The Arduino Nano and Ten CdS Photoresistors are combined to realize an Optical Flow Sensor.

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Nine diferential measurements are obtained from every consecutive pair of photoresistors (edge detectors).

Digital pins are used as outputs  to produce +5Volts and Ground, and as inputs to produce High impedance).

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All the signals are captured in the analog input A0.

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Based in the work of Geoffrey L. Barrows, Centeye, Inc. Simple optical flow sensor using 18 CdS cells.

http://embeddedeye.com/profiles/blogs/make-an-optical-flow-sensor-using-an-arduino-cds-cells-and-a-shoe

The getImage() function was modified to  capture data.

Search for “Optical Flow with Aduino NANO”  in   pastebin

 

The assembly procedure and test results can be seen in Youtube:

Aditional Tests made with the “Optic Flow Sensor”:

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