Kinetic Energy HarvestingWeekly Advisor Meeting

November 13, 2013

November 13, 2013 2

Basic LED visual indicator circuit designed◦ Red (>1.65V)◦ Yellow (>2.25V, >2.35V)◦ Green (>2.45V, >2.55V)

Cap overvoltage protection parts chosen 1.8V and 3.3V boost power supply designed

◦ Both operational when cap voltage > 1.2V All parts ordered, arriving Thurs Will be built this weekend Possible 5V supply for next semester

Electrical Progress

November 13, 2013 3

Steel hand crank fixture made Gear analysis

◦ Stress factors◦ Material strength◦ Intermediate ratios◦ Fewer gears, better efficiency

Gears are expensive◦ Current best option: Amazon (~$180)◦ 3D printing ($5/in^3)

Gears, shafts, pillow block mounted bearings to be ordered ASAP

Mechanical Progress

November 13, 2013 4

Wooden frame built for mounting gears onto

Approx 36”x20”x18” Not concerned with turnstile

shape yet Cross supports will be added

once gears have been chosen

Integration

November 13, 2013 5

Test system needed to determine efficiency Energy in:

Energy out: W= (CV^2)/2 Efficiency is the ratio between them

Efficiency Testing

Turnstile arms

Pulley

Hanging mass

November 13, 2013 6

Figure out what we need to test system Assemble circuits (Est. 3+ hours) Select gears Purchase gears Mount gears/shafts onto frame Measure efficiency Assignments...

To Do

November 13, 2013 7

Individual build summary paper (11/14) Two weeks exactly until final report (11/27) Thanksgiving break – no weekend meeting Final presentations begin (12/3) Final poster (12/4) Poster competition (12/5) Establish website presence Next Semester – switch to ECE requirements

◦ No more weekly papers

Assignment Schedule

November 13, 2013 8

Time to ship, build, and test before final report

Funds quickly decreasing Prof. Sup: choosing optimal motor speed Prof. Sup: design not complex enough No time to recover if parts don’t fit together

Concerns