Hi to all, for my home automation project i would like to use lots of MCP23017 expander for increase digital I/O pins of arduino (in my case Yun). As i wrote in this discussion Some problems with centipede Library - Arduino Yún - Arduino Forum i bought a centipede shield clone (only one available i…

Curious... I figured it would get good exposure here. :neutral_face:

Me too... :roll_eyes: so.. Do we consider the schematic as right? :stuck_out_tongue: I'll try to build the layout..

I think you may have trouble getting the board routed with that placement - you have a lot of signals to drop from the chips down to the connectors. You may have to lengthen the board left-to-right to make room. Or try rotating the chips 90 degrees.

Thanks for your suggestion, i'll give it a try! :wink: Some comments about schematic?

CrossRoads: I think you may have trouble getting the board routed with that placement - you have a lot of signals to drop from the chips down to the connectors. Yes, it's tight, but I think it can be done. I've just done up a quick proof of concept, and I think it will work. See the attached. I…

ShapeShifter: Yes, it's tight, but I think it can be done. I've just done up a quick proof of concept, and I think it will work. See the attached. I was originally having trouble with the capacitor, so I moved it. Then I ran into an impasse where the control bus signals couldn't be routed through…

This is what I've done until now. I didn't use autoroute, i prefered to do it manually. The problem is that DRC tells me that i've too little space between wires, too little width of wires and too little drill size. :sob: Some help? What is the min size of wires and vias for no DRC errors? [Ex…

10 mil (0.010 inch) traces on 25 mil (0.025 inch) centers with 13 mil (0.013 inch ) vias. (I'll leave it to you to figure the metric equivalents.) Well within the abilities of a board house like OSHpark without hitting the limits (except for vias which are right at the limit - I prefer vias a littl…

64 I/O Expander Shield for max 1024 I/O

Other Hardware Hardware Development

leen15 February 23, 2015, 3:22pm 8

CrossRoads:
I don't see anything needing changes.

Thanks!
So now layout time!

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64 I/O Expander Shield for max 1024 I/O

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