For my grandson I am designing project PCB with a Arduino UNO onboard.
I am stuck on the physical pin header placement for the UNO. I have an UNO clone here and Sparkfun blank PCB shield which I thought might be helpful whilst laying out the UNO part of this project, unfortunately the two have physically different header placement between the headers? I now don’t know which one to trust?
To add to the confusion the spacing on the Arduino R3 module in the KiCad library is different to the physical measure boards I mentioned above.
I have looked on the Arduino site to see if I couldn’t find an official header pin header placement with dimensions and have been unable to locate it if it exists?
If anyone can confirm what the distance is between the A0-A5 (6pin) > 5V, 3.3V, GND (8 pin) headers and between the PD0-PD7 (8 pin) > PB0-PB5, GND, AREF, PC4-PC5 (10 pin) header.
The discrepancies are around 0.9mm to 1.20mm enough to be off pitch if I get it wrong.
Any assistance in clarifying the correct spacing would be greatly appreciated.