Picture of low cost air flow sensor
 simple air flow sensor using scrap parts.
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Step 1: Components

Picture of 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

Picture of circuit diagram

Step 3: Sensor assembling

Step 4: IR slot sensor MOC7811

Picture of 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

Picture of demo

Loved the awsm idea man. keep it up!

Jestin_Cubetech (author) 1 year ago



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 ?

Jestin_Cubetech (author)  goldenshuttle1 year ago
janw1 year ago
I like the idea! You have my vote.
Jestin_Cubetech (author)  janw1 year ago
thank you
What a great idea, good work. Voted.
Jestin_Cubetech (author)  john pedersen1 year ago
thank you