. They can switch up to 60V at peak
1. Use multimeter to test volts, current and resistance
ii.
current of 8A and continuous current of 5A. With DC gain about 1000.
5. Power supply a. Functionality : The power supply for the lock b. b. Technical Detail i. 12 V up to 1000mA(1 Amp) of current draw. ii. 5.5mm/2.1mm barrel jack. 6. Bluefruit LE Bluetooth Low Energy (BLE 4.0) nRF8001 a. Functionality : Bluetooth connection between ios devices and the lock b. b. Technical Detail i. Dimensions: 29mm x 28mm / ii. iii.
1.14" x 1.10" 0.8mm thick / .03" Weight: 1.8g
1. Use the voltage meter to detect to make sure that the voltage is our anticipated voltage
1. Use Oscilloscope to test its fully functional work. 2. Use the different bluetooth LE to guarantee that the wrong pair bluetooth will not unlock the device.
3.2 Verification: 3.2.1 Equipment: The testing equipments including oscilloscope, multimeter, LED, etc, details will be provided in the chart above. 3.2.2 Test Procedures: Functionalities Testing: I.
Knock Pattern Test: Knock the drawer with specific patterns, the lock will open. If the pattern is incorrect, the lock will not open.
II.
Knock Speed Test: Knock the drawer in different speed to test the upper and lower bound of recognizable knocking pace.
III.
App Test: Use mobile app to unlock the lock
IV.
Bluetooth Test: Pair a cell phone and use Bluetooth NFC to unlock
V.
Alert Test: Try knock with wrong pattern multiple times (the number of tries will be set to 510), and enter wrong unlock passcode on mobile mobile app with multiple times. To test the alert system (The system will beep or make an alert sound)
VI.
Breakprevent Test: If someone tries to break the lock, the lock will shut down automatically (be careful with this test because it is fatal)
Support Test: I.
Set Passcode Test: First time users will be asked to pair the locker on mobile device (via mobile app). Users need to enter their mobile phone number and email address, then set the passcode on mobile app.
II.
Set Knocking Pattern Test: Set knocking pattern via mobile app or on locker itself.
III.
Bluetooth Pair Test: Pair a mobile device (iPhone6 or newer version) with the locker.
IV.
Retrieve Passcode Test: If the user has forget the passcode on mobile app, the user are able to retrieve the passcode via mail.
V.
Retrieve Knocking Pattern Test: User can retrieve their knocking pattern via mobile app or bluetooth. The system will send a message or email to the user with the knocking
pattern, or users are able to get their knocking pattern on the mobile app.
4.0 Tolerance Analysis To recognize the knock frequence, we need to make sure that our recognize system can tell the difference between the correct pattern and some randomly knock. The device we are planning to use is piezo buzzer and sometimes piezo buzzer might not be smart enough to recognize some pattern. For example, if you knock the drawer to fast (the time gap between two knocks are too short). The buzzer might not be able to recognize that they are two distinct knocks. User need to knock with a specific pattern ,in a specific pace. This might affect the performance because different users have different knocking preference. Later in the lab we are going to test the performance of the piezo buzzer with different knocking speed, from low to high and determine a safe speed range for the buzzer to recognize the pattern successfully.
5.0 Cost and Schedule 5.1 Cost: 5.1.1 Device Cost: All the devices we use for this project will not be too pricy. The Arduino Microcontroller and some resistors, as well as some testing and debugging devices will be available from ECE445 lab. Other devices, including piezo buzzer, Bluetooth LE, NFC, will be around 1030 bucks each. The total cost for devices for this project will be around 100 dollars. 5.1.2 Labor Cost: Each of us will devote decent amount of time on this project, the estimated amount of time we are going to work on this is: Name
Hours/week
Yujia Dong
8hrs/week
Boyu Li
8hrs/week
Jiexin Lyu
8hrs/week
Total
24hrs/week
5.2 Schedule Time
Task
Responsibility
2/15/2016
Work on Mock Design Review. Submit Eagle Assignment
Boyu, Yujia, Jiexin
2/22/2016
Work on design and Boyu, Yujia, Jiexin implementation of PCB. Submit Soldering Assignment
2/29/2016
Continue on work on PCB. Start to work on bluetooth. Design Review
Boyu, Yuija, Jiexin
3/7/2016
Implement bluetooth NFC feature
Boyu, Yuija, Jiexin
3/14/2016
implement vibration unlock feature
Boyu, Yujia, Jiexin
3/21/2016
Spring Break
3/28/2016
Modify R&V Table. Finish testing for bluetooth and vibration functionalities
Boyu, Yuija, Jiexin
4/4/2016
Work on Wifi feature and mobile app development
Boyu, Yuija, Jiexin
4/11/2016
Finish Wifi functionality, including support features like sending email and message. Mock Demo
Boyu, Yuija, Jiexin
4/18/2015
Finish the whole project, fully test all the functionalities
Boyu, Yuija, Jiexin
4/25/2015
Demo. Work on report paper
Boyu, Yuija, Jiexin
5/2/2015
Final paper finish and submit Boyu, Yuija, Jiexin
