request circuit for rpr-220 photoeye - Electronic Circuits Projects Diagrams Free

yeild · 1st March 2007, 05:06 PM

The circuits I have tried have only yeilded a output voltage change from .2V to .5V Any help would be appreciated. I am attaching the circuit that I have tried to use and also the data sheet for the sensor that I am using.

ericgibbs · 1st March 2007, 06:43 PM

hi yeild,
Looked at the spec and cct diagram, from what I can tell the change will
be small.

How are testing it to get the voltage change you posted ?

All I could find is a 'test cct'. Is this the way you are testing?

EricG

yeild · 1st March 2007, 06:55 PM

Hi Eric,

The test circuit pdf is how I am currently testing it. I will be hooking the Vout signal on the schematic to a input on a 8051 microcontroller.

RadioRon · 1st March 2007, 08:03 PM

I don't see anything wrong with the test schematic. Your drive LED bias current is fine. The collector load is fairly high, so you shouldn't have a gain problem. It should switch between 0 and 5 volts. You may have these problems:

- incorrect wiring of components
- too much light entering the sensor at all times. Try blocking all light from the sensor to see if the transistor will then switch off.

yeild · 1st March 2007, 08:05 PM

Thanks RadioRon

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1st March 2007, 06:43 PM	#2
ericgibbs	hi yeild, Looked at the spec and cct diagram, from what I can tell the change will be small. How are testing it to get the voltage change you posted ? All I could find is a 'test cct'. Is this the way you are testing? EricG Attached Thumbnails Last edited by ericgibbs; 7th July 2008 at 12:19 PM.

1st March 2007, 06:55 PM	#3
yeild	Hi Eric, The test circuit pdf is how I am currently testing it. I will be hooking the Vout signal on the schematic to a input on a 8051 microcontroller.

1st March 2007, 08:03 PM	#4
RadioRon	I don't see anything wrong with the test schematic. Your drive LED bias current is fine. The collector load is fairly high, so you shouldn't have a gain problem. It should switch between 0 and 5 volts. You may have these problems: - incorrect wiring of components - too much light entering the sensor at all times. Try blocking all light from the sensor to see if the transistor will then switch off. __________________ RadioRon