LED Resistor Math

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.

9 wires to prepare; 217mm total wire, including end allowances.

Parts List

5 unique parts

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2. Cut wires

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

Total wire: 217mm (8.5in)

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 — D1 — C15 → C20 — 23mm — Red

Cut 23mm.

Wire 2 — D2 — H15 → H20 — 23mm — Yellow

Cut 23mm.

Wire 3 — D3 — M15 → M20 — 23mm — White

Cut 23mm.

Wire 4 — 5V — D10 → G10 — 18mm — Green

Cut 18mm.

Wire 5 — 5V — I10 → L10 — 18mm — Blue

Cut 18mm.

Wire 6 — 5V — C9 → C5 — 20mm — Black

Cut 20mm.

Wire 7 — GND — D5 → D22 — 53mm — Red

Cut 53mm.

Wire 8 — GND — C23 → H23 — 23mm — Yellow

Cut 23mm.

Wire 9 — GND — I22 → L22 — 18mm — White

Cut 18mm.

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.