Photo Detector circuit question? - Electronic Circuits Projects Diagrams Free

excetara2 · 5th May 2008, 11:44 PM

I am using part number: OPB607A. It is an object sensor. I was wondering the circuit to get it working. I have a 1K from emitter to ground and a 160 ohm on the diode to limit current. It acts like it is always detecting. I get a voltage around 3.8V across the emitter to ground. Am I hooking this up right?

mneary · 5th May 2008, 11:58 PM

You only tell half of your pin connections. I would normally use:

1 +5V
2 1K to ground
3 +5V
4 160 to ground

NOTE that pins 1 and 3 are on opposite corners of the device!

Try disconnecting the LED and see if the voltage stays the same. Be sure that the detector is shaded from ambient.

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5th May 2008, 11:44 PM	(permalink)
excetara2	Photo Detector circuit question? I am using part number: OPB607A. It is an object sensor. I was wondering the circuit to get it working. I have a 1K from emitter to ground and a 160 ohm on the diode to limit current. It acts like it is always detecting. I get a voltage around 3.8V across the emitter to ground. Am I hooking this up right?

5th May 2008, 11:58 PM	(permalink)
mneary	You only tell half of your pin connections. I would normally use: 1 +5V 2 1K to ground 3 +5V 4 160 to ground NOTE that pins 1 and 3 are on opposite corners of the device! Try disconnecting the LED and see if the voltage stays the same. Be sure that the detector is shaded from ambient.