Knocker Unlocker JACOB GILBERT | SENIOR DESIGN PROJECT 1

Knock Detecting Deadbolt  Regular Deadbolt, with knock detection  Simply knock the secret code to unlock the door  Program your own knocking code  Same functionality as a standard deadbolt 2

How It Works  Battery Powered – 4 AA Batteries  ARM M0+ Microcontroller by freescale  Piezo Electric Sensor – Onboard Comparator  Dual Shaft Stepper Motor vs Solenoid  Program Button  Turn Lock Button  LED Indicators 3

Design Process  Project Proposal  Project Description  Hardware Design Review  System Software Design Review  Code Review  Final Demonstration & Documentation 4

Project Proposal  Preliminary written description of the proposed project  Directed to a review committee for funding  Preliminary Funding Assessment  Development Procedures  Estimated Development Time  Benefits of the project 5

Project Description  Functional Description  Standards such as IEEE  Development Plan  Electrical Specifications  Preliminary Parts List 6

Functional Description: Prioritized List of Features  Battery Powered (Extremely Low Powered State)  Wake Up with Knock  Unlock/Lock from Inside Button  Program Knock Button  LED Status Lights 7

Functional Description: Block Diagram 8

Functional Description: Detailed User Interface  LED’s  Green for Unlocking  Red for Locking  Blue for Programming Mode  Buttons & Knock  Function & Purpose 9

Functional Description: Software Description  Kernel – FreeRTOS v8.0  IDE – Code Warrior  Module Development – Tasks and Drivers  Algorithms & Functionality – User Leniency 10

Development Plan 11

Electrical Specifications: Power Requirements  Using Maximum Current  Estimated Battery Life 1 Hr  Using Conservative Typical Current  Estimated Battery Life 600+ Hrs 12

Preliminary Parts List 13

Hardware Design Review 14

Power Source & Power Supply Module  4 AA Battery Power Source  DC-DC Regulator  Buck-Boost 1.6V to 6V  High Efficiency 98% 15

User Interface Module  Program Button  Turn Lock Button  RGB LED  Lock Status Switch  Is the door locked? 16

Motor & Piezo Module  Motor Driver – L298N  Motor – Dual Shaft Stepper  Piezo – Zener Diode  N-Channel Mosfet  Decoupling Caps 17

System Software Design Review  MCU Requirements  Flash & Ram  Kernel Choice  FreeRTOS V8.0  Kernel Task Design  Tasks and Interrupts  CPU Load  Priority  Function 18

System Block Diagram 19

Code Review  Detailed presentation of code  Helps find bugs 20

Final Demonstration & Documentation  Present in front of classmates, professors, and potential employers  Engineering Change forms  Project Notebook  All other documentation from project creation 21

Prototype In Action 22