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Topic: 5 pin optical encoder (Read 301 times) previous topic - next topic

Domnulvlad

So I've just found an optical encoder salvaged from a HP printer and I believe it's IR, but the ones I've used had 2 pins for emitter and 4 for receiver, but this one has 3 for receiver. I have attached a few photos of it, maybe someone can figure out how to use it with an Arduino or maybe just the pinout.
Thanks in advance. 

outsider

The 5th pin goes to the phototransistor's base, can be used to modify collector current for filtering, attenuation, etc.
http://www.vishay.com/docs/83725/4n25.pdf

Domnulvlad

Thanks, but... how would I connect it to the Arduino?

outsider

It's only used in specialized applications, you probably don't need it, just ignore it, it will work just as well.

wvmarle

Quality of answers is related to the quality of questions. Good questions will get good answers. Useless answers are a sign of a poor question.

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