added tex comments

tex/chapters/sensors.tex

@@ -0,0 +1,14 @@
+\section{Sensors}
+
+	\subsection{Barometer}
+		As stated by \cite{ipin2015} \todo{and the other paper directly}, ambient pressure readings are highly influenced
+		by environmental conditions like the weather, time-of-day and others. Thus, relative pressure readings are
+		preferred over absolute ones. However, due to noisy sensors \todo{cite oder grafik? je nach platz}, one
+		single reading is not enough as a relative base. Harnessing the usual setup time of a navigation-system (
+		route calculation, user checking the route) we use the average of all barometer readings during this
+		timeframe as realtive base $\overline{\mPressure}$.
+		
+		
+	\subsection{Wi-Fi \& iBeacons}
+	
+	\subsection{Step- \& Turn-Detection}