Being a newbie to sbRIO, I would like to build a simple Quadrature Counter.
Recently I attended the excellent Build Your Own Embedded System Workshop and have a sbRIO-9636 which is running a modified Quadrature Counter NI example project originally designed for the sbRIO-9631. It is working great using the digital encoder built into the daughterboard.
Next I want to use the encoder of a Lego Mindstorms NXT motor (PN 9842). I will power the motor externally so for now I just want to up/down count the encoder. Here is the wiring I plan to use on my daughterboard:
Channel A (yellow wire) of the encoder will go to DI2
Channel B (blue wire) of the encoder will go to DI3
0V Common (red wire) will go to DGND
+5VDC (green wire) will go to ???
So that's my question: is there a point on the daughterboard of the sbRIO-9636 that I can safely connect to for +5VDC encoder power? By the way, these wire colors are from the Lego Mindstorms extension cables when they are cut and stripped.
Any help would be appreciated!
Solved! Go to Solution.
According to the quick reference for the sbRIO 9636: http://www.ni.com/pdf/manuals/375933a.pdf
there appears to be +5VDC on pins 49 and 50 of the J502 connector. Is this connector available or are you using a daughterboard?
Other options would be more hackish IMO, such as drawing the 5V from the USB connector.
It does indeed have a daughter card, but the J502 pins are accessable from the top, so J502 it is. Thank you!