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The machine for this project utilizes two types of photodiodes: one to sense the yellow light from the candlelights and one to sense the IR light from the IR LED (to check if the candlelight is present). Photodiode material composition will be selected according to functional operating demands, likely silicon for the yellow light and germanium for the IR light.   \begin{table}[h]  \centering  \caption{Summary Comparison of the 3 Types of Photoelectric Sensors}  \label{tab:Photosensors}  \begin{tabular}{|c|c|c|c|}