Download - PRESENTATION #3
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PRESENTATION #3Electric Bike Charging and Docking Station: ECE Group 7
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Presentation Introduction
● Project Introduction
● Locking System Overview & Testing Results
● Charging System Overview & Testing Results
● Control System Overview & Testing Results
● Prototype Demonstration
● Budget Review
● Conclusions
● Questions
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Project IntroductionJustin Hatcher
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Project Sponsor
● Bicycle Capital
● Background Information
○ Developing an electric bike sharing
program for the local area and beyond
○ Focused on providing a reliable,
efficient method of transportation
○ Currently have eBike sharing programs
in South America
Justin Hatcher
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Problem Statement
● To create a docking station capable of automatically charging and locking the
eBike being utilized by Bicycle Capital
● Major Challenges:
○ How to charge the eBike?
○ How to secure the eBike?
○ How to minimize user interaction with the station?
Justin Hatcher
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Needs Analysis
● The eBike charging and docking station should:
○ Be able to efficiently charge an eBike
○ Be able to securely lock an eBike
○ Utilize a front facing docking method
○ Require minimal user interaction
○ Be able to operate in adverse weather conditions
○ Be modular by design and aesthetically pleasing
○ Be cost-effective
Justin Hatcher
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Areas of Focus
● Locking System
○ The locking system encompasses how the eBike will be kept secure
○ Includes the station and bracket design
● Charging System
○ The charging system encompasses how the eBike will be charged
○ Includes all electrical components required to charge the eBike
● Control System
○ The control system encompasses how a user will check out an eBike
○ Includes the RFID module that will control the locking system
Justin Hatcher
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Locking System Overview Elijah Goodson
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Final Station Design
● Height: 37 9/16 inches
● Width: 12 1/8 inches
● Depth: 21 inches
● Weight: 50 pounds
Eli Goodson
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Final Station Design
Eli Goodson
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Final Station Design
Eli Goodson
Parts List from Top to Bottom:
● Insulation Cover
● Female Charger Connection
● Charging Support
● Latch Support
● Base Plate
● Latch Solenoid
● Wheel Well
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Final Station Design Overview
● Initial designs were focused around a linear actuator based design
● Final design uses a latch type solenoid as the locking mechanism
● Why the latch solenoid was chosen:
○ has a fail-safe locked position if no power is supplied
○ less expensive than linear actuators
○ quicker reaction time than linear actuators
○ smaller in size than linear actuators
● The final station design is more simple and more efficient with only eight parts
Eli Goodson
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Final Bracket
● Height: 3 inches
● Width: 2 21/32 inches
● Depth: 6 1/8 inches
● Weight: 3.22 pounds
Eli Goodson
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Parts listed from top to bottom:
● Insulation Cover
● Male Charger Connection
● Charger Support
● eBike Bracket Attachment
Final Bracket
Eli Goodson
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Final Bracket Alterations
● Removed a stability peg to create room
for the electrical components
● Added additional space to run electrical
wires to the lithium-ion battery
● Increased the overhead clearance for the
electrical components
Eli Goodson
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Final Bracket Overview
● Bracket has been fabricated from a donated piece of billet aluminum
● Design keeps electrical components hidden from elements
● Design has a more streamlined shape that is aesthetically pleasing
● Electrical components are housed in 3-D printed plastic to keep them insulated
and protected from tampering and weather
Eli Goodson
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Final Station Design with eBike Attachment
Eli Goodson
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Locking System Testing ResultsHunter Harrison
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Station Base Testing
Simulation Testing
● Simulation testing was performed on the station base using Solidworks 2014
● Strength tests and deformation tests were simulated
● Base material used in the simulation testing: AISI 321 Annealed Stainless Steel
Hunter Harrison
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Types of Testing Overview
● Strength testing:
○ Applying a load to the component while grounding a specified surface and
seeing how much stress occurs and where the stress occurs
● Deformation testing:
○ Applying a load to the component and seeing how the component will
deform and where the component will deform
Hunter Harrison
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Station Base Strength Test Results
● The testing force applied: 2000N (450 lbf)
● The force was applied to the top of the station
● The station was grounded at the base
● Blue coloring indicates low values of stress
● Red coloring indicates higher values of stress
● The station base is sufficiently strong
Hunter Harrison
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Station Base Deformation Test Results
● The testing force applied: 2000N (450 lbf)
● The force was applied to the top of the station
● The station was grounded at the base
● Blue coloring indicates low values of stress
● Red coloring indicates higher values of stress
● The station base is sufficiently strong
Hunter Harrison
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Bracket Strength Test
● The testing force applied: 2000N (450 lbf)
● The force was applied to the top of the bracket
● The station was grounded at the base
● Blue coloring indicates low values of stress
● Red coloring indicates high values of stress
● Stress is higher around bolt holes as expected
● The bracket is sufficiently strong
Hunter Harrison
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Future Testing
● Full scale prototype made of AISI 321 Annealed Stainless Steel tubing should be
subjected to tests such as the ones simulated to validate simulation results
● These tests have not been performed due to the fact that our prototype
station base was created using wood to reduce cost
● The strength of the latching solenoid should also be tested to ensure it can
withstand the proper amounts of stress expected
Hunter Harrison
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Charging System OverviewGabriel Sejas
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Final Charging System Connection Device
● Final Connection Device:
EZGO Charger Plug
● The EZGO charger is commonly used to
charge golf carts
● This connector was selected because it
can handle the voltage and current
output needed
● The device has internal components that
are easy to connect and disconnect
Gabriel Sejas
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Female Charging Connection
Parts List from Top to Bottom:
● Insulation Cover
● Female Charger Connection
● Charging Support
● Latch Support
● Base Plate
● Latch Solenoid
● Wheel Well
Gabriel Sejas
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Key Charging System Components:
● Insulation Cover (red piece)
● Male Charger Connection
● Charger Support (yellow peice)
Male Charging Connection
Gabriel Sejas
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Charging System Testing ResultsXiaoRui Liu
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Charging System Testing
● Testing Goal: To ensure the lithium-ion battery charges at the same rate with
the created Charging System as it does with the standard charger
● Specific Tests:
● Voltage Output Test
● Charge Time Test
XiaoRui Liu
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Voltage Output Test
● Test Purpose: To ensure the output voltage coming from the created Charging
System is the same output voltage from the standard charger
● Test Results: Under the same testing conditions the output voltage of the
Charging System was equal to the output voltage of the standard lithium-ion
battery charger
Tested System Charging System Standard Charger
Expected Voltage 42.5 V 42.5 V
Measured Voltage 42.5 V 42.5 V
XiaoRui Liu
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Charge Time Test
● Test Purpose: To ensure the total charging time when using the Charging
System is the same as the total charging time when using the standard lithium-
ion battery charger
● Test Procedure: Under the same testing conditions, test the time it takes to
fully charge the lithium-ion battery with the Charging System and with the
standard lithium-ion battery charger; compare the results
● A full charge time test has not yet been completed
XiaoRui Liu
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Charging System Testing Conclusions
● The voltage output test was successful as previously shown
● When the eBike was connected to the station, the standard lithium-ion battery
charger recognized the eBike’s lithium-ion battery
● This confirmed that a solid safe connection was made between the charger and
the lithium-ion battery
● The limit to charge time will be how fast the standard charger charges the
eBike’s lithium-ion battery
XiaoRui Liu
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Control System Review Hassan Aftab
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Control System Components
● 12 Volt DC latching solenoid
● Solenoid driver circuit
● Arduino Uno microcontroller
● Arduino Protoshield
● RC522 Mifare RFID reader/writer
● RFID swipe cards and access fobs
Hassan Aftab
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Control Components Flow Chart
Microcontroller Solenoid Driver DC Latching Solenoid
RFID Sensor12 V DC Supply
Hassan Aftab
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Solenoid Driver Schematic
Hassan Aftab
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Microcontroller Pins Table
Hassan Aftab
Arduino Uno Input/Output Pins Function
Digital I/O 5 RFID RST - Reset control
Digital I/O 8 Output signal to solenoid driver
Digital I/O 10 RFID SDA - I2C-bus serial data line input/output
Digital I/O 11 RFID MOSI - SPI master out, slave in
Digital I/O 12 RFID MISO - SPI master in, slave out
Digital I/O 13 RFID SCK- SPI serial clock input
3.3 V RFID 3.3 V Input
GND RFID GND
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Input/Output Pins Schematic
Hassan Aftab
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Control System Test ResultsHassan Aftab
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Microcontroller Testing
● Testing was done to ensure the Arduino Uno was full functionality
○ Board powered on when connected to power source (USB or DC source)
○ Ran various sample code sets and validated the results
○ Checked all input and output ports to ensure full functionality
○ Reset button functioned when pressed; system was reset
Hassan Aftab
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RFID Module and Reader Testing
● RFID module was placed on the top right corner of the prototype station
● The RFID module is sensitive to the amount of distance in which it will read a
RFID card or fob (the closer the better)
● We found that when the card or fob is almost touching the RFID module is
when the system performs the best
● RFID module clearly detects which RFID card or fob is being used
● RFID cards and fobs are passive which can sometimes cause a delay in solenoid
retraction time; we believe switching to active tags in the future will fix this
Hassan Aftab
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Solenoid Testing
● Connected DC latching solenoid to a 12V 2A DC
power supply
● The solenoid latch retracted and remained
retracted as long as power was being supplied
● The test was successful:
○ The solenoid retracted quickly
○ Default position was in the locked position
Hassan Aftab
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Solenoid Driver Testing
● Constructed solenoid driver circuit and ran a basic blink program on the Arduino
Uno using an output pin to drive the solenoid
● The program provided a signal to the latching solenoid whenever LED1 on the
Arduino Uno microcontroller blinked
● Test successful; solenoid latch would retract whenever LED1 blinked and would
remain retracted in correspondence to the LED1 blinking frequency
● For example, if the LED1 blinking delay was set for 5 seconds, the latch would
remain compressed for 5 seconds before releasing
Hassan Aftab
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Full Control System Testing
● When an RFID card or fob is swiped,
the solenoid will actuate allowing a
user to remove the eBike from the
station
● The station will only unlock for the RFID
cards or fobs that have been specified
in the code supplied to the
microcontroller
● The control system is fully functional
Hassan Aftab
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Prototype DemonstrationJustin Hatcher
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Project BudgetGabriel Sejas
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Items Purchased
Gabriel Sejas
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Project Budget Breakdown
Gabriel Sejas
● Control System: $221.73
● Charging System: $136.43
● Locking System: $89.10
● Total Spent: $447.26
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ConclusionJustin Hatcher
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Project Conclusion
● A fully functional charging and docking station was designed and prototyped
● All major goals of the project were achieved:
○ The station securely locks the eBike
○ The station efficiently charges the eBike
○ The station requires minimal user interaction
● The station provides a solid base in which more sophisticated station can be
built upon in the future
Justin Hatcher
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Path Forward
● Weatherproofing of the station
● Aesthetically pleasing shell/cover
● Updated RFID module with active cards and fobs
● Cloud based user and eBike identification system
● Solar panel canopy
Justin Hatcher
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Questions?