 shawn
|
8080ef8940
|
I2S HAT: complete PCB with all footprints placed, Gerbers exported
- Generated complete PCB file via pcbnew API (KiCad 9.0 format)
- All 22 components placed: J1 (2x20 header), U1 (AMS1117), C1-C4 (decoupling),
J2 (input jack), U2 (TL072), R1-R4 (preamp), C5 (DC-block), U3 (PCM1808),
C6-C7 (ADC decap), U4 (PCM5102), C8-C9 (DAC decap), R5/C10 (output filter),
J3 (output jack), R6 (buffer feedback)
- GND flood fill on both layers
- DRC: 14 minor warnings (solder mask bridges + outline intersections — expected)
- Gerbers exported: 9 layers + NC drill + JLCPCB CPL file
- Handoff doc: hardware/I2S-HAT-HANDOFF.md
|
2026-06-09 19:01:32 -04:00 |
|
|
shawn
|
0ae2ca6e8e
|
feat: PCM1808+PCM5102 I2S HAT design files
Custom I2S HAT for Pi Multi-FX Pedal — full hardware package:
- KiCad project: schematic (kicad_sch), PCB layout (kicad_pcb), project file
- Custom DT overlay: pcm1808-pcm5102-overlay.dts (no upstream overlay exists for PCM1808)
- docs/hardware-bom.md: BOM (9.25 HAT + 1.75 with enclosure), wiring diagram, PCB design notes
- docs/config-audio.md: DT overlay build, ALSA config, JACK integration, troubleshooting
- scripts/install_hat.sh: One-command install + test suite (6 tests)
- hardware/gerber/: JLCPCB fab instructions and assembly notes
Circuit: Guitar input → TL072 preamp (gain ~20dB) → PCM1808 ADC → RPi I2S
→ PCM5102 DAC → RC filter → output jack
I2S: BCLK/GPIO18, LRCLK/GPIO19, DIN/GPIO20, DOUT/GPIO21
Stacking header passes all 40 GPIO pins for footswitches/LEDs/display
|
2026-06-07 23:52:13 -04:00 |
|