Infrared Proximity Sensing Coffee Table Module & Color Changing Glowing Faucet

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Author:grahmaustin

I want to build everything

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This video can be found on youtube.
http://www.youtube.com/watch?v=h5n0rw8wo14
Check out the other one, and some other of my videos


This is merely an instructable to explain how this device operates. I hope everything is not too obfuscated.


This prototype consists of three 8x8” modules. Each module operates independently of each other. Each module consists of 4 “pixels”. Each pixel is 4 inches square and consists of 21 LEDs, two IR emitting diodes, and two IR photodiodes. The mode of sensing is active infrared.

Check out my Color Changing Glowing Faucet
http://www.youtube.com/watch?v=mBzTNcXIbWA

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Step 1Infrared Sensor

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The IR sensor is a simple voltage divider former by two parallel IR photodiodes which are wired reversed biased. When a photodiode is reversed biased (like an LED connected up backwards) it acts like a variable resistor which changes resistance with respect to the amount of light (mainly infrared light) falling on it. The high resistance of the second static value 1 Megohm (R2) provides a voltage divider with the dividing node rising in voltage with an increase in IR light falling onto the photodiodes(R1).

V-in is 5 volts.

 

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