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Doodle Drive

Doodle Drive. Presenter: Peachanok Lertkajornkitti. Team 6. Reliability and Safety Analysis. Project Overview. Android application as controller Robot vehicle with microcontroller Path will be drawn in Android application and the vehicle will follow that path

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Doodle Drive

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  1. Doodle Drive Presenter: Peachanok Lertkajornkitti Team 6 Reliability and Safety Analysis

  2. Project Overview • Android application as controller • Robot vehicle with microcontroller • Path will be drawn in Android application and the vehicle will follow that path • Outdoor mode with GPS, Google Maps, Compass • Indoor mode with tilt control

  3. Criticality levels • Low: • Minor failures that doesn’t cause any physical damage to user • Doesn’t cause any damage to the PCB • E.g. Reading errors • Medium: • Cause physical damage to the PCB or the vehicle • E.g. Damage of the components due to overheating, inability to control the vehicle • High: • Cause injury to user/people around • E.g. Burn due to touching the components that overheats

  4. Components for analysis • Microcontroller (LPC1768) • Complex • 100 pins , 32-bit • Tj = 50 ºC • λ = 2.904 e -6 • MTTF: 40 years

  5. Components for analysis • Voltage Regulators (LM2596) • High temperature (but with good heat sink) • Tj = 25 ºC • λ = 1.44e -7 • MTTF: 792 years

  6. Components for analysis • H-Bridge • High voltage and current • High junction temperature • Tj = 75 ºC • λ = 6.6e-7 • MTTF: 171 years

  7. Components for analysis • Compass • MEMS (Micro-Electro-Mechanical Systems) –less reliable than ICs • Tj = 25 ºC • λ = 5e-7 • MTTF: 228 years

  8. Block Diagram PWM

  9. FMECA • Microcontroller

  10. FMECA • Compass

  11. FMECA • H-Bridge

  12. FMECA • Voltage Regulators (3.3V and 5V)

  13. THANK YOU! Questions / Discussions

  14. MicroController 1: Compass (I2C) 2: Bluetooth (UART) 3: GPS (UART) 4: H-Bridge (PWM, GPIO) 5: Ultrasonic (GPIO) 6: Optical Encoders (Input Capture, GPIO) 7: Crystal Oscillator 8: Fuel Gauge (GPIO) 9: Servo (PWM) 5 6 4 9 3 8 7 1 2

  15. H-BridgE

  16. COMPASS

  17. VOLTAGE REGULATORS

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