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  • Using a Digital Potentiometer to Optimize a Precision Single Supply Photo Detect
    Photodiodes bridge the gap between light and electronics. Many times precision applications such as CT scanners, blood analyzers, smoke detectors, position sensors, IR pyrometers and chromatographs utilize the basic transimpedance amplifier circuit that transforms light energy into a usable
  • Sensing Light with a Programmable Gain Amplifier
    of the PGA / Analog-to-Digital (A/D) conversion allows the photo sensor input signal to be sampled and quickly converted to the digital domain. Switching from channel-to-channel is then easier with the Serial Peripheral Interface (SPI TM) from the PICmicro microcontroller to the PGA.
  • Case Study - Light Butler: An Integrated Lighting System
    While working on a home lighting project, Alan Butler found a need for a lighting control device that combined a digital timer, motion detector, photo sensor and dimmer in one compact package. Searching the shelves of some large home centers in Alpharetta with no success, he discussed his lighting

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