shawn
0ae2ca6e8e
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
79 lines
2.4 KiB
Plaintext
79 lines
2.4 KiB
Plaintext
(kicad_pcb (version 20240124) (generator "kicad")
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(general
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(thickness 1.6)
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(drawings 0)
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(tracks 0)
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(zones 0)
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(modules 0)
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(nets 12)
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)
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(page A4 portrait)
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(title_block
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(title "Pi Multi-FX Pedal — PCM1808+PCM5102 I2S HAT")
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(date "2026-06-07")
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(rev "1.0")
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(company "Ourpad Networks")
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)
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(layers
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(0 "F.Cu" signal)
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(31 "B.Cu" signal)
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(36 "B.Paste" user)
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(37 "F.Paste" user)
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(38 "B.SilkS" user)
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(39 "F.SilkS" user)
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(40 "B.Mask" user)
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(41 "F.Mask" user)
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(44 "Edge.Cuts" user)
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)
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(setup
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(stackup
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(layer (name "F.Cu") (type "copper") (thickness 0.035))
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(layer (name "dielectric 1") (type "prepreg") (thickness 0.25)
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(material "FR4") (epsilon_r 4.5) (loss_tangent 0.02))
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(layer (name "B.Cu") (type "copper") (thickness 0.035))
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)
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(pad_to_mask_clearance 0.05)
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(soldermask_min_width 0.1)
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)
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(net 0 "")
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(net 1 "GND")
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(net 2 "+5V")
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(net 3 "+3.3V")
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(net 4 "I2S_BCLK")
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(net 5 "I2S_LRCLK")
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(net 6 "I2S_DIN")
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(net 7 "I2S_DOUT")
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(net 8 "AUDIO_IN")
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(net 9 "AUDIO_OUT")
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(net 10 "PREAMP_OUT")
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(net 11 "GATE_SW")
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;; Board outline — 65x56mm (standard 1590B footprint)
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(gr_rect (start -0.5 -0.5) (end 65 56) (layer "Edge.Cuts") (width 0.15) (fill none))
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;; Mounting holes — 4x 3.2mm at corners
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(module "MountingHole_3.2mm" (at 3.175 3.175 0)
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(layer "F.Cu") (uuid "mh-1")
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(fp_text reference "MH1" (at 3.175 3.175) (layer "F.SilkS")
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(effects (font (size 1 1) (thickness 0.15))))
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(pad "" np_thru_hole circle (at 0 0) (size 3.2 3.2) (layers *.Cu *.Mask))
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)
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(module "MountingHole_3.2mm" (at 61.825 3.175 0)
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(layer "F.Cu") (uuid "mh-2")
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(fp_text reference "MH2" (at 61.825 3.175) (layer "F.SilkS")
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(effects (font (size 1 1) (thickness 0.15))))
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(pad "" np_thru_hole circle (at 0 0) (size 3.2 3.2) (layers *.Cu *.Mask))
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)
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(module "MountingHole_3.2mm" (at 3.175 52.825 0)
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(layer "F.Cu") (uuid "mh-3")
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(fp_text reference "MH3" (at 3.175 52.825) (layer "F.SilkS")
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(effects (font (size 1 1) (thickness 0.15))))
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(pad "" np_thru_hole circle (at 0 0) (size 3.2 3.2) (layers *.Cu *.Mask))
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)
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(module "MountingHole_3.2mm" (at 61.825 52.825 0)
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(layer "F.Cu") (uuid "mh-4")
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(fp_text reference "MH4" (at 61.825 52.825) (layer "F.SilkS")
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(effects (font (size 1 1) (thickness 0.15))))
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(pad "" np_thru_hole circle (at 0 0) (size 3.2 3.2) (layers *.Cu *.Mask))
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)
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) |