Category Archives: Engineering

[ENGR100] Rube Goldberg Machine

The task that was to be performed in this project was to construct a Rube Goldberg Machine that could catch and throw a Ping-Pong ball.

rube goldberg project

Figure 1: Schematic of Final Design Layout

The final design is a Rube Goldberg machine which has eleven energy transfers and seven sources of potential energy.  The device will be initiated by the dropping of a Ping Pong ball into a Styrofoam cup mounted to a cardboard tower.

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The ball then rolls down a ramp attached to the tower, hits a pendulum, and then rolls down the second ramp landing in the mouse trap launcher to be launched to the next group. The pendulum that was hit by ping pong ball swings and hits a marble which then rolls down a cardboard ramp.

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The marble hits a nut at the end of the ramp, which causes the nut and marble to fall and then land in a box on one end of the pulley.  This causes the weight to become uneven and the side with the weights in it start to fall towards the plywood base. The other end of the pulley is tied to the edge of a cardboard ramp which has another marble on it. As the string pulls on this side, the incline of the ramp increases and the marble rolls down, landing on the elevated end of a lever.

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The other end of the lever raises and then hits the ramp which has third marble on it. The third marble starts to roll down a ramp and hits some Popsicle sticks that are propping up a banana tied to a string.

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Upon hitting the sticks, the banana falls, thus agitating the string. A nut is balanced on the tip of a dowel that the banana is tied to.  When the banana falls, the dowel will jerk, which will cause the nut to become unsettled and then slide down the dowel, hitting the trigger of the mousetrap.  This will cause the Ping Pong ball to be flung to the next group’s machine.

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Figure 2: Photo of Completed Machine


Design Challenge 2 – Prepper Market

The second design competition happened near Homecoming Weekend. Our challenge is building product for preppers. We had about a week to come up with an idea and build prototype for it, then have a pitch in front of Bucknell Engineering Alumni Association to present our product.
So, my ideas is a light (LED) powered by water. It is the combination of a joule thief and galvanic cell.
I spent the whole week for this project. During my time working, I meet and make friend with many awesome professors such as Prof Siegel and Prof Kennedy. They complimented my ideas. On that week, I literally meet Matt Lamparter- head of Electrical Engineer Labs every day for materials.
I encountered a lot of problems while working on the project. My first problem is that the joule thief didn’t work, which takes me a lot of time to troubleshoot it. Second, when I plugged it in water, the LED didn’t light up because water only generate 0.8V while the circuit need 1.5V. I realized that water baterries should be connected in series but it was too late. So in my presentation, I plugged it in orange juice instead.
Our team got second place in the second design competition.

[ENGR100] Sense Compute Control Project

1. Purpose
Our overall goal was to create a logic circuit that turns on the air conditioning in a car if 3 specific input conditions are true: the driver is sitting, the weather is hot, and the door is closed.
Also, we wanted the car’s lights to turn on or off depending whether the area around the car was dark or light.


2. Sensors used:
Pressure Sensor: This sensor was used to determine if someone was sitting in the driver’s seat of the car.
Temperature Sensor (Thermistor): This sensor was used to determine if the air inside the car was hot.
Angle Sensor (Potentiometer): This sensor was used to determine whether the driver’s side door was open or closed.

3. How sensor signals were combined to compute desired result:
The air conditioning in the car would turn on if and only if someone was sitting in the driver’s seat, the air inside the car was hot, and the driver’s side door was closed. The car’s lights would turn on if and only if the driver’s side door was closed and the area around the car was dark.


Design Challenge – Trebuchet

This design challenge happened on the Friday before Family Weekend. Our challenge was to build a human powered trebuchet to throw a glow-in-the dark golf ball as far as possible. Before the challenge, I did come up with a design. After presenting it to my team, our team decided that we were going to implement my idea.

However, we encountered many problems during implementation process. We kept changing ideas. We had trouble connecting pieces of our trebuchet together. Two hours passed without anything done.
After we found the nail gun, the situation changed. We work very effective in the last one hour and we managed to finish our trebuchet on time.
We launched our trebuchet, but it did not worked so well. Nonetheless, we had good time that night finish our first trebuchet ever.