| CPC G01V 8/20 (2013.01) | 22 Claims |

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1. A pest detection system comprising:
a printed circuit board (PCB) formed as an annulus;
a photo emitter disposed on a first portion of the PCB;
a photo detector disposed on a second portion of the PCB;
wherein the emitter is configured to emit infrared light toward the detector; and
a pulse-width modulation controller configured to drive the emitter and the detector.
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