57 lines
2.1 KiB
Markdown
57 lines
2.1 KiB
Markdown
# Pinout
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This project uses an Arduino Mega 2560 with an `HV5812P` high-voltage shift register / latch driver.
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The sketch in [VFDStandalone.ino](/home/adebaumann/development/arduino_gauge_controller/VFDStandalone/VFDStandalone.ino:1) currently expects these logic connections.
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## Arduino Mega 2560 -> HV5812P
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| Mega Pin | Mega Function | HV5812P Signal | Notes |
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|---|---|---|---|
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| `D51` | `MOSI` | `DATA` / `DIN` | Serial data into the HV5812P |
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| `D52` | `SCK` | `CLOCK` / `CLK` | Shift clock |
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| `D53` | `SS` | `LATCH` / `STROBE` | Transfers shifted bits to the outputs |
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| `D49` | GPIO | `BLANK` / `OE` | Optional. Set `kHvBlankPin = -1` in the sketch if unused |
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| `GND` | Ground | Logic `GND` | Mega and HV5812P logic ground must be common |
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## HV5812P Outputs -> VFD Tube
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| HV5812P Output | Function |
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|---|---|
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| `HVOut1` | Segment `A` |
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| `HVOut2` | Segment `B` |
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| `HVOut3` | Segment `C` |
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| `HVOut4` | Segment `D` |
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| `HVOut5` | Segment `E` |
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| `HVOut6` | Segment `F` |
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| `HVOut7` | Segment `G` |
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| `HVOut8` | Decimal point segment |
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| `HVOut9` | Alarm bell segment |
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| `HVOut10` | Digit grid 1 |
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| `HVOut11` | Digit grid 2 |
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| `HVOut12` | Digit grid 3 |
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| `HVOut13` | Digit grid 4 |
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| `HVOut14` | Indicator grid between digits 2 and 3 |
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## Serial Input Format
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Examples supported by the sketch:
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- `1234` -> digits only
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- `1234.` -> decimal point on
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- `1234!` -> alarm bell on
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- `1234.!` -> decimal point and alarm bell on
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## Power and Safety Notes
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- The Arduino `5V` pin is for the logic side only.
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- The HV5812P also needs its required logic supply and high-voltage supply per the datasheet.
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- The VFD filament, grid, and segment high-voltage wiring are separate from the Arduino logic pins.
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- Do not connect any high-voltage VFD node directly to the Arduino Mega.
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- If the blanking behavior is inverted on your board, change `kBlankActiveHigh` in the sketch.
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## Important
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This file names the functional signals on the `HV5812P`, not the package pin numbers.
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If you want a package-pin wiring table too, I can add one once you confirm the exact datasheet variant / package orientation you are using.
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