Railroad Crossing Flasher

1. Prepare

Verify component pinouts against each manufacturer’s datasheet before wiring. Label cut wires with their wire numbers; the same numbers follow them through every stage. Wire colors are written out for black-and-white printing. Custom colors can be named in the wire library.

Progress is saved on this browser for this board revision. Changes to the board or measurements start a new checklist. Printed diagrams are references, not life-size templates.

14 wires to prepare; 329mm total wire, including end allowances.

Parts List

6 unique parts

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2. Cut wires

14 wires · +5mm per end for lead-through

Total wire: 329mm (12.9in)

3. Bend wires

Use the straight-line ruler to mark bend points on the wire before bending. Use the bent shape as a visual reference while bending.

Wire 1 — COL1 — D16 → D23 — 28mm — Red

Cut 28mm.

Wire 2 — COL1 — E24 → E22 — 15mm — Yellow

Cut 15mm.

Wire 3 — COL2 — L16 → K22 — 28mm — White

Cut 28mm. Bend 90° left at 20mm.

Wire 4 — COL2 — J23 → L23 — 15mm — Green

Cut 15mm.

Wire 5 — GND — I5 → I20 — 48mm — Blue

Cut 48mm.

Wire 6 — GND — J19 → F19 — 20mm — Black

Cut 20mm.

Wire 7 — 5V — D11 → D9 — 15mm — Red

Cut 15mm.

Wire 8 — 5V — F11 → J11 — 20mm — Yellow

Cut 20mm.

Wire 9 — 5V — L11 → L9 — 15mm — White

Cut 15mm.

Wire 10 — 5V — E10 → H5 — 30mm — Green

Cut 30mm. Bend 90° right at 18mm.

Wire 11 — BASE1 — E16 → E21 — 23mm — Blue

Cut 23mm.

Wire 12 — BASE1 — G21 → K25 — 24mm — Black

Cut 24mm.

Wire 13 — BASE2 — K16 → K21 — 23mm — Red

Cut 23mm.

Wire 14 — BASE2 — I21 → E25 — 24mm — Yellow

Cut 24mm.

4. Place wires

Component side. Select a wire to emphasize its route in its own color and highlight its endpoints. Wires follow number order, matching the bend guide and solder checklist.

5. Solder connections

Bottom view: horizontally mirrored. Coordinate names still identify the same physical holes. Highlights mark wire endpoints; wire routes belong on the component side. Check each connection and the listed solder bridges.

Board is horizontally mirrored. Column A is on the right.