I suspect for clearance reasons you are going to want the accellrometer board to be on the bottom of the board and the mini on the top of the board (or visa versa). So you want one of the other of them to be on the other side of the board. In Inspector the pcb layer setting will move one or the other to the bottom of the board. At present they are both on the top. Moving one to the bottom changes the trace routing which is why you need to do it now. I’d also suggest moving the accelrometer as far towards the bottom of the mini as you can (away from the antenna at the top of the board). It may interfere with the antenna and you can move it without incurring any more board room (the mini will be extending down that far anyway.)
It looks like it but the underlying parts aren’t the best. The holes are a little too large for .1 headers.
Yes. Export the gerber files from Fritzing
File->export->for production->Extender gerber
will export the board in gerber format.
the top of the drill.txt file that it generates tells me the drill holes are not right (they may however work):
; NON-PLATED HOLES START AT T1
; THROUGH (PLATED) HOLES START AT T100
M48
INCH
T1C0.086614
T100C0.036111
T101C0.039370
T102C0.098425
for .1 headers you want a drill hole of 0.038inches, the T100C0.036111 one will likely get rounded up to 0.038, but the T101C0.039370 one will round up to 0.042 very likely which is a bit large. This is a feature (or rather a misconfiguration) in the parts and can be fixed by fixing the parts. Displaying the files in a gerber viewer (this is from gerbv, a free gerber viewer from the geda project) of the complete board:
This one is only the top silk and the drill layer (the purple circles are what will be drilled)
before ordering boards you should always look over the gerber files in a viewer. Sometimes it looks fine in Fritzing but has errors in the gerber output (and the gerber output is what you will get from the board house).
other than the hole sizes (which i will have a look at after I start another long running job in a while) it will work as is. Although I don’t often make boards, best practice says come out straight from the pad, bend at 45 degrees and go straight back in to the pad on the other end (with all bends at 45 degrees). That said at I2C speeds this will work just fine.
Peter
