Created: May 15, 2014
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The Si1102EK uses a Silicon Laboratories Si1102 to measure infrared proximity. The Si1102 strobes an infrared LED at a frequency defined by the potentiometer labeled R2. The Si1102 measures the amount of infrared light that reflects onto the Si1102 package. If the reflected light magnitude exceeds a threshold set by the potentiometer labeled R1, the Si1102’s PRX output pin latches low, which turns on the blue LED labeled D2. The board is powered by a CR2032 battery, which can be connected and disconnected using the switch labeled S1. Header H1 provides access to the Si1102's pins.