OUT is the remote, host-powered half of the custom nine-conductor extension. Its female DE-9 connects only to the dedicated cable from IN; its keyed 2 × 5, 1.27 mm Gadgeteer header presents the seven signals and the transported +5 V and ground to one downstream device. It regenerates Gadgeteer pin 1’s +3.3 V locally from that +5 V with a TPS70933DBVR. IN/OUT describe power flow, not signal direction: the seven copper signal paths remain bidirectional. This is not RS-232, level conversion, isolation, or a general DE-9 extension. Never attach a computer serial port or another supply source.
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: Three power gaps/DRCexit5,five ignored categories,independent/physical open;lost attempt unknown.
The DE-9 cable carries exactly seven separate 3.3 V logic signals, one GND, and one IN-fused +5 V. The upstream host’s +3.3 V rail is absent. Gadgeteer pin 1 receives only U1’s locally generated +3.3 V; it is never paralleled with the host rail. DE-9 shell and fasteners do not serve as ground and have no intentional circuit-GND copper contact.
| DE-9 numbered contact | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
|---|---|---|---|---|---|---|---|---|---|
| OUT Gadgeteer pin | 3 | 4 | 5 | 6 | 10 | 7 | 8 | 9 | 2 |
| OUT net | SIG3 | SIG4 | SIG5 | SIG6 | GND | SIG7 | SIG8 | SIG9 | CABLE_5V |
IN uses the identical numbered map. The selected female DE-9 is candidate RS PRO 528-3705; it mates cable pins. Confirm actual socket numbering from the mating face, which mirrors the male and PCB solder views. Use only a verified ≤1.0 m, all-nine, contact-n-to-contact-n custom cable, with at least 26 AWG +5 V and ground conductors. With power off, compensate meter leads and prove each intended conductor <0.5 Ω, each unintended contact pair and every contact-to-shell >1 MΩ. Measure loaded round-trip power drop. Forbid a null-modem cable, unknown commercial serial cable, and hot plugging.
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.
Current sealed-package review: v19 retained;14 purchased MPNs match,114own/2562 historical hashes.22uF stock candidate remains conditional/uninstalled,no successor. Three power-gap findings/five ignored categories/physical and independent-review gates remain open; lost monitor outcome unknown.
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/d-sub-to-gadgeteer-out.
The 2026-10-11 upgrade program has saved additional candidates v20, v21, v22. 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 v20, v21, v22. 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.
6004776325c435a066f132d23f0151c4de6b27c5ecffafd32bfcf7bff6219842.PinHeader_1x04_P2.54mm_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.
Protected source v25; current PCB SHA-256 0ecb09617a1a22caf214f748eedec55577eb7fe3c1e5d47de3deaf39aacd816c. Fresh native checks: zero enabled errors, opens, schematic mismatches and ERC findings; 2 PCB warnings remain. Electrical geometry/project rules unchanged; 109 historical files, 28 model entries,17 exports and12 current population images verified. All12 populated/bare views inspected. Full documentation URL remains absent; deliberate reflow is untested. Physical qualification remains open; no price or area savings claimed.