Wireless Energy Contest helps K-12 Engineering Outreach Program
The ECE-led K-12 Engineering Outreach program racked up the engagement awards at Ohio State University this year, but several undergraduate students were curious: How could they help make it even better?
Electronics Club members at Ohio State partnered up with Eta Kappa Nu (HKN) to host an engineering contest for undergraduate students. The challenge: Build and design the most efficient wireless energy transfer circuit project, using less than $15 in supplies.
In the end, Electronics Club member Jeff Hensal was declared the winner. Coming in second place were students Chad Holl, Collin Stipe and Tyler Nelson. Student John Nijim won Honorable Mention.
A bit of background: This past year the K-12 Engineering Outreach volunteers created a new wireless energy transfer project, adding to its roster of basic tech gadgets children and teens can build and become inspired by in the classroom. Watch a video of one student successfully completing her project.
Hensal describes the thought process behind his winning design.
“I made the same basic circuit as the outreach project, but with two important modifications,” Hensal explained. “First, I made the two inducting coils by winding magnetic copper wire around a cylinder that had an inverted piece of electrical tape around its surface. When finished winding, I folded the tape over itself and trimmed off the excess. This introduced stability in the coils and made sure they did not come apart.”
“The outreach project had two different shape/size inducting coils, which I believe had an impact on the transmission distance due to resonance. My inductors had the same inductance, which helped them resonate together better and therefore transmit further. The stability factor of the method I used to wind them made sure they would essentially stay the same,” he said.
Hensal’s project also only cost $1.85 to make, using one 1.5V battery, one 2N3904 Transistor, one 1k resistor, one battery holder, about 0.4 meters of very thin copper wire and 0.1 meters of electrical tape.
“I knew this design could be used in future ECE outreach events. It even improved the transmission distance,” Hensal said. “Since I made the various connections of the circuit by simply twisting the wires together by hand, I knew the design could be easily duplicable and children appropriate. It was easy to put together and can be done in less than 45 minutes.”
Contest entries were judged by a panel of ECE faculty, including outreach program director Betty Lise Anderson, professor Steven Bibyk and researchers from Nikola Labs.
For contest details visit: http://go.osu.edu/wirelessenergycontest