Vishay’s VCNL4100 is an infra-red proximity sensor that works up to 1m, and includes an ambient light sensor. Inside, it combines an IR (940nm)emitter, photo detectors for proximity and ambient light, a signal-processing IC, and an 8bit/16bit ADC. For ambient light sensing, sensitivity 16bit and up to 0.011375 lux/step, allowing sensing though low-transmittance (dark) lenses as well ...
Read full article: IR proximity detector works up to 1m
from Electronics Weekly http://www.electronicsweekly.com/news/products/sensors-products/ir-proximity-detector-works-1m-2016-11/
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