Add changes table.

dd.tex

@@ -83,6 +83,26 @@ amount of time and money.
 The Fenceless Grazing Collar system consists of a smart application,
 a "gateway", and individual collars to be placed onto animals.
 
+\section{Changes}
+
+The following changes have been made to this document as the term went on:
+
+\vspace{0.1in}
+
+\begin{tabular}{p{0.4\linewidth}p{0.45\linewidth}}
+    \hline
+    Before & After \\
+    \hline \\
+    Only LoRa was described in the design. & LoRaWAN explicitly mentioned and described. \\
+    \\
+    MariaDB was used for data storage. & SQLite used due to smaller footprint and easier setup. \\
+    \\
+    Gateway was responsible for LoRaWAN. & LoRaWAN offloaded to The Things Network. \\
+    \\
+    LoRa shield was used for Gateway. & LoRa concentrator does not come as a Raspberry Pi shield. A custom adapter
+    is used to connect the concentrator to the Gateway.
+\end{tabular}
+
 % Collars are attached to live animals that emit an auditory or electrical stimulus when the animal
 % leaves its designated area, preventing it from traveling further outside
 % the established grazing boundaries.
@@ -210,7 +230,7 @@ The LoRa gateway will consist of the following libraries, frameworks, and subsys
     \item \emph{Raspberry Pi:} The LoRa gateway's primary subcomponent will be
         the Raspberry Pi, a single-board Linux computer. The Raspberry Pi
         is capable of interfacing with hardware components such as the LoRaWAN
-        shield. It also supports the execution of arbitrary programs, such
+        concentrator. It also supports the execution of arbitrary programs, such
         as the API server and database management software.
     \item \emph{LoRa Interface:} The LoRa interface will be used as part of the
         LoRa gateway to allow communication between the gateway and the collars
@@ -244,7 +264,7 @@ livestock. Conceptually, it made up of the driver and the system logic.
         the interaction of the various components of the collar. As described
         in the structure viewpoint, the collar will be made of several
         physical devices, such as an AVR Atmega128 microcontroller, a
-        LoRa shield, and hardware for emitting sound. The driver
+        LoRa concentrator, and hardware for emitting sound. The driver        % TODO matt explain new setup
         component is the low-level software (likely written in AVR
         assembly) for interfacing with these components.
     \item \emph{System Logic:} Implemented using C, this code will
@@ -390,10 +410,8 @@ at a time, and the user will be able to switch between tabs at any time. The tab
 \end{itemize}
 
 \subsection{Structure View}
-The LoRa gateway will be constructed using a Raspberry Pi 2b and the corresponding LoRaWAN shield.
+The LoRa gateway will be constructed using a Raspberry Pi 2b and the corresponding LoRaWAN concentrator.
-The Raspberry Pi and the LoRaWAN shield have compatible pinouts, allowing one to be stacked on top
+A custom adapter will be created to connect the two.
-of the other without the using of soldering equipment or other, more invasive techniques.
-This construction also allows for the simple disassembly of the entire system.
 
 The Raspberry Pi component of the LoRa gateway will be connected to the internet using an
 Ethernet cable. It will also use a 32 Gigabyte SD card for the storage of the Linux (Raspbian)