Update README with accurate hardware details and PCB render

- Add PCB 3D render as hero image, move schematic to bottom
- Fix buck converter to SY8368AQQC (was TPS54560)
- Add RCA stereo outputs, detail all audio outputs
- Add button/connector table from Arduino MIDI schematic
- Add connectivity table with correct USB port descriptions
- Add dual micro HDMI outputs (touchscreen + debug)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -1,12 +1,12 @@
 # TriMixxx
 
-A custom CDJ (Compact Disc Jockey) unit built from scratch around a Raspberry Pi CM5, designed to run [Mixxx](https://mixxx.org/) DJ software. Features a custom PCB, a custom 3D-printed chassis, and reuses original CDJ buttons and jog wheel for an authentic DJ experience.
+A custom CDJ (Compact Disc Jockey) unit built from scratch around a Raspberry Pi CM5, designed to run [Mixxx](https://mixxx.org/) DJ software. Features a custom PCB, a custom 3D-printed chassis, and reuses original CDJ buttons and jog wheel for an authentic DJ experience. Reads Rekordbox-formatted USB sticks — no laptop required.
 
-![Full schematic](screenshots/Screenshot%202026-02-08%20at%2019.56.48.png)
+![PCB 3D render](screenshots/pcb-3d-render.png)
 
 ## What is this?
 
-TriMixxx replaces the internals of a CDJ with modern, open-source-friendly hardware while keeping the physical controls that DJs know and love. Plug in a Rekordbox-formatted USB stick, and you're ready to mix — no laptop required.
+TriMixxx replaces the internals of a CDJ with modern, open-source-friendly hardware while keeping the physical controls that DJs know and love. Plug in a Rekordbox-formatted USB stick, and you're ready to mix.
 
 ## Hardware Architecture
 
@@ -17,27 +17,50 @@ TriMixxx replaces the internals of a CDJ with modern, open-source-friendly hardw
 ### Audio
 
 - **TI PCM5242** — high-quality stereo DAC connected over I2S for low-latency audio output
-- **Dual audio outputs** — 6.35mm (1/4") and 3.5mm headphone jacks
+- **RCA stereo pair** — Left (white) and Right (red) main outputs
+- **6.35mm (1/4") headphone jack**
+- **3.5mm headphone jack**
 
 ### MIDI Controller
 
-- **ATmega32U4** — acts as a USB MIDI class-compliant device, reading the original CDJ's buttons, encoders, and jog wheel and translating them into MIDI messages for Mixxx
+- **ATmega32U4** — acts as a USB MIDI class-compliant device, reading the original CDJ's buttons, encoders, fader, and jog wheel and translating them into MIDI messages for Mixxx
 - **16 MHz crystal** oscillator for reliable USB timing
 
+All controls connect via JST PH connectors to the main PCB:
+
+| Connector | Controls |
+|---|---|
+| **J_PLAY** (6-pin) | Play button + LED, Cue button + LED |
+| **J_LOOP** (8-pin) | Loop In button + LED, Loop Out button + LED, Reloop button + LED |
+| **J_MASTER_TEMPO** (4-pin) | Master Tempo button + LED |
+| **J_ENCODER_BACK** (7-pin) | Back/browse rotary encoder + Back button + LED |
+| **J_TEMPO** (5-pin) | Tempo fader (analog ADC input) + Tempo Reset button + LED |
+| **J_JOG** (4-pin) | Jog wheel quadrature encoder (JOG1/JOG2) |
+| **J_TOUCH** (2-pin) | Jog wheel capacitive touch sensor |
+
+**Summary of buttons:** Play, Cue, Loop In, Loop Out, Reloop, Master Tempo, Tempo Reset, Back — each with a corresponding LED. Plus a tempo fader (analog), a browse/back rotary encoder, a jog wheel (quadrature encoder), and a jog wheel touch sensor.
+
 ### Power
 
-- **USB-C power input** with **CH224K** USB PD negotiation (requests 20V)
+- **USB-C power input** with **CH224K** USB PD negotiation (requests 20V @ 3A = 60W, peak draw 42.4W)
-- **TPS54560** buck converter stepping 20V down to 5V for the CM5 and peripherals
+- **SY8368AQQC** synchronous buck converter stepping 20V down to 5V for the CM5 and peripherals
 - **AP2112K** 3.3V LDO for logic-level components
 - **AP2553W** USB power switches for safe hot-plug on DJ USB ports
 
 ### Connectivity
 
-- **USB 3.0 Type-A port** — for Rekordbox USB sticks
+| Port | Type | Speed | Purpose |
-- **HDMI output** — for an optional display (waveforms, library browsing)
+|---|---|---|---|
-- **USB-C** — power delivery and data
+| **USB-A** | Full-size | USB 3.0 SuperSpeed | Rekordbox USB sticks |
-- **HD3SS3220** USB-C orientation mux and **HD3SS3212** USB 3.0 signal switch for proper USB-C handling
+| **USB-A** | Full-size | Power only (no data) | Auxiliary power for gadgets/lights |
-- **Ethernet** (via CM5) for network connectivity
+| **USB-C** | Receptacle | USB 2.0 | General connectivity |
+| **Micro HDMI** | Type D | HDMI 1.4 | 10" touchscreen display |
+| **Micro HDMI** | Type D | HDMI 1.4 | Debug/secondary screen |
+| **Ethernet** | RJ45 (via CM5) | Gigabit | Network connectivity |
+
+Additional internal USB: USB 3.0 Type-A for the touchscreen's USB touch interface.
+
+- **HD3SS3220** USB-C orientation mux and **HD3SS3212** USB 3.0 signal switch for proper USB-C handling on the DJ stick port
 
 ### Protection
 
@@ -54,18 +77,18 @@ Designed in Fusion 360 with a custom top panel and bottom tray that fits the ori
 ## Project Structure
 
 ```
-CDJ-MainBoard/              KiCad PCB project (6-layer board)
+CDJ-MainBoard/              KiCad PCB project
 ├── CDJ-MainBoard.kicad_sch     Root schematic
 ├── arduino_midi.kicad_sch      ATmega32U4 MIDI controller subsystem
-├── audio_outputs.kicad_sch     DAC and audio output stage
+├── audio_outputs.kicad_sch     DAC and audio output stage (RCA + headphones)
 ├── power.kicad_sch             Power supply (USB-C PD, buck, LDOs)
-├── hdmi.kicad_sch              HDMI output
+├── hdmi.kicad_sch              Dual micro HDMI outputs + Ethernet
-├── usb_dj_ports.kicad_sch      USB 3.0 host port for DJ USB sticks
+├── usb_dj_ports.kicad_sch      USB ports (DJ stick, aux power, connectivity)
 ├── test_points.kicad_sch       Test points for debugging
 └── CDJ-MainBoard.kicad_pcb     PCB layout
 
 JLC2KiCad_lib/              Component library (symbols, footprints, 3D models)
-kicad-thirdparty-footprints/    Third-party footprints (CM5, DAC, connectors)
+kicad-thirdparty-footprints/    Third-party footprints (CM5, DAC, RCA jacks)
 *.f3d                       Fusion 360 chassis models
 *.net                       Exported netlists (various revisions)
 ```
@@ -74,7 +97,7 @@ kicad-thirdparty-footprints/    Third-party footprints (CM5, DAC, connectors)
 
 - **[Mixxx](https://mixxx.org/)** — open-source DJ software running on Raspberry Pi OS
 - **Rekordbox USB support** — reads Rekordbox-exported USB sticks for seamless library access
-- **MIDI mapping** — the ATmega32U4 presents as a standard USB MIDI device, so Mixxx sees the jog wheel, buttons, and knobs as native MIDI controls
+- **MIDI mapping** — the ATmega32U4 presents as a standard USB MIDI device, so Mixxx sees the jog wheel, buttons, and fader as native MIDI controls
 
 ## Tools Used
 
@@ -83,6 +106,10 @@ kicad-thirdparty-footprints/    Third-party footprints (CM5, DAC, connectors)
 - **JLC2KiCad** — importing JLCPCB component libraries into KiCad
 - **JLCPCB** — PCB fabrication and assembly
 
+## Schematic
+
+![Full schematic](screenshots/Screenshot%202026-02-08%20at%2019.56.48.png)
+
 ## License
 
 This is a personal hardware project. Feel free to use it as reference for your own builds.