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Add Canjector Major variant — all three variants now documented

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- Start: Bus origin, no termination
- Middle: Intermediate, switchable 120Ω
- Major: End of bus, fixed 120Ω termination
- Blue PCB render with TERM label and 120Ω resistor visible
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MrC
2026-05-04 01:40:10 +00:00
parent 0eda5b77f7
commit b8aa72caba
2 changed files with 13 additions and 9 deletions
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sources/2890/canjectors.md
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@@ -58,15 +58,9 @@ Chris designed three Canjector variants for different positions in the CAN bus t
|---------|----------|----------------|-------|
| **Start** | Bus origin (PDH side) | No termination at this end | Upstream CAN connector from PDH |
| **Middle** | Intermediate nodes | Switchable 120Ω | 3 CAN connections + 12V passthrough |
| **End** | Bus terminus | Fixed 120Ω termination | Final node on the bus |
| **Major** | Bus terminus (end of line) | Fixed 120Ω termination | Final node — TERM switch, 120Ω resistor populated |
## Files
| File | Description |
|------|-------------|
| `canjector-schematic.png` | Middle Canjector — EasyEDA schematic |
| `canjector-start-pcb.png` | Start variant — PCB layout (red solder mask) |
| `sources/2890/canjectors.md` | Full documentation |
**Major variant:** Blue PCB, three identical sections, TERM label, 120Ω termination resistor visible, PWR LED, 2-pin header. This is the end-of-bus variant — fixed 120Ω termination resistor must be populated. Zip file in `canjector-gerbers/` directory.
## Connection to Training
@@ -82,4 +76,14 @@ Chris experienced critical CAN failures at competition. The Canjector system is
## Notes for MrC
This is a **confidence builder** for the training vault — it shows Chris's practical engineering under pressure. Good story for students: identify the problem, study existing solutions, design your own, build it, test it. The full engineering cycle, not just code.
This is a **confidence builder** for the training vault — it shows Chris's practical engineering under pressure. Good story for students: identify the problem, study existing solutions, design your own, build it, test it. The full engineering cycle, not just code.
## Files
| File | Description |
|------|-------------|
| `canjector-schematic.png` | Middle Canjector — EasyEDA schematic |
| `canjector-start-pcb.png` | Start variant — PCB layout (red solder mask) |
| `canjector-major-render.png` | Major variant — 3D render, blue PCB |
| `canjectors.md` | This documentation file |
| `canjector-gerbers/` | Manufacturing files (Gerbers + drill files + How-to-order guide) |