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thePunderWoman merged 1 commit into from
Aug 23, 2026
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Added readme for the diagrams #23

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39 changes: 26 additions & 13 deletions PCB/README.md
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Expand Up @@ -4,19 +4,32 @@ A wireless handheld controller for R2-D2 droid operation, designed for use at pu

## Hardware Overview

| Component | Part | Notes |
|---|---|---|
| MCU | ESP32-S3-WROOM-1 module | Pre-certified: integrated flash, crystal, WiFi/BT radio + antenna. Same MCU family as Amidala. See `GPIO_table.md` for the full support circuitry |
| Display | SSD1306 1.3" OLED | 128x64, monochrome, I2C |
| Radio | XBee3 | Zigbee, SPI mode, THT socket (proto) |
| Hall trigger | DRV5055A2 | Ratiometric linear hall effect, 3.3V |
| Thumbstick | GuliKit hall effect module | Native 3.3V, analog X/Y + click |
| Buttons | Omron B3F series | Tactile momentary clicky |
| RGB LED | SK6812 NeoPixel-compatible | RMT-driven, 3.3V native, single LED status indicator |
| Charger | bq25185 | USB/DC input, power path, 4.2V/500mA |
| Buck | TLV62569 | 3.3V output, 1A |
| Battery | 18650 or 14500 Li-ion | Swappable single cell, TBD empirically |
| Power switch | DMG2305UX + 2N7002 | Soft latch, hybrid hardware+firmware |
| Component | Part | Notes | Layout diagram |
|---|---|---|---|
| MCU | ESP32-S3-WROOM-1 module | Pre-certified: integrated flash, crystal, WiFi/BT radio + antenna. Same MCU family as Amidala. See `GPIO_table.md` for the full support circuitry | — |
| Display | SSD1306 1.3" OLED | 128x64, monochrome, I2C | — |
| Radio | XBee3 | Zigbee, SPI mode, THT socket (proto) | — |
| Hall trigger | DRV5055A2 | Ratiometric linear hall effect, 3.3V | — |
| Thumbstick | GuliKit hall effect module | Native 3.3V, analog X/Y + click | — |
| Buttons | Omron B3F series | Tactile momentary clicky | — |
| RGB LED | SK6812 NeoPixel-compatible | RMT-driven, 3.3V native, single LED status indicator | — |
| Charger | bq25185 | USB/DC input, power path, 4.2V/500mA | [diagram](diagrams/power_charger_layout.md) |
| Buck | TLV62569 | 3.3V output, 1A | [diagram](diagrams/power_buck_layout.md) |
| Battery | 18650 or 14500 Li-ion | Swappable single cell, TBD empirically | — |
| Power switch | DMG2305UX + 2N7002 | Soft latch, hybrid hardware+firmware | [diagram](diagrams/power_control_layout.md) |

## Layout Diagrams

Suggested top-copper floorplans for the three sheets with real layout
stakes — a switching regulator, a linear charger with a thermal pad, and
the transistor carrying the whole board's current. Each is checked
against the actual component datasheet, not just the schematic. See
[`diagrams/README.md`](diagrams/README.md) for the full list and how the
files are organized.

- [Buck converter](diagrams/power_buck_layout.md) — `power_buck.kicad_sch`
- [Charger](diagrams/power_charger_layout.md) — `power_charger.kicad_sch`
- [Power latch](diagrams/power_control_layout.md) — `power_control.kicad_sch`

## GPIO Assignment

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15 changes: 15 additions & 0 deletions PCB/diagrams/README.md
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# PCB Layout Diagrams

Suggested top-copper floorplans for the sheets in this project with real
layout stakes — tight switching loops, thermal pads, or current-carrying
parts — derived from the schematic plus the actual component datasheets,
not guessed. Model your KiCad layout after these rather than placing
parts from scratch.

## Diagrams

| Diagram | Sheet | Why it needed one |
|---|---|---|
| [Buck converter](power_buck_layout.md) | `power_buck.kicad_sch` | Switching regulator — tight input loop, short switch node, feedback routed clear of noise |
| [Charger](power_charger_layout.md) | `power_charger.kicad_sch` | Linear charger in a WSON-10 — thermal pad via array is the whole story |
| [Power latch](power_control_layout.md) | `power_control.kicad_sch` | One transistor carries the entire board's current; the power button's position is a mechanical constraint, not an electrical one |
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