Modifications

H-bridge -> Relay

Originally we chose to use a H-bridge within our circuit to allow us to be able to send 9v directly to our heating tape. With the preliminary H-bridge from class we were able to get it to work with an led instead of the heating tape. Unfortunately this H-bridge cannot handle the amperage from the heating tape, so we upgraded to a larger H-bridge. The new H-bridge was much more complicated and we had difficultly getting it to work. We then decided to switch to a relay because of its simplicity and smaller size.

Electronics in cap -> Electronics in bottom

When we stored our electronics in the cap, we had to 3D print a cap to fit onto the canister. With our custom cap, the seal wasn't ass tight, lessening the vacuum effect. In order to combat this, we decided to store the electronics in the bottom so we could use the original cap to create the vacuum seal to better insulate the canister.

4" Yeti -> 7.5" Yeti

In order to store the electronics in the bottom, we had to get a larger canister.

Arduino Uno -> Arduino Nano

We chose to use the Ardiuno Nano instead of the Arduino Uno because the Nano is significantly smaller than the Uno. For our project we wanted a small compact final product so that it can be portable, as a result we must use the smallest possible components. The Nano also uses less energy than the Uno which was a big factor in us choosing to switch.

New Inside Casing

In order to store the electronics in the bottom, we had to create new inside casing to hold the NARCAN and act as a separate between the electronics.

Breadboard -> Perf Board

We switched from a bread board to perf board so that we could customize the size of the bread board. With perf board, we could cut it down so we only used what we needed instead of taking up extra space.

Insulated Cap

When we switched from the Yeti Rambler, to the Yeti Low-ball the cap became insulate. It also is threaded instead of sealed with rubber, and doesn't have any electronics inside it.

Arduino Nano -> Arduino Micro

We switched to the Arduino Nano due to it's compact size. Sadly when testing the Nano with the temperature sensor the temperature readings were inconstant and sporadic. With the same exact circuit the Uno was successful. We concluded that the issue was the Nano. This led to us purchasing a Arduino Micro, another small Arduino. Using the Uno instead would have been perfect since it was working consistently but its to large for our product.