AVR-Chat

Larry Barello wrote:
> This isn't my experience.  I find wide variations among sensors -
> particularly after soldering them into boards.  Even sensors that are
> suppose to have tight tolerances.  And incidental environmental light
> can make the situation even worse.

Of course, it all depends on technique.
I for one, always make sure the light from the source will be the only one
to hit the receiver.
The best way to do that is creating a dark tunel for the source (minimum
2"), and a 2 to 3" dark tunel for the receiver with 2 black disks in between
the opening and the sensor. A small hole (3mm) aligned to the source will
eliminate almost completely any external interference.  Just the straight
light from the source will hit the sensor. The two disks with the hole, 1"
apart will create a narrow angle of light hiting the sensor.

Of course, in nature everything is exposed to imperfections, but we can try
to improve it by all means.




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