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When the candlelight is turned on, the light, flickering or not, is detected by the photodiode and the PIC is programmed to recognize the increased light intensity.   Greater light intensity corresponds with a higher output voltage. The intensity of light detected by the photodiode is a function of the intensity of the emitter, but also the distance from the sensor. The candlelights are closer to the photodiode than the presence illumination LEDs beneath the tray.   The sensor array consists of a circuit board containing the circuitry for the 9 yellow photodiodes, the 9 respective transistors for power amplification and the Op-amp. o-amp.  The mux for the yellow light signals is mounted next to the yellow sensor board, and they receive the same voltage and ground. The PIC also has a ground reference linked to the ground of the sensor board. The sensor board is powered by 5V at 2A. The light detecting circuit can be seen in figure # (!!!!!!) \subsubsection{Servo Motors Driver Circuit}