Prototype 2

In Prototype 2, we aimed to resolve the issues identified in prototype 1. To support the backboard of our RGM and eliminate the need for human support, we added books to the front of our RGM that the backboard was able to rest against and stay upright. Next, we utilized the stand for our tape to more prominently display our neopixel ring and 7-segment display. For our limit switch, we created a cardboard support that could be stuck into one of the stacked books so that it no longer needs to be held. Since the cloth was getting stuck on the ramp when it was pulled upright, we used a counterweight (a bolt) for the second pulley and attached the side of the cloth to the cup. To hide our electronics, our pico boards and wiring were placed on the back of the board. Finally, we decorated our RGM by adding a lined paper background to our board.

The image above is of our completed second prototype and illustrates the changes we implemented after the first prototype. The addition of books, both to support the backboard and to support the limit switch were viatal additions to make our machine autonomous. Additionally, adding paper, isolating the neopixel ring and seven segment display, and threading wires through the backboard cleaned up the overall appearance of our RGM.

This video highlights the most successful run from our second prototype. Notably, we ran into some challenges during this prototype and encountered many more failures than successes. 

In Prototype 2, the RGM was able to run completely but we encountered a bit more trouble with its consistency. More specifically:

• When we decorated and painted our RGM, it caused the backboard piece of where our book falling and ball lever release is mounted to warp. This caused friction between the book and the backboard and resulted in highly inconsistent falls from the book, often blocking the funnel and preventing the ball from reaching the second ramp. Therefore, we will need to create a solution to ensure this mechanism operates reliably.

• In our first pulley, the string kept coming off of the pulley wheel and caused disruptions to the start of our machine. We hypothosized that the excess string was causing it to get caught constantly on itself. Therefore, we endeavored to shorten the length of the pulley in hopes that it will resolve the issue.

• Additionally, since the blade on the limit switch is so skinny, the tape kept missing it entirely or wasn't able to deliver enough force to completely press the switch. We planned on adding something to widen/increase the surface area of the limit switch.