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Sabin Maharjan edited this page Oct 12, 2015 · 21 revisions

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Current Homework: 2 - Initial Proposal

Product Name "TBD": A Digital Level

The project we have decided to move forward with is a digital level using an accelerometer. The microcontroller will be an Atmel ATmega328. Depending on the inclination of the level when it is placed on a surface, indicator LEDs will be lit up in imitation of the bubble on an analog level. There will be a power switch on the side to turn it on and off, and it will be powered with lithium ion batteries.

Requirement checklist:

  • 1 Sensor? Accelerometer
  • 1 Actuator? Multiple LEDs
  • Digital or Analog Processor? ATmega328
  • Safe? Yes
  • Schematic in progress using EagleCAD
  • PCB will be correctly sized
    • May have second PCB for LED assembly
  • PCB designed from scratch
  • >= 25% surface mount components: 100% will be surface mount
    • Components will all be larger than 0603
  • Will be built by our hands
  • Enclosure will be 3D printed
We used a decision matrix with the relevant categories constituting a "good" project. The project with the highest score was chosen. The Decision Matrix we used follows.
Miguel's Scores
. Ease Cost Interest Usefulness Style Totals
Laser Trip Wire System 1 3 2 5 3 14
Pulse (Heart) Monitor 5 4 4 5 4 22
Fingerprint Door Lock 4 3 4 4 4 19
Digital Level 4 4 2 4 2 16
Sabin's Scores
. Ease Cost Interest Usefulness Style Totals
Laser Trip Wire System 3 5 2 3 2 15
Pulse (Heart) Monitor 4 4 2.5 4 3 17.5
Fingerprint Door Lock 3 4 3 4 4 18
Digital Level 4 4 3.5 3 3 17.5
Christina's Scores
. Ease Cost Interest Usefulness Style Totals
Laser Trip Wire System 2 1 3 2 3 11
Pulse (Heart) Monitor 3 3 3 4 4 17
Fingerprint Door Lock 3 3 3 4 3 16
Digital Level 3 4 4 4 3 18
Cal's Scores
. Ease Cost Interest Usefulness Style Totals
Laser Trip Wire System 3 4 3 3 2 15
Pulse (Heart) Monitor 4 3 2 3 2 14
Fingerprint Door Lock 2 2 4 4 4 16
Digital Level 3.5 3 5 5 3 19.5
Overall Scores
Laser Trip Wire System 55
Pulse (Heart) Monitor 70.5
Fingerprint Door Lock 69
Digital Level 71

Alternate Idea Paragraphs

Laser Tripwire

Your text here

Pulse Monitor

Pulse sensor will use infrared emitter and detector to detect a pulse from a finger tip. The pulse sensor uses infrared light reflected by the blood from the fingertip. It turns the mechanical pulse action into electrical signal.

Couple of ways to display the data:

  • Cascade of seven segment display.
  • Graphic wave monitor
source: http://makezine.com/projects/ir-pulse-sensor/

Fingerprint Door Lock

Your text here

Previous Homework Assignments

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