Bader Dashti Bill Dunlap Chris Hansen Mechanical Mechatronic Mechanical Ahmed Kamfar Alexander Kendrick Mechanical Mechanical Sponsor: One Media Player per Teacher Faculty Advisor: Professor Gregory Kallio
� 75 million children do not have access to primary school � 776 million adults lack basic literacy skills. � One Media Player per Teacher (OMPT) � Mini-projectors and digital audio devices
� Projector issues with battery recharging � Solar panels � Existing hand crank generators � Problems with existing models
To research, design, build and test a prototype of a multifunctional human powered generator that is more ergonomically efficient than currently available models.
Requirement Metric Method / Device Weigh no more than 14 lbs lb Scale Max size – 2’ wide x 1.5’ tall x 3’ long feet Measuring tape Fully charge a 3.7 V , 1700 mAh lithium-ion battery Voltage/ Multimeter in 2 hours Current Protect batteries from over voltage and over current Integrate small solar panel Indicator that battery is fully charged Be capable of connecting to different sized batteries Portable – easy to transport by single individual Have an onboard battery Easy to operate
Requirement Metric Method / Device Inexpensive – around $70 U.S. Dollars Total price of unit Protect from weather durability Stress tests • Water resistant seal Depth test • Dust resistant seal • Sun resistant UV resistance Material Analysis Primarily plastic construction
Requirement Metric Method / Device Durable – last at least 5 years durability Stress tests Onboard storage of battery that is being charged Readily Available Parts for Field Repair
Voltage 12V Current 125 mAh Max Power 1.5 W Dimensions 13.75 x 4.75 x .5“ Weight 1.6 lb
Rated Rotating Speed : 2800 rev/min Total Gear Ratio of 28:1 Outer gear at 1.66 rev/sec Rated Current : ≥1000mA Generates 3-phase AC output Rectified DC Output: ≥18.2V DC Lifetime: ≥3000h
Made of 2 2200mAh cylindrical 18650 cells with PCB and polyswitch for full protection Built-in IC chip will prevent battery pack from over charge and over discharge Capacity: 2200mAh Voltage: 7.4V Dimensions: 2.63 x 1.45 x 0.7 inch Weight: 3.5 oz Max. Charge Current: 1C (2.0A) Max. Discharge Current: 2.5C (5A) Cut off voltage: 6V Manufacturer's Part Number: 31003
� Frame-Addition of an aluminum frame � Case- Redesigned as a thin plastic case � Pedal-Plastic surface with aluminum struts � Flywheel- Custom aluminum casting � Driveshaft-Formed using a steel rod
Flywheel Drive Shaft
Analysis of drive shaft with 4x rated loading of generator. Even under extreme circumstances, the shaft experiences stress well below it’s yield point.
Case side with load � incident on drive shaft mount section. Load is 2 x the � maximum human loading on the device
Bridge Rectifier Circuit V + Dynamo Diodes: 1N4001 D D D V A Capacitors: 10 uF V B C Resistor 1: 82k Ohm V C Resistor 2 : 56k Ohm Voltage Regulator: 7805 D D D V - USB Port Circuit Regulator V + 5V Internal R1 R1 USB Vcc Port C C D1 R2 R2 D2 V - Gnd Data Lines at 2 V
Battery Voltage Reduction Circuit Adjustable Voltage Regulator V + 8.4 V V + Capacitors: 10 uF LM 317 240 Ohm C C LM 317 Regulator Formula: 1370 Ohm 1.25( 1 + 1370/240) Volts = 8.4 Volts V - V - Battery Charging Indicator Circuit V + V + LM 393: Voltage Comparator Battery Charging Source 1M Ohm 1k Ohm 8 V - LM 393A V - D2 3 + 1 2 - LED 2.2k Ohm 4 10k Ohm 1 Ohm 1N5819
V + Solar Panel V - Regulator V + LM 317 5V V + Dynamo R1 R1 D D D 240 Ohm USB V A Port C C V B C 1370 Ohm1 R2 R2 V C Data Lines at 2 V V - D D D Internal Vcc D1 D2 Gnd V + 1M Ohm LM393 1k Ohm 8 3 + 1 7.4 V Battery Diodes: 1N4001 2 - LED 2.2k Ohm Capacitors: 10 uF 4 V - 10k Ohm 1 Ohm Resistor 1: 82k Ohm 1N5819 Resistor 2 : 56k Ohm Voltage Regulator: 7805
� Multimeter attached to leads from projector battery. � Monitors voltage at ten minute intervals over the course of the charge cycle.
Part Projected Cost Table 9.3- Funding Sources Source Amount Fasteners (Screws, Nuts $33.20 One Media Player per Teacher $1,500.00 Bolts, Washers) Electrical Components $24.61 Associated Students Sustainability $3,500.00 Solar Panels Fund $16.08 Plastic Components $31.95 Total Funding for Project $5,000.00 Batteries $21.95 Mechanical Components $111.51 Misc. $65.97 Total Cost (per prototype) $305.27
Table 9.2 Hours Name Total Total Cost Per Person Hours Bill 112.5 $14,647.50 Chris 119.5 $13,472.43 Bader 105.5 $11,894.07 Ahmed 106.5 $12,006.81 Alex 111 $12,514.14 Total Cost $64,534.95
� Problems include � The weight requirement of the project. � Alignment of the dynamo to the flywheel � Material selection � Recommendations � Single frame � PCB � Larger onboard battery � Custom solar panel
� The current design prototype fulfills most of the requested specifications given by the sponsor, One Media Player per Teacher. � With this in mind, our sponsor can proceed with implementation of the generator in the field where it is most needed.
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