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Closed loop chromaticity control: interfacing a digital RGB color sensor to a PIC24 MCU

Posted: 09 Sep 2009 ?? ?Print Version ?Bookmark and Share

Keywords:RGB color sensor? digital color sensor? PIC24 MCU?

This application note describes interfacing the TAOS TCS3414CS digital color sensor with a PIC24F to establish a closed loop control system for maintaining a consistent chromaticity output for an RGB LED backlight unit (BLU) illumination system for a graphics LCD panel. A chromaticity control system for LED illumination requires five main hardware components: a control processor, a constant current LED driver, RGB LEDs, a color mixing mechanism and a color sensor. Control system firmware and system calibration complete the application to achieve stable chromaticity output control.

The Explorer 16 Development Board, (DM240001) and a custom PICtail PCB design create a convenient development environment to explain the requirements for a closed loop control system, achieving a specific Correlated Color Temperature, (CCT). This closed loop color control backlight application can also be applied to general illumination systems.

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