ASCOM Mount Dither
Worked for 28 sec
Final ERC/BOM/schematic checks are clean; no PCB placement/routing was started.
Thought for 21 sec
Implemented the schematic-only V1 revision: replaced the TLP291-4 with four TLP171A(TP,F) PhotoMOS relays, replaced SW1 with a true SPST ON/OFF switch, preserved the V2 archive, and updated the review docs.
Updated files:
Open items:
- No PCB placement/routing was started.
- J1 pin-1 marker and “ST-4 - STRAIGHT 1:1 6P6C ONLY” silkscreen note remain layout-stage tasks.
- Board outline, connector access, battery-holder position, and mounting method still need definition before placement.
Suggested next steps:
- Review/approve the corrected PhotoMOS schematic and BOM.
- Confirm SW1 = DS04-254-2-01BK-SMT is acceptable as the physical power switch.
- Confirm whether J2 should stay as a 1x03 UPDI header or change to test pads before layout.
Approve and prepare layout
Approve PhotoMOS schematic
Keep UPDI header
Define board outline
Verify RJ12 footprint
Review switch choice
Refine this doc
Ask about this doc
V2 USB Host Archive — Conditional Reference
Archive Point
The ESP32-S3 USB-host architecture was archived before the V1 redesign pivot to a minimal autonomous ST-4 dither timer.
- Archived project commit:
#5a204155— immediately after creating the USB Host Compatibility Bring-Up Plan. - Archived schematic summary: 295 schematic elements, 41 nets, ESP32-S3 USB-host command-link architecture with LiPo charging, USB-C charge input, 3.3 V buck-boost, 5 V boost, current-limited USB-A VBUS, USB data ESD, debug header, and sync I/O.
Archived V2 Project Files
Status
This V2 architecture is preserved only as a conditional archive. It is not the V1 baseline.
Use V2 only if the minimal ST-4 approach is later rejected or if a future version needs mount-command USB control through the 8409 USB interface.
V1 Pivot Decision
The new V1 baseline is a minimal autonomous ST-4 dither timer:
- No ESP32-S3.
- No USB host.
- No USB-A mount connection.
- No LiPo charger or 5 V boost subsystem.
- No display, Wi-Fi, Bluetooth, camera sync, or shutter output.
- AAA-powered, low-power MCU, opto-isolated ST-4 RA+/RA-/DEC+/DEC- contact closures.
Archive Point
Archived V2 Project Files
Status
V1 Pivot Decision
