AI Flow

adom-aiflow 0.2.21 · KiCad 10.0.7 (macOS) for ERC · project: a 4-layer board with 16 photodiodes (drew715/smart-laser-target)

What I did. netlist check (which runs the schematic check) on a schematic whose custom photodiode symbol (BPW34S, pin 1 K, pin 2 A) draws the cathode bar at the pin 1 end, the triangle as an open 3-point polyline pointing at it, and the triangle's base as a separate 2-point line:

(polyline (pts (xy -2.54 1.27) (xy -2.54 -1.27)) (stroke (width 0.1524)))   ; cathode bar, pin 1 (K) end
(polyline (pts (xy 0 1.27) (xy -2.54 0) (xy 0 -1.27)))                       ; triangle, open, apex at the bar
(polyline (pts (xy 0 -1.27) (xy 0 1.27)))                                    ; the triangle's base, pin 2 (A) end

Expected: no polarity error; the bar is at the cathode.

What happened (an error, so finish refuses):

polarity drawing: D1,...,D16 (smart_laser_target:BPW34S-Z, custom symbol): the cathode bar is drawn at the pin 2 end, but pin 1 (K) is the cathode, pin 2 (A) the anode

Why (schematic_symbols.rs, diode_check): a triangle is recognised only as a closed 3-point polyline, so tri is None here. Both vertical lines then qualify as bars with the same across extent (2.54 mm), and max_by returns the last of equal maxima, which is the triangle's base at the anode end (t = 0.33, under 0.4), so it reports an error.

Suggestions:

1. Recognise an open 3-point triangle whose base is a separate line (or join open polylines that share end points before matching).
2. When no triangle is found and two bars tie, prefer the thicker stroke, or report "cannot tell which end" as a warning rather than an error.

Worked around by closing the triangle in the symbol, which draws the same picture: (pts (xy 0 1.27) (xy -2.54 0) (xy 0 -1.27) (xy 0 1.27)). The check then reads the drawing correctly (0 errors on a preview run).

The same check reads a magnetic buzzer's +/- pins (MLT-8530, "Electromagnetic Passive (Externally Driven)") as amplifier inputs. spec.schematic.allowPassive with that reason covers it, which seems right, so nothing is asked there.