COLORIMETER

Published:2009/6/22 22:52:00 Author:May | From:SeekIC

A hardware/software combination activates In turn，one of several LEDs enuts a portion of the visible spectrum .A phototransistor measures the light reflected by the surface being measured，andan 8-bit analog-to-digital converter（ADC） translates the phototransistor’s output into a digital format that the computer can interpret Seven LEDs （blue，aqua，green，yellow，orange，crimson，and red） provride a range of readings across the visible spectrum Lack of spectral continuity among adjacent LED colors could skew results，so the circuit provides built-in compensation for this error. Two simple BASIC programs control the circuit’s operation. One allows you to define a set of standards by measunng known Color samples and recording the values with an associated name The other program measures unknown samples and provides the best match with the defined standards，as well as a relative error factor.



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