Tank Level Indicator (3 probes)

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.

13 wires to prepare; 369mm total wire, including end allowances.

Parts List

6 unique parts

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2. Cut wires

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

Total wire: 369mm (14.5in)

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 — PROBE_HI — N8 → N5 — 18mm — Red

Cut 18mm.

Wire 2 — COLL_HI — E13 → I13 — 20mm — Yellow

Cut 20mm.

Wire 3 — COLL_LOW — E25 → I25 — 20mm — White

Cut 20mm.

Wire 4 — COLL_MID — E19 → I19 — 20mm — Green

Cut 20mm.

Wire 5 — PROBE_MID — N14 → K4 — 43mm — Blue

Cut 43mm. Bend 90° left at 30mm.

Wire 6 — PROBE_LOW — N20 → I4 — 68mm — Black

Cut 68mm. Bend 90° up at 8mm. Bend 90° left at 48mm.

Wire 7 — VCC — F8 → F5 — 18mm — Red

Cut 18mm.

Wire 8 — VCC — G4 → C3 — 23mm — Yellow

Cut 23mm. Bend 90° left at 8mm.

Wire 9 — VCC — H8 → H14 — 25mm — White

Cut 25mm.

Wire 10 — VCC — F14 → F20 — 25mm — Green

Cut 25mm.

Wire 11 — GND — D5 → J10 — 38mm — Blue

Cut 38mm. Bend 90° right at 18mm.

Wire 12 — GND — I11 → I17 — 25mm — Black

Cut 25mm.

Wire 13 — GND — K17 → K23 — 25mm — Red

Cut 25mm.

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.