Junyang Zhou junyang5 ece120
Hongxuan Li hl13 ece120
Project Proposal
Introduction
Statement of Purpose
Owning a fantastic bike is a cool thing, but when someday you walk out your classroom and find out that the wheel or seat of your bike is missing, that is not cool at all. The construction design of modern bicycle caused it very easy to be disassembled and merely has lock could prevent all part of bicycles, especially front wheels and seats from being stolen. Now the Defender is a special bicycle lock which was designed to help people with such dilemma. With this lock we hope people could park their bike safely in any place with out considering whether the wheels or seat being stolen. We will design a series of lock for certain parts of the bike and using wireless bluetooth system to connect them together.
Background Research
As the function and construction of bicycle evolve through time, many new forms of bike like mountain bike and road bike have been invented, but meanwhile the safety assurance rate of bicycle locks people use today is still remaining in a very low state. Stolen like deconstruction front wheels and departing seats form bike is the most common way thieves would use. The most common types of lock using today is U-lock/D-lock, Chain lock, Folding lock and Cable lock, and from static research the U-lock has the highest safety rate, while Cable lock has the lowest; For the practicability, however, Cable lock is the highest and U-lock would be the lowest, and the folding lock would be the most convenient type to carry with. For constructing a combined lock system, the cooperation between U-lock as the master lock and several folding locks attached to the bike as the slave lock might be the best way to achieve better bicycle safety assurance.
Design Detail
Block diagram/ Flow chart
System Overview
This system consists of modules that communicate through a low energy wireless module. A master lock securing the bike frame to a locking pole will be able to open other locks and disarm the alert system when opened normally. The positioning module can be hidden inside bike handlebar and be activated if any abnormality is detected. The network can be a mesh network where each module will be able to communicate to each other, or a star network where the master lock controls all other modules.
Parts
- Arduino x2
- Wires and Resistor
- Transistor
- Logic gates
- Tact Buttons
- HC-05 Bluetooth Module x2
- Servo
- Key Switch
Possible Challenges
- Control of lock mechanism
- Wireless module to use
- Battery and charging of the system
- Network topology to use
- Way to pair the master lock with other modules - through the lock itself or a mobile app
- Unlocking method - fallback to key opening? Proximity sensing remote?
References
Weekly Overview
October 21th
Determined the design of our prototype and essential parts which would be needed.
October 28th
Redesigned the prototype and change modules to hc-05 and uploaded our order form.
November 4th
Start building the data connection between two bluetooth modules.
November 11th
Made the connection between the two Bluetooth modules but broke it afterwards. Built circuit for demo.
November 18th
Fixed Bluetooth connection, made a remote control LED system. Can switch LED on or off remotely via Bluetooth now.
December 2nd
Acquired Servo, piezo and hall effect sensor. Built circuit and wrote code to use piezo as a shock sensor. Looked up datasheet for hall effect sensor and wrote code to read the sensor.
December 5th
Began writing code to put them together. Encountered problem where the servo is spinning in one direction only. Might have shorted the servo somehow.
December 7th
Put everything together for demo. Bought another servo, but still didn't work. Turns out there is something wrong with MacBook Air's USB port. The servo works if Arduino board is powered by a Windows laptop somehow.
Attachments:
Untitled Diagram.png (image/png)
blockdiag.jpg (image/jpeg)
blockdiag.jpg (image/jpeg)
DEFENDER (1).pdf (application/pdf)
Posted by ndossa2 at Sep 26, 2016 15:41
