Links

Processor

• Atmega 32U4 datasheet
• Atmel SAM3X/3A datasheet
• Atmega 32U4 AVR035: Efficient C Coding for AVR
• Arduino Due timer/counter overview
• Arduino Due timers

ELM327

• AT commands
• ELMduino project
• Connect ELM327 with HC05
• Datasheet
• OBD2 PIDs
• 3D print housing with power switch

FSC-BT836B

• Datasheet
• Programming user guide v3.3
• FSC-DB0004 user manual
• FSC-DB0004 schematic and assembly

HC-05

• Datasheet
• How to configure
• User Instruction manual
• Interfacing HC05 with Arduino

3.5 inch TFT display

• Product link
• UTFT library
• SdFat library

Design

INIT display

red = animation, yellow is order of appearance. CPU RAM and DISPLAY values appear after each other

• states for init display -> states for displaying each part separately, after everything is on screen, state for updating everything separate state machine? STATES:
• drop down title
• display each letter of initializing...
• display counter values and device info
• display bluetooth state
• update everything

transition to main display

• Wipe away contents on screen (black rectangle that spans the entire screen and increases in width)
• display "Welcome Sem"
  • Add new state for this
• show main display