![]() one with a square SMD pad and one with a round SMD pad. you typically put the corner one on coordinates o.o _ / \ | O | | | | | | | | | | | | | | _ | ||_| O | \_/ the square one is centered at 0:0 the others sit at 0,x and y,0 You need these on top and bottom lyer ( if you have parts on both sides ) You need to make 2 pcb footprints. ( that means : at three corners of the board ) The one in the corner of the L has a different shape than the others. ![]() You need 3 of them and they need to be placed in an L shape. A fiducial is a coordinate mark used by the pick and place robot to align the stage to the board. ![]()
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