Custom PCBs are now so cheap that if one does not work, just make another one I get them made in China $2 for five boards. That is 40 cents each. I've used these just to make a cable "detangle" with nothing but connectors and traces. For 40 cents it is worth it to eliminate a hand-wired rats nest I think we live in a new golden age for electronics hobby.
So if the Pi4 board does not fit, fix it and make another one. Generally, it takes a few interactions to get something perfect. After making anything we can see how we could have done better. If you use KiCAD to make the PCBs one neat thing you can do is export the PCB design as the 3D CAD model complete with the connectors and parts soldered down. It is pretty much just a mouse click. Then you can find an on-line 3D model for the Pi4. You can do the test fit in your CAD system and verify the parts fit. If you look there are some very accurate models of the Pi4 available. I just made an enclosure for a stack of boards that included a Pi and all the screws fit the first time. Some as tiny as M2. On Wed, Mar 18, 2020 at 11:08 AM dave engvall <dengv...@charter.net> wrote: > Hi, > > Or maybe it is web search dumb. Usually I do better but: > > I have the osh park board for Rpi4b to 7i90 ordered. However I think I > can plug a 40 pin (2 x 20) idc directly into the pi and come off the > other side of the board with a 26 pin (2x13) directly into the 7i90. No > cable to fool with. Just carefully making mounting that matches the > physical requirements. Using a right angle connector to get to the 7i90 > would make things neater. IOW 40 pin to osh-park board to 26 pin (R/A) > or straight to 7i90. > > My small mill now has glass scales (0.0002) on X and Y so making simple > stuff is easy, especially out of aluminum. I do almost nothing in Al so > I am continually amazed at how easy it mills. Especially with Zr > coating. Surplus Boeing from a long time ago; before they closed the > surplus store. > > Part numbers from Mouser, Digikey, Allied would be most helpful. > > TIA > > I suspect I'm house bound ... with a 100' leash to reach the shop for > several weeks but UPS/BBT (big brown truck) still works. Stats say one > is fairly safe unless you have a condition that makes you more vulnerable. > > This state has been really hit hard; the nursing home in Kirkland didn't > help. Even worse is that a person can pass it on before they have symptoms. > > > https://informationisbeautiful.net/visualizations/covid-19-coronavirus-infographic-datapack/?fbclid=IwAR0CAPMO2oHOLZyB07vBhdbLvAjUcQ6RiifnOZJDt6sdMrSV1MWL-2Y0bv8 > > Hang tough, be careful. > > Dave > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
