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Doodle Drive

Doodle Drive

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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