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Open Sesame

Open Sesame is a portable, compact door security accessory allowing remote unlocking via WiFi or Bluetooth proximity detection. Features Android/iOS app compatibility and simple installation. Explore future improvements and challenges faced in development.

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Open Sesame

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  1. Open Sesame

  2. Open Sesame Team • Grant Apodaca • Team Leader and Bluetooth • Richie Agpaoa • eCompass and power design • Evin Sellin • USB and embedded design integration • Eric Taba • Motor control and mechanical components • Jeff Bolin • Mobile app, WiFi and web server

  3. Description Open Sesame is a portable, affordable, compact and easy-to-use door security accessory, that can unlock your door remotely through WiFi with an android or iOS app, or it can unlock your door through a Bluetooth proximity detector that discriminates between authorized users. It requires a very simple, non-invasive installation, and it is powered from a 9v battery.

  4. Current Smart Lock Market

  5. Physical Device Design

  6. PCB Layout - Size • Our prototype is made larger than it needs to be to ensure success in our design. • In a consumer design, the processor, wifi, bluetooth, SD card modules could be made smaller with different package types, like BGA. • Analog power regulation could be done off the board to free up space • Packages could be placed on the bottom of the plane. • More than 4 planes could be used for routing.

  7. Top Level Block Diagram

  8. Bluetooth • Part used: RN42XV • Allows device to be activated in close quarters, regardless of internet connectivity • Device can be set such that it locks and unlocks automatically when bluetooth presence is detected • Supports secure simple pairing • Low power sleep mode

  9. Application • Main user interface • Includes controls, settings, and automatic status updates • Multi platform • Android, iOS, Windows Smartphone, etc… • Server communication • Used for authentication and broadcasting/ receiving updates

  10. Gear Assembly Specialized Bevel Gear • Designed with screw-holes for mounting plate and slots for crank • 5 to 1 Gear Ratio • Using Inventor 2015, force simulations proved required torque wouldn’t damage gears with iron material

  11. Motor Control • Motor driven by dual H Bridge chip • Bipolar hybrid stepper motor operates bolt, locking and unlocking door • Full-Step Motion: lower power consumption • Step Resolution: 1.8° - 200 steps • Quadrature encoder provides feedback on the position of the motor axle

  12. E-Compass • Part used: LSM303D • A digital 3-axis accelerometer and 3-axis magnetometer in a single package. • Used to determine if the door is open, closed, or ajar • Calibrated such that the magnetic field generated by the motor do not cause distorted measurements

  13. Power Distribution

  14. USB and Non-Volatile Memory • SD • Originally SD card was to be used for memory expansion • Eventually was exchanged for USB • USB Flash • Opens possibility for future integration of peripherals such as cameras, or other sensors.

  15. Challenges Faced • PCB Design Validation • Grounding plane issue • Respin process • Mechanical limitations • 3D printing flaws • Bluetooth proximity • Standardizing distance measurements using bluetoooth connectivity

  16. Future Improvements • Camera/Video integration • Ability to see who’s knocking at the door • GPS-based proximity detection • Battery monitor • Smaller size

  17. Sage Advice • Get started early! • Plan ahead, include redundant paths • Include as many test pins as possible • Pin out as many GPIOs as possible • Use debugging tools • Listen to Professor Johnson!!! • Seriously though

  18. Special Thanks • John Johnson • Wei Dai • Ilan Ben-Yaacov and Vincent Radzicki • NXP SemiConductors • SunStone Circuits • Rapid Prototypes • The ECE Shop • Department of Mechanical Engineering • Aubrey Shanahan

  19. Thank You! Questions? Comments? Concerns?

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