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 simple air flow sensor using scrap parts.

Step 1: Components

simple air flow sensor using scrap parts.

1, mouse center wheel
2, heat shrink tube 
3, used ball pen refill
4, lm358 comparator circuit
5, acrylic sheet
6, IR slot sensor

Step 2: Circuit Diagram

Step 3: Sensor Assembling

Step 4: IR Slot Sensor MOC7811



MOC7811 is a slotted Opto isolator module,
with an IR transmitter & a photodiode mounted on it.
Performs Non-Contact Object Sensing. This is normally used as positional sensor switch (limit switch) or as Position Encoder sensors used to find position of the wheel.
It consists of IR LED and Photodiode mounted facing each other enclosed in plastic body.

Step 5: Demo

<p>Loved the awsm idea man. keep it up!</p>
<p>http://pdf.datasheetarchive.com/datasheetsmain/Databooks-5/Document249186.pdf</p>
<p>how can you identify which side is the sensor and which side is the transmitting diode on the slot sensor ? I have many of them of different sized, but no data sheet ? do u have any link ?</p>
<p><a href="http://pdf.datasheetarchive.com/datasheetsmain/Databooks-5/Document249186.pdf" rel="nofollow">http://pdf.datasheetarchive.com/datasheetsmain/Dat...</a><br></p>
I like the idea! You have my vote.
thank you <br>
What a great idea, good work. Voted.
thank you

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Bio: embedded system enthusiast ...
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