Introduction: Low Cost Air Flow Sensor
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

Participated in the
Build My Lab Contest
9 Comments
5 years ago
Great idea!
8 years ago on Introduction
Loved the awsm idea man. keep it up!
9 years ago on Step 4
http://pdf.datasheetarchive.com/datasheetsmain/Databooks-5/Document249186.pdf
9 years ago on Step 4
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 ?
Reply 9 years ago on Step 4
http://pdf.datasheetarchive.com/datasheetsmain/Dat...
9 years ago on Step 3
I like the idea! You have my vote.
Reply 9 years ago on Step 3
thank you
9 years ago on Introduction
What a great idea, good work. Voted.
Reply 9 years ago on Introduction
thank you