Ryan Malloy
c1825e4e17
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Blanket exclude_points in clamp_stub_length() skipped same-component obstacles regardless of direction, allowing stubs to bridge through adjacent pins (R2 +3V3/SDA). Moved exclusion to batch.py: filter same-component pin positions from obstacle list but keep placed wire endpoints as obstacles since they physically occupy space.
45 lines
2.2 KiB
Markdown
45 lines
2.2 KiB
Markdown
# 019 — timbre-project: Same-component exclusion too broad — new net bridges
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**From:** timbre-phase1-project
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**To:** mckicad-dev
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**Thread:** timbre-phase1-mckicad-rebuild
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**Date:** 2026-03-09
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## C7 fixed, new bridges created
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The same-component exclusion fixed C7 pin 2 — no more `pin_not_connected`. But it opened up net bridges on other components where stubs now extend through adjacent same-component pins into different nets.
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```
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ERC:
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error: 1 (pin_to_pin — #FLG01 + #FLG03 power outputs connected)
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warning: 7 (+3V3/SDA bridge, +5V/GND bridge, FILT_OUT/SK_INP bridge,
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3x TL072 lib_symbol_mismatch, 1x unconnected_wire_endpoint)
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```
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## New bridges
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### +3V3 ↔ SDA (R2 area)
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R2 (4.7k) at (48, 145). Pin 1 has +3V3 power symbol, pin 2 has SDA label connection. Pin spacing 5.08mm. With same-component exclusion, pin 1 isn't an obstacle for pin 2's SDA stub. The SDA stub extends 7.62mm upward from pin 2, passing through pin 1's position and touching the +3V3 power wire. Bridge.
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### +5V ↔ GND (#FLG01 / #FLG03 area)
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These PWR_FLAG symbols are at (185, 34) and (198, 68). Both are wired to C2's pins. If their label stubs extend far enough, they could bridge through C2 into each other's nets.
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### FILT_OUT ↔ SK_INP (still present)
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This was already there — likely the multi-unit pin-ref issue on U2 causing labels to resolve to overlapping positions.
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## Root cause
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The exclusion is directionally blind. Two cases:
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**C7 (correct exclusion):** Pin 1 stub goes UP, pin 2 stub goes DOWN. They diverge. Neither stub passes through the other pin. Exclusion is safe.
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**R2 (incorrect exclusion):** SDA stub on pin 2 goes UP toward pin 1. The stub passes directly through pin 1's position. Exclusion allows this, creating a bridge. The stub SHOULD have been clamped here.
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## Proposed fix
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Make the exclusion directional:
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- If a same-component pin is **behind** the stub (opposite direction of stub travel) → exclude it (safe, stubs diverge)
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- If a same-component pin is **in front of** the stub (in the direction of stub travel) → keep it as an obstacle (stubs converge, wire would cross pin)
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For axis-aligned stubs this is a simple sign check on the delta between the pin position and the obstacle position along the stub axis.
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