1. Weekly Meeting 6 October 23rd, 2013

2.  PDR  Amherst bike shop visit  Cap self discharge test ◦ 2.6V to 1.8V (800mV) in 60 hours ◦ No longer a concern  Cornell Cup ◦ Wild Card Option ◦ Intel Atom processor October 22, 20132

3.  Arrived finally  2500 RPM = 12.8 V (open circuit) ◦ Lower than quoted  2500 RPM = 12.0 V (220 ohm load) ◦ Better than expected  Lower RPM and better diodes?  1.9A short circuit at 2500RPM October 22, 20133

4.  TA: Generator back EMF ◦ Force to turn shaft multiplies by gear ratio ◦ Motor power vs force optimization problem  Bike gear prototype may not be useful ◦ Only needed to determine optimal gear ratio  Can be achieved with RPM meter and drill  $14 on Amazon ◦ Better off building one configuration only October 22, 20134

5.  http://www.amazon.com/professional-tachometer-Non- contact-revolutions- Measurement/dp/B00DGLU1YK/ref=sr_1_2?ie=UTF8&qid=1382 482344&sr=8-2&keywords=rpm+meter http://www.amazon.com/professional-tachometer-Non- contact-revolutions- Measurement/dp/B00DGLU1YK/ref=sr_1_2?ie=UTF8&qid=1382 482344&sr=8-2&keywords=rpm+meter  2.5 RPM to 100KRPM range  No contact needed  Reflective strip on generator  Accurate to 0.05%  Can help determine ratio before moving forward October 22, 20135

6.  ECE webpage creation  Presentation in 2 weeks  Benchside meetings coming (4-5pm Thurs) ◦ describe individual MDR deliverables ◦ progress to date ◦ general project idea  Peer review summary  Discuss new prototyping ideas October 22, 20136