homemade encoder issues

[chuckmerja]

we are having some issues while trying to make a single channel encoder using an NTE3100 (made our own 18 slot disk) <http://www.nteinc.com/specs/3100to3199/pdf/nte3100.pdf>. We think we have biased the 3100 thusly (we have tried with and without the 1 meg resistor)... <http://home.pacifier.com/~mcginty/nte3100.htm>

|+5VDC |+5VDC
\ \ Both Resistors
/ / 1 K ohm
\ \ Brown, Black, Red
/ /
| |
\| ---
| <-\ /
/| <-v
| ---
| |
Signal out----+------+ +----+
\ |
/ 1 Mega Ohm |
\ Brown, Black |
/ Green |
__|__ __|__
___ ___
_ _

We get 4.95 V when high (unblocked), but only drop a volt to about 3.8 V, so we never go low.

We are hooked to a "digital sidecar" and cRio. <http://www.usfirst.org/sites/default/files/uploadedFiles/Robotics_Programs/FRC/Game_and_Season__Info/2012_Assets/Digital%20Sidecar.pdf> <http://www.ni.com/compactrio/>

Any help would be greatly appreciated.

Thanks, Chuck.

[DonRotolo]

See my response in your other thread