Date post: | 22-Dec-2015 |
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Joel FeinsteinAustin Buchan
Ben MorseTeddy Martin
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Status UpdateStatus Update Actuation Sensitive Car Brake Light Microcontroller Boards with CAN peripherals acquired Wheel and Pedal simulator found Hall effect sensor and magnet specified Looking for ideal LED/reflector assembly Next Steps
◦ Acquire sensors and outputs◦ Research CAN/OBD-II protocols and vehicle idiosyncrasies◦ Flesh out feature list for adaptive learning/instructive behavior
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ArchitectureArchitecture Simple data producer
– data consumer model
LED-Side microntroller handles all state and data manipulation
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Use CasesUse Cases Regular Braking
◦ Mapping from brake-off to brake-full-on◦ Brake light will grow from center, increasing in
size and intensity◦ Adaptive learning to scale the brake light output
based on a users brake usage profile “Back Off” Mode
◦ A sequence of taps on the brake will flash the brake light for a few seconds alerting a driver behind you to increase following distance
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Risks & Mitigation
Risk MitigationHall effect sensor ineffective Use potentiometer
CAN communication not high enough bandwidth/too complicated to interface with
Replace CAN bus with 485 serial line between sensor and controller
Loss of connection between sensor and controller
Timeout fail-safe for brake light
Noisy sensor data Hardware and/or software filter