Infrared Light sensing with PIC16F877 - Electronic Circuits Projects Diagrams Free

emufambirwi · 5th October 2005, 12:51 PM

In scenario where I am supposed to detemine if two rectangular planar objects are aligned exactly, I decide to use an infrared led and phototransistor on each of two diagonally opposite corners on the two rectangular objects.

what will be effect of the width of the beam on the resulting signal into the PIC?

Will it not show alignement before fully aligning?

DJ_ReL@X! · 12th October 2005, 06:43 PM

The phototransistor won't give you a 5 V output. So you may want to use a comparator and adjust it to give 5 V when the objects are fully aligned.

You could use an external LM311 or one of the comparators included in 16F877A.

5th October 2005, 12:51 PM	(permalink)
emufambirwi Experienced Member	Infrared Light sensing with PIC16F877 In scenario where I am supposed to detemine if two rectangular planar objects are aligned exactly, I decide to use an infrared led and phototransistor on each of two diagonally opposite corners on the two rectangular objects. what will be effect of the width of the beam on the resulting signal into the PIC? Will it not show alignement before fully aligning? __________________ People perish because of lack of knowledge

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12th October 2005, 06:43 PM	(permalink)
DJ_ReL@X! New Member	The phototransistor won't give you a 5 V output. So you may want to use a comparator and adjust it to give 5 V when the objects are fully aligned. You could use an external LM311 or one of the comparators included in 16F877A.