How does QTR-8RC Reflectance Sensor Array work?

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1

can someone please explain me how does the circuit of a capacitor connected in series with the IR receiver work??

i am trying to write a code in Cortex M-4 processor but i need to know how it works before i implement it.

thanks

2

The product page describes how to interface it with a digital I/O line: pololu.com/product/2459