For example, the original idea was that a gear would turn the actuator disk of the iris, and so the actuator disk with teeth on the side, as well as a matching custom gear, would be 3D printed, but the 3D printers we had at our disposal were not capable of printing these details. Another problem we encountered with automating the GAC was that the physical structure of the GAC would not allow for the components to be integrated in the way that we had envisioned. When building our circuit, our Arduino became overloaded with too many components, and so was unable to work. The initial goal was to integrate electronic components to the GAC, such that when the user places their cup inside, the iris automatically closes to the right diameter and then opens again when the user wants to remove the cup from the GAC. Unfortunately, we were not able to automate the GAC. When the car accelerated or decelerated, there is a noticeable spike in g forces in our data for the center console, but that is spike is very reduced or nonexistent in the g forces recorded inside the GAC. Not all of the data was clean and easy to interpret, although the data that we were able to organize did show that the gyroscope design does indeed isolate the GAC from changes in acceleration caused by the car in every direction except for the z-direction (perpendicular to the road), although it should be noted that the GAC was not intended to isolate movement in that direction, only the x and y directions. We did an acceleration test, a brake test, and a swerving test, each done at various speeds while recording data from the accelerometers. We also tested the GAC in a vehicle by using apps that record accelerometer data from iPhones that are placed inside the GAC and on top of the center console and then driving a predetermined course to mimic driving behaviors that could cause a container in the car’s stock cup holders to fall out or spill. The GAC is capable of securely holding any cup measuring within 2.5 in and 4 in in diameter thanks to the iris (in fact, the iris can close around a diameter of approximately 1 in, although there aren’t any commonly used containers of that that would be used in a cup holder). We tested the GAC, more specifically the iris, with various different sized containers, the largest of which was an RTIC/YETI type 32 oz tumbler cup, measuring about 4 in in diameter at the widest part, while the smallest tested was a Red Bull style aluminum can about 2.5 in in diameter. These slits have rungs, on which a bar that holds up the base of the cup can rest the pattern of the rungs are mirrored on the other side, so that the user than easily adjust the height of the container placed in the GAC. The bottom of the iris connects to another cup that has slits on the sides all the way through. This diaphragm is meant to close around the container that is placed in the GAC in order to prevent it from tumbling and bouncing around a cup holder that is bigger than bottle being used. A three ring gyroscope is fused to a section of a cup that connects to the top of an iris diaphragm. Our final GAC design can be described as follows.
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