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Analog technique for Digital sensor TCS3200

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Professor11

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Im working on a project of detecting Red color by using Digital sensor TCS3200
https://www.dfrobot.com/image/data/SEN0101/TCS3200 TCS3210.pdf

Here is the sensor's fuctional block diagram
**broken link removed**

The output is a square pulse, the change in number of pulses indicates the change in color
**broken link removed**

The problem is that my teacher require me finish this project USING ANALOG ONLY (no MCU). He suggested to convert the change of pulses into the change of voltage
**broken link removed**

I do not know what X is in this diagram. Could you show me some suggestions?
 

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