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Published byMarjory Flynn Modified over 9 years ago
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Robert Rebich Brandon Aldecoa Anas Hussain Sponsored by:
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New cars use keyless entry Bring bikes up with that trend Remove the need for keys, cards... etc. Biometrics are getting cheaper Fingerprints are the most reliable
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Implement fingerprint scanner to be used for ignition of a motorcycle Train multiple users Reliability Ability to withstand road conditions Security
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Design Budget: ~$2000 Keep total system cost under $150
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Stand alone scanner vs. embedded scanner Various types Optical Thermal Capacitive Electric field
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Thermal Scanner 3.3 V power input Scanner operative range (-40 to 85 ⁰ C) Module operating range (0 to 70 ⁰ C) Store 1900 Unique Finger Prints
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Currently working with ATmega48 AVR series very similar: code easily ported Flexibility with memory, I/O, cost Operating voltage range (2.7V – 5.5V)
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12V DC from battery3.3 V for scanner and AVR Possible options Zener diode voltage regulation Off the shelf regulator LM2937IMP-3.3CT-ND
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Interfaces between AVR and scanner DSP Toggling GPIO pins (on DSP) Serial communication USART0 Commands Send (AVR to DSP) Enroll Identify Delete Receive (DSP to AVR) Succeed Fail Suprema DSP Suprema DSP ATMEL AVR Enroll, Identify, Delete Success, Failure
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Use RF Engage relay Start the bike Ease installation Replace starter relay Wirless: no problem because cable too short Possible back up system Downside: Cost Linx modules cost $8 to $10 per receiver and $5 to $7 per transmitter
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Unique code with every unit inputs code using the keypad begin the enroll process User capable of programming own unique code User trained: system ready for use New user: repeat enrolling
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Early stage Decision about choice of AVR chip Number of I/O ports 11-13 I/O Size of final program Choose ATMEGA48 Placing Under seat Keypad over the rest of the electronics Possibly removable Packaged Survive harsh environmental conditions Easy to mount Hidden scanner Small size
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Length of the ribbon cable Currently Suprema only has a two inch cable Would like to extend length to about 1ft Suprema doesn’t have longer cable Longer cable not recommend Communication issues with extended length Heat tolerance of Suprema DSP chip Atmel AVR chips and scanner have industrial temp. ratings, Suprema DSP doesn’t
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QUESTIONS OR COMMENTS?
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