Connecting a NPN sensor to a DIO

[dacad]

Using a USB 6221 (or any std DAQ w/ DIO's) and want to connect an NPN sensor to activate a vi.  This will be to replace existing mechanical finger switches for ergonomic reasons.  The new sensor is an optical, no-touch switch.

Only vaguely familiar with transistor technology and am not sure how to make the connections.

The device I am trying to use is detailed here:  http://info.bannersalesforce.com/xpedio/groups/public/documents/literature/28436.pdf

It is the OTBVN6 model shown in the upper left of page 2 of this document.

The device requires a minimum of 10vdc so not sure what I need to do to connect it to a DIO.

Thanks for any input

Doug

[K C · Accepted solution]

Hi Doug,

You can use the attached schematic to connect your device to a digital input. You can use the n.c. or n.o. output.

The resistor will limit the maximum current to 10mA with a 10Vdc power connected to Vcc. If you connect the 5V from your DAQ device to the Vcc connection you can leave out the zenerdiode.

Kees

[dacad]

Thanks,

I will give that a try.

I actually did get it to function with a DIO by connecting the NO to 5vdc from the DAQ and the NC to the DIO.  (This after I blew one of the DIO's, I can't help trying things....)  

Not sure why this works bit will set up your option as it is probably a lot safer for the DAQ

Doug