Additionally, the preferred signal detection and logic includes {HEAD ~ an operational amplifier} connected to {TAIL ~ the output} of the light sensor and an analog to digital converter connected to the output of the operational amplifier 
Additionally , the preferred signal detection and logic includes { HEAD ~ an operational amplifier } connected to { TAIL ~ the output } of the light sensor and an analog to digital converter connected to the output of the operational amplifier
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH