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\subsubsection{Microswitches}  Microswitches(see Figure \ref{fig:microswitch})  are used for a variety of purposes including contact/touch sensing. Microswitches are electric switches actuated by little physical force, which use a series of springs, levers and/or hinges to bring circuit components into contact\cite{FutureElectronics}. Once activated, these switches require a large movement in the opposite direction to reverse the electrical contact. This helps to smooth out the signals received from the switch. Microswitches can currently be found in door latches for microwaves, as well as in safety switches for elevators. They also have many other applications in diverse fields. As we wish to ensure both the presence of the tray and its correct positioning, microswitches are an appropriate sensing tool for this machine.