Design Skills Project (Variable Light Intensity)

Functional Specifications

• LED light that is button-activated to switch between the following operating modes:
  1. Off
  2. Brightest
  3. Intermediate Brightness
  4. Least Bright
  5. Flashing @ 2 Hz
• Self-contained device with LED and button exposed.
• Extra credit possibilities:
  • Battery life indicator
  • Waterproof enclosure
  • You tell us!

Constraints

• Run on single battery up to 9 V
• Electronics connected to a single PCB (can be single- or double-sided)
• Cannot weight more than 1 lb
• Cannot have a single dimension > 6 in
• Cannot cost more than $50 to duplicate unit
• Battery must be easily replaceable

Evaluation

• Minimize weight

• Minimize size

• Maximize Brightest mode

• Minimize power draw / maximize battery life

• Survive 3 foot drop with battery installed

• Create-and-maintain a GitHub project repository to maintain version history of:

  • Mechanical CAD (PDFs + more)
  • Electronic CAD (PDFs + more)
  • Software
  • Testing data
  • Design history / notes
  • Specification sheets
  • Usage notes (README.md)
  • Kanban board / Issues / Milestones