no more before some sleep

diff --git a/arch.example.tex b/arch.example.tex
index b2ecc58..4627aab 100644 (file)
--- a/arch.example.tex
+++ b/arch.example.tex
@@ -89,8 +89,12 @@ where
 
 \subsection{Heartbeat \& Oxygen Saturation Sensor}
 As an example, the addition of a new sensor will be demonstrated. The heartbeat
-and oxygen saturation sensor is a \textsc{PCB} the size of a fingernail with a
-red \gls{LED} and a light sensor on it. Moreover, it contains an \textsc{I2C}
-chip to communicate. The company producing the chip provides the programmer
-with example code for \gls{Arduino} and \textsc{mbed}. So suppose %TODO
-Adding peripheral is supposedly simple.
+and oxygen saturation sensor add-on is a \textsc{PCB} the size of a fingernail
+with a red \gls{LED} and a light sensor on it. Moreover, it contains an
+\textsc{I2C} chip to communicate. The company producing the chip provides the
+programmer with example code for \gls{Arduino} and \textsc{mbed}. The sensor
+emits red light and measures the returning light intensity. The microcontroller
+hosting the device has to keep track of four seconds of samples to determine
+the heartbeat. In the \gls{mTask}-system, an abstraction is made. The current
+implementation runs on \textsc{mbed} supported devices. 
+%TODO Adding peripheral is supposedly simple.