COLIN KWOK ENGINEERING PORTFOLIO
Assignment 3
SP3 SolidProfessor
Mounting Bracket

Bracket

I3 Invention
A. Series of Questions for End User:
What is your problem?
Someone keeps borrowing my desk tools and not returning it.
What are your needs?
A sensor device that detects if someone is walking near my desks makes alerts.
How do you imagine it to work?
It would be a tripod mounted sensor that oscillates left and right to scan for a person.
How do you want the device to alert you?
Make a beep noise.
Why do you want this?
It’s based on a robot from the video game Team Fortress 2. I want it as a desk piece and I'd like to know when someone walks into my room.
What area do you want to scan for a person?
The entrance of a doorway, about at 90 degree area.
How far back do you want the sensor device to be from the door?
Doesn’t matter, but it should be able to scan the door regardless.
How big do you want it to be?
Maybe about the size of a water bottle.
How fast do you want the sensor mechanism to oscillate?
Maybe one back and forth oscillation every 2 seconds.
Observations:
The end user’s problem is that his desk tools go missing. He has suggested wanting a mechanical sensor device to detect if anyone is near his desk.
I was thinking of putting a sensor to alert when the users drawers are opened, but he suggested an oscillating sensor that monitors the door. A servo motor could rotate a platform that holds a sensor. Gear reduction could be used to put less stress on the motor. In addition, the user would like to have the model look like its video game counterpart.
B. Sketches of Ideas
Sensor on Shelf:
Trigger on Shelf:


Lock and Passcode:
Compact Oscillating Sensor:


Full Sized Oscillating Sensor:

C. Chosen Idea:
Out of the 5 sketched ideas, I've decided to go with the full sized oscillating sensor.
Engineering Characteristics:
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Tripod Base
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Sensor to Detect person
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Oscillating top portion
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Servo Motors
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LED and siren alerts
Units:
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1 foot tall
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8 inches wide
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10 inches long
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90 degree oscillation angle
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2 second oscillation period
Target specifications:
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Device will be plugged into a computer
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Device senses individual in the door, sends signal to computer
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Causes lights and sirens to go off
D. New Problem to Solve:
Create a tabletop sized mounted sensor that alerts when an individual walks through a door.
S3 Sketching
Isometric Objects




Cereal Box and Yogurt Container



