Experimental solenoid probe intended to reproduce the externally observable control, trigger, and alarm behaviour of a BLTouch-class probe.
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.
The retained design record states:
Actual v10 retains STM32G030/DRV5055 Hall-solenoid architecture and an existing exact V2 DCK protection array with refined manufacturer lands. See complete63-record/48-component review. No new numbered revision; prior blocked draft below remains historical context.
Board-specific qualification limits: 24opens/DRCexit5;mechanical/host power/markings/physical unqualified.
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 | Probe/status GPIO if combined |
| 4 | type-specific | N/C |
| 5 | type-specific | N/C |
| 6 | type-specific | Auxiliary GPIO |
| 7 | type-specific | PWM command |
| 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:
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/bltouch-like-probe.
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.
fcdc733c8ab324e51a5ecfcb3bd7ccb4a2ce013fb5b02fae499b5f8569dc3da7.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 former input PTC is replaced by a TPS259631 with reverse PFET, TPS3700 OV cutoff and a post-cutoff LM66200. The existing coil limiter is the pin-compatible auto-recovery TPS2553; Hall sensing, STM32, host wiring and solenoid flyback remain. The input limiter has a nominal 1.506 A setting; guaranteed 5 V hot margin for the retained 1.1 A target remains unqualified. Distinct OV and FAULT indicators, reverse blinking, controlled startup and each LED’s own disable link are actual native circuits. The added ideal diode follows the OV/current cutoff and blocks the direct externally powered load-to-PFET path when raw input is negative. Original signal ESD/raw-logic bypass limits remain; arbitrary powered-output overvoltage is not supported.
The 5 V OV setting is 5.400 V nominal, with 5.334233–5.465987 V reference/divider/bias corners. Ideal-diode input stays within its 5.5 V recommended range statically; cutoff overshoot below 6 V absolute maximum, negative auxiliary clamps over temperature, current limits, thermal behavior and source budgets require bench qualification. No manufacturing release. See native protection records for exact hashes, remaining routing and primary sources.
Protected source v17; current PCB SHA-256 b44750907ce8c8efdff9f8fb14e110d84a290d22b2a8824a1a30a59ebf3c1c0b. Fresh checks: zero enabled PCB errors/opens/parity and ERC errors; 79 PCB warnings. Electrical geometry, project rules and 181 historical files unchanged. Verified 174 model entries, 19 exports and 12 current population views, all inspected. Documentation URL placement pending. Documentation URL placement pending; inherited overlapping rear instructions remain Inherited native warnings and enabled-rule exclusions remain explicit Physical/thermal/current/connector-fit qualification open No priced or area savings established by annotation candidate.
The Gadgeteer input and user-wired servo header select a shared raw power rail through separate solder links. Shared input protection therefore remains justified. Existing revision v18 already fits the original 46 × 34 mm outline; this source audit does not create a new hardware revision.