Adapter for one specifically qualified three-wire pulse-output water-flow sensor, producing telemetry and/or a fail-safe no-flow event.
Baseline documentation snapshot: 2026-10-11, before the requested connector/protection/usability revision program. New revision features require their own reviewed source and qualification evidence.
This page documents an unqualified engineering study, not a released or tested product. Saved CAD, renders and automated checks do not establish a safe assembly, compatible cable, firmware support or a usable current rating.
Board-specific qualification limits: Retained native and ordinary checks zero; timing, sensor pinout/sink, host, firmware, exact stock and physical qualification open;130 checklist items unsigned.
The canonical repository connector contract is pin 1 = +3.3 V, pin 2 = +5 V, pin 10 = GND. Current Smoothie V2 Prime web material appears to describe a conflicting header assignment; the physical target header must be continuity-checked against its authoritative schematic before KiCad release. The table below expresses design intent against the repository’s canonical contract, not proof of the live board pinout.
| Pin | Canonical role | Assigned function |
|---|---|---|
| 1 | +3.3V | +3.3 V rail |
| 2 | +5V | +5 V rail |
| 3 | GPIO! / type-specific | FLOW_PULSE_OUT |
| 4 | type-specific | N/C |
| 5 | type-specific | FLOW_FAULT_OUT (HIGH = missing pulses) |
| 6 | type-specific | N/C |
| 7 | type-specific | N/C |
| 8 | type-specific | N/C |
| 9 | type-specific | N/C |
| 10 | GND | Ground |
Power off before connecting or changing jumpers. Verify pin 1, signal direction, supply voltage and ground at both ends of every cable. A mechanically fitting connector is not proof of electrical compatibility. If a host pin mapping or current allocation remains unresolved in the design record, do not connect the board until it is resolved.
The following are specification requirements or study assumptions; they are not measured operating ratings. A newer selected-revision note takes precedence over historical draft options.
The design describes the following protection intent. Check the selected schematic and remaining qualification gates before relying on it:
See current review. Retain v10 SN74LVC2G14DBVR/SN74LVC1G123DCTR/TPD4E1U06DCKR; pulse timing is not replaced by LTC6993 without interface proof. Conditional V1 R1/bypass candidates; no IC-stock successor. Current selected v10; retained native/stock/physical qualification limits remain explicit.
Use the configuration and firmware contract for the exact selected revision. Do not copy another module’s socket assignments or assume that an unused pin is available. First-article work must verify source selection, reset/unplug behavior, cable orientation and the actual load or sensor interface before normal operation.
The following are requirements for the next design iterations; this page does not claim they are already fitted:
Documentation route: smoothieware.org/extensions/water-flow-sensor-adapter.
The 2026-10-11 upgrade program has saved additional candidates v11, v12, v13. These studies preserve the historical design described above. Their connector, LED, mechanical and protection changes are revision-specific and remain unqualified.
See the per-board changes, failures and remaining work and mandatory family specification. Use the source hash and native check for the exact candidate being reviewed; do not infer hardware ratings from a rendered population.
The three additional revisions are v11, v12, v13. They are engineering studies; saved CAD and renders do not release the hardware. The latest candidate is described below. Older baseline notes above remain historical.
093b7e3675310d23ddbdbab74a8ac2a0eced68085316596528af671bb1ae44bc.JST_PH_B3B-PH-K_1x03_P2.00mm_Vertical. Fit only the selected population; check its pin map and voltage in the design record.Applicable protection, current-path, thermal, pinout, cable access and physical tests remain open wherever the linked board record has not verified them. A zero native-error count does not close those gates.
The additive v18 native candidate adds a readable complete documentation URL and current revision labels while preserving the protected preceding circuit, placements, outline and electrical rules. Parent rechecks found zero enabled electrical errors, open connections or schematic-parity findings and clean schematic checks; 0 text-thickness warnings remain. All 12 declared populated/bare views and current manufacturing exports are source-bound. Earlier revision/component selections on this page are historical context. No current rating, sensor/host compatibility, optical or mechanical fit, purchasing savings or fabrication release is established.
PCB source SHA-256: 2a4f8b1486a7a88ca6f96bcfeec44377ca2bc22889698edf688e17fa0398fb10.
The keyed Gadgeteer supply feeds the board directly. This additive candidate removes 31 redundant input-warning/protection and auxiliary-supply parts, reducing 72 footprints to 41. The retained sensor-output TPS259631 limiter provides the nominal 125 mA setting, soft start and a disableable fault LED. Signal conditioning, clamps, host outputs and both sensor connector populations remain.
The limiter sits underneath a compact 26 × 28 mm nominal board, replacing the 40.31 × 24.26 mm edge bounding box. Native KiCad electrical, layout and full schematic-parity checks are clean after routing and unused-track removal. The 0.8 mm website label is on the front; its underlying ordinary via uses solder-mask tenting. All twelve normal/PH populated and bare top, bottom and isometric renders are complete and visually checked; their connector bodies are framed and the compact underside stage is shown. This is an unqualified engineering candidate: physical sensor/harness, insertion, timing, soft-start and current-limit checks remain open; fabrication release is false.