[chbot] Tips, 2nd attempt with attachment

[Richard Jones]

I was just checking an IR LED / Photo Transistor pair scavenged from a
mouse using the standard procedure. Resistor of a few K in series. Look for
the largest metal and hope its the cathode of the LED, check fwd volt drop
~1.4V & check with the web cam to see it light up. And I got to thinking
I'll bet not all of us know how a cheap web cam helps view infra red LEDs. 

So there it is, attached is the simple proof. 

Colour cams have an IR filter, but they are never perfect. 

Anyone else have any helpful tips that not quite everyone will know?
Richard
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