Color sensor using phototransistor... Help required
am doin a small project color sensor using PIC 16F877a. I used LDR but its not sensing the different colors that are reflected from 3 leds RED BLUE GREEN. So I changed to phototransistor. Now i need a circuit for the same. Because all my works are in vain. I am givin the circuit that i used with LDR.
img220.imageshack.us/img220/7573/colorsensorusingldr.jpg
HI... U CAN USE A IC FOR COLOR SENSING i.e Agilent HDJD-S722-QR999 Color Sensor that sense color and give u a particular voltage than use adc to convert analog to digital and then connect to microcontroller
if ic is costly then use three led for three different color for example u want to detect red color simply use red led at place of ldr
as red led pass more current on red light fall on it........use same theory for all
tnx 4 ur interest sunny....
the thing is i hav to use a phototransistor and PIC for compulsory...
plz help on that...
......may be phototransistor gives output at all frequency rather than single one so it may not be use for color sensing.......
wot bout photodiode or LDR....?
THEY BOTH ARE ALSO SAME WORK AS PHOTRANSISTOR..............READ AN ARTICLE ON Color Sensor from a Reversed LED and Op Amp - Robot Room .......U CAN USE REVERSE LED FOR COLOR DETECTION
MOD: Dont use all capital letters unless necessary
This may help you !