CAD Drawings

Testable Parameters

Describe how the construction of your prototype will allow you to verify the performance, durability, and usability. You should address the top design specifications from Element D. Optional: you can add parameters from the following list or add other additional parameters that are most important to the functions of your item

Most important parameters:

1. Efficiency

2. Weight/Size/Comfort

3. Cost

The prototype will allow us to verify the performance by the output of the TEGs which would inform us of the capability of having the potential to charge an iPhone. With durability, it would require us to test the prototype multiple times which would tell us if it can withstand the weight of the TEGs and other materials during the activities. Furthermore, the usability would heavily rely on the full potential of the TEGs, whether or not if there is a 20 degrees Celsius difference and the activities.

Build Expert List:

Drew Gatiss

Final Build Procedures Overview

1. 3D print the specified design of the armband frame in one piece

2. Insert the TEG modules into the slots assigned for them

3. Pull the wires from the TEG through the holes and place them down the assigned channels

4. Connect the TEG wires to the output wires/USB port and fir connections under the cover

5. Attach the top cover of the frame above the TEG modules to secure them into place

6. Insert velcro straps through the slots on the far ends of the armband frame and fit them securely in place with an even length on either side for ease of use

Construction Photos

insert photos of before during and after construction. This should include daily photos with descriptions of what happened during each build day.

Build Modifications

Our very first prototype frame was a very bare-bones operation with many of the additional components not yet added so there were several modifications to be made. First, we added small protrusions on the bottom of the sides of the hole for the TEGs so that they had something to rest on and wouldn't just fall through. Next, we created channels along the side of the frame for the wires to be placed along so that they wouldn't just be sticking out everywhere. We also added a cover over where the USB port was meant to be located so we wouldn't have any bare wires showing there either and so that the USB port would have something to hold it securely into place. Finally, we added a small knob between the two halves of the frame where the TEGs were split because we noticed that the frame as a whole was very rigid. However, after our next prototype, we noticed that there was no top cover to hold or protect the TEGs, the channels were too slim to fit all of the wires, there were still open wires around where the USB port was, and the frame was still mostly pretty rigid. To solve this, we first replaced the USB cover with a longer and more integrated cover that flowed better with the rest of the frame. We also extended the wire channels and created additional space for the other wires from the second TEG. We then printed a cover that would fit onto the top of the frame and cover the borders of the TEG to hold them into place but still allow for their surface to have contact with the outside temperatures. In order to solve the rigidity, we first tried to implement a flexible filament on the back end of the frame near the strap but it wasn't able to hold the proper structure/strength. Instead, we added more knobs and rotatable connectors between the parts so they would allow for freer movement which would allow the frame to fit better around the arm and sit more comfortably on the user.