allow automatic control of lcd brightness and enable a number of advanced automotive driver comfort and safety features. Providing a simple two-pin connection, these photoelectric sensors can be used to adjust the brightness of lcds and reduce power consumption in consumer electronics by controlling keypad backlights. Enable automatic headlight control, tunnel sensors, and displays that adjust automatically to changes in ambient brightness. As phototransistors, these photoelectric controls promise to eliminate the need for an external amplifier. Miniature size and broad range of photoelectric controller are available in different operating modes. These industrial instruments are suitable for a wide variety of applications in the materials handling, packaging, semiconductor, pharmaceutical, document handling and assembly industries, verifying the position of materials or equipment in confined areas, directly on or inside conveyors and automated machinery.