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Using infrared reflective sensor TCRT5000 The detection distance: 1mm ~ 8mm apply focal distance of 2.5mm. The comparator output signal clean, good waveform, driving ability, more than 15mA. With a multi-turn precision potentiometer adjustable sensitivity adjustment. The working voltage of 3.3V-5V The output format: digital switching outputs (0 and 1) A fixed bolt holes for easy installation A small PCB board size: 3.2cm x 1.4cm Using a wide voltage LM393 comparator