The Assignment

Design a simple system.

Expectations:

• Use at least two submodules
• Submodules can be
  • from a demo (eg lfsr)
  • from an assignment (eg debouncer)
• Simple submodules can be used but won’t count toward the requirement (eg clock divider or timer)

Deliverables

1. Single-page design description and specification
2. Project files in midterm/ subdirectory of your repo
3. Demonstration video uploaded to canvas

Note: do not put videos in your repository, the file size is too large.

Example: Digital Candles

Inspired by the “digital menorah” product.

Description: LEDs simulate flickering candles.

Each LED should have a distinct flicker pattern.

Initially, there should be no lit candles. A candle is “lit” by pressing a button. Each button-press increases the number of lit candles. A reset button turns off all the candles.

Submodules:

• lfsr to generate random flicker patterns
• debouncer for button
• counter for number of “lit” candles
• clock divider to slow flickering so it’s visible

Example: Chorded Button Input

Description: Use the four U/D/L/R buttons to enter numbers 1-10 and display the value on the LEDs. The button encoding is as follows:

Submodules:

• Debouncer (modified)
• Button-to-number decoder

Example: Combination Lock

Description: Use the four buttons U/D/L/R to implement a key code. Initially all the LEDs are off. If the correct six-button sequence is input within a six-second time window, then all the LEDs light up. The center button resets the lock.

Submodules:

• Debouncer
• Button shift register with six-second timeout
• Clock divider, timer and such