Week 0 (Aug. 23, 2018): Beginning Spartan Superway

Hello, and welcome to my Spartan Superway blog! My name is Patrick Barrera, and I am a senior mechanical engineering student with a focus in mechatronics. Once I graduate, I hope to go into at least one of my areas of interest: electronics, programming, biotechnology, and machine learning. Some of my hobbies include staying in shape by working out and biking, doing DIY electronic and coding projects, and spending time with my family.

Working on the Spartan Superway project interests me because I would like to be a part of the future ... the future of transportation, the future of technology, and the future of society. I like working in interdisciplinary teams, especially with focuses in mechanical design as well as mechatronics, because I am able to learn things from outside my areas of knowledge. I would also like to expand my knowledge and skill set into areas that I do not know, such as welding and other machine tools, and to get hands-on experience with the concepts I learned from the theoretical classes, such as control systems.

I plan to contribute a considerable amount of my time and efforts to the Superway team. Also, I try to live by the mantra "Never Stop Learning," so I hope to learn and grow everyday while on this journey.

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Week 28 (Apr. 24, 2019): Final motor selection – Mini-Stepper Motor

Since last week, we have been trying to run the new brushless DC motor; however, it is still difficult to control, let alone its speed. Therefore, we had to pursue our alternative motor, the mini-stepper motor that runs at 5V. Found in Arduino starter kits, this mini-stepper motor is accompanied by its dedicated motor driver board, the ULN2003, which is a chip containing a series of Darlington pair transistors. An image of the stepper motor and the ULN2003 board is shown below: Sources: https://www.adafruit.com/product/858 https://www.amazon.com/gp/product/B01CP18J4A/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1 We were able to successfully run the new mini-stepper motor with the sample code included with the Arduino starter kit. One benefit to using the sample code is that it utilizes the Stepper library’s functions. One use function is the setSpeed( ) function, which allows the user to set the RPM speed of the stepper motor. We found that the ma...

Week 29 (May 1, 2019): CAD of Induction Charger Hub & Podcar Door, then 3D Printing

This week, while David worked on the Raspberry Pi and the Arduino code, Patrick completed the CAD (computer-aided-design) models. We had to create 3D solid modeling of two parts: the induction charging hub to hold the induction transmitter coil and the pod car door to hold the induction receiver coil. Over the weeks, the CAD models underwent several revisions. The induction hub saw two revisions, with the third design being the final version. Because the 3D printer available to us in the shop, the Prusa Mark3 i2, had a bed length of 10 inches, we had to restrict the length of the charging hub to a safe 9.5 inches. Version 1 simply entailed us placing the hub on the side of the bracket and then screwing it into place on the bracket’s side via the two holes at the top: For version 2, in addition to placing the hub on the side of the bracket and then screwing it into place on the bracket’s side via the two holes at the top, the bracket would wrap around the two bracket...

Week 25 (Apr. 3, 2019): Current Amplification Solved via Buck Converter

Today, we made the decision of going with the 12V, 600mA induction coil set, as they allowed for a greater distance between the transmitter and receiver, which was a maximum distance of 0.787 inches, as opposed to the 5V, 1500mA induction coil set, which had a maximum charge distance of 0.5 inches. As a reminder, we are implementing induction charging, also known as wireless charging, to charge the 3.7V Li-ion battery at designated charging stations within the track. This helps to enforce autonomy, which will further eliminate human intervention and manual maintenance of the system. Because the charge current is smaller, we tried to find a way to increase the charge current used to charge the battery. We settled upon using a buck converter, which decreases voltage with the advantage of increasing current. The buck converter would be placed after the induction receiver and before the battery charger. After some testing, we found that the buck converter could amplify the curren...

Patrick Barrera's Progress for Spartan Superway

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