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Add KiCad schematic and updated BOM

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Schematic includes:
- Power section: SS14 reverse protection, AMS1117-3.3 LDO
- RP2040-Zero and OLED module headers
- Trigger output: 74LVC1G17 Schmitt buffer
- Return input: voltage divider, BAT54 clamps, MCP6001 buffer
- Button with pull-up, power LED

BOM updated with correct parts and LCSC numbers.
ASCII schematic reference in hardware/kicad/README.md.
This commit is contained in:
Florian Berthold
2026-01-23 03:30:30 +01:00
parent d103b2732c
commit f100eb23bf
5 changed files with 694 additions and 13 deletions
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hardware/kicad/.gitkeep
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hardware/kicad/README.md
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# SN-L00 KiCad Project
## Schematic Overview
```
+12V (from Eurorack)
│
▼
┌─────────────────────────────────────────────────────────────────┐
│ POWER SECTION │
│ │
│ J1 (2x5) D1 (SS14) U1 (AMS1117-3.3) │
│ Eurorack ──────►Schottky──┬────►LDO────────────► +3.3V │
│ Header protection │ │ │
│ C1 C2,C3 │
│ 10uF 10uF+100nF │
│ │ │ │
│ GND GND │
└─────────────────────────────────────────────────────────────────┘
┌─────────────────────────────────────────────────────────────────┐
│ MCU & DISPLAY │
│ │
│ MOD1 (RP2040-Zero) MOD2 (OLED 128x32) │
│ ┌─────────────┐ ┌──────────┐ │
│ │ 3V3 5V │ │ GND │ │
│ │ GND GND │ │ VCC │◄── +3.3V │
│ │ GP0 GP9 │──SDA───────────►│ SDA │ │
│ │ GP1 GP8 │──SCL───────────►│ SCL │ │
│ │ GP2 GP7 │──TRIG_OUT └──────────┘ │
│ │ GP3 GP6 │──RETURN_IN │
│ │ GP4 GP5 │──BTN │
│ │ GP29 3V3 │ │
│ │ GND GND │ │
│ └─────────────┘ │
└─────────────────────────────────────────────────────────────────┘
┌─────────────────────────────────────────────────────────────────┐
│ TRIGGER OUTPUT │
│ │
│ GP2 ────► U2 (74LVC1G17) ────► R3 (100Ω) ────► J2 (TRIG OUT) │
│ Schmitt buffer current limit 3.5mm jack │
│ │ │
│ C4 (100nF) to GND │
└─────────────────────────────────────────────────────────────────┘
┌─────────────────────────────────────────────────────────────────┐
│ RETURN INPUT │
│ │
│ J3 (RETURN) ──► R4 (10K) ──┬──► R5/R6 divider ──► U3 ──► GP3 │
│ 3.5mm jack protection │ (10K/22K = 0.69x) MCP6001 │
│ │ buffer │
│ ├── D3 to +3.3V (clamp high) │
│ └── D4 to GND (clamp low) │
│ BAT54 Schottky │
└─────────────────────────────────────────────────────────────────┘
┌─────────────────────────────────────────────────────────────────┐
│ BUTTON │
│ │
│ +3.3V ──► R1 (10K) ──┬──► GP4 │
│ pull-up │ │
│ SW1 ──► GND │
│ tactile │
└─────────────────────────────────────────────────────────────────┘
┌─────────────────────────────────────────────────────────────────┐
│ POWER LED │
│ │
│ +3.3V ──► R2 (1K) ──► D2 (Green LED) ──► GND │
└─────────────────────────────────────────────────────────────────┘
```
## RP2040-Zero Pinout Reference
```
┌─────────────────┐
5V ──┤ 5V 3V3 ├── 3.3V
GND ──┤ GND GND ├── GND
GP29 ──┤ GP29 GP0 ├── I2C SDA → OLED
GP28 ──┤ GP28 GP1 ├── I2C SCL → OLED
GP27 ──┤ GP27 GP2 ├── TRIG_OUT → 74LVC1G17
GP26 ──┤ GP26 GP3 ├── RETURN_IN ← MCP6001
GP15 ──┤ GP15 GP4 ├── BTN (active low)
GP14 ──┤ GP14 GP5 ├── (spare)
└─────────────────┘
USB-C on bottom
```
## Files
- `SN-L00.kicad_pro` - KiCad project file
- `SN-L00.kicad_sch` - Schematic (open in KiCad 8+)
- `SN-L00.kicad_pcb` - PCB layout (to be created)
## Design Notes
### Power
- Single +12V rail used (no -12V needed)
- AMS1117-3.3 LDO provides 3.3V for MCU and peripherals
- SS14 Schottky for reverse polarity protection
- Total current draw ~20-30mA
### Trigger Output
- 74LVC1G17 provides clean Schmitt-trigger buffered output
- 100Ω series resistor for short-circuit protection
- Output: 0-3.3V (compatible with most Eurorack gate inputs)
### Return Input
- Handles 0-10V Eurorack signals safely
- 10K/22K voltage divider scales to ~0-3.1V
- Schottky clamp diodes protect against overvoltage
- MCP6001 rail-to-rail op-amp buffers signal
- Threshold set in firmware (~1.5V default)
### I2C
- 400kHz I2C to OLED display
- No external pull-ups needed (internal to OLED module)
## Opening the Project
1. Install KiCad 8.0+
2. Open `SN-L00.kicad_pro`
3. Schematic editor opens automatically
hardware/kicad/SN-L00.kicad_pro
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{
"board": {
"3dviewports": [],
"design_settings": {
"defaults": {
"board_outline_line_width": 0.1,
"copper_line_width": 0.2,
"copper_text_size_h": 1.5,
"copper_text_size_v": 1.5,
"copper_text_thickness": 0.3,
"other_line_width": 0.15,
"silk_line_width": 0.15,
"silk_text_size_h": 1.0,
"silk_text_size_v": 1.0,
"silk_text_thickness": 0.15
},
"diff_pair_dimensions": [],
"drc_exclusions": [],
"rules": {
"min_clearance": 0.2,
"min_track_width": 0.2,
"min_via_annular_width": 0.15,
"min_via_diameter": 0.5
},
"track_widths": [
0.2,
0.3,
0.5,
0.8
],
"via_dimensions": [
{
"diameter": 0.6,
"drill": 0.3
}
]
},
"layer_presets": [],
"viewports": []
},
"libraries": {
"pinned_footprint_libs": [],
"pinned_symbol_libs": []
},
"meta": {
"filename": "SN-L00.kicad_pro",
"version": 1
},
"net_settings": {
"classes": [
{
"clearance": 0.2,
"diff_pair_gap": 0.25,
"diff_pair_via_gap": 0.25,
"diff_pair_width": 0.2,
"name": "Default",
"track_width": 0.2,
"via_diameter": 0.6,
"via_drill": 0.3
},
{
"clearance": 0.3,
"name": "Power",
"track_width": 0.5,
"via_diameter": 0.8,
"via_drill": 0.4
}
]
},
"pcbnew": {
"last_paths": {
"gencad": "",
"idf": "",
"netlist": "",
"specctra_dsn": "",
"step": ""
},
"page_layout_descr_file": ""
},
"schematic": {
"annotate_start_num": 1,
"drawing": {
"default_line_thickness": 6.0,
"default_text_size": 50.0,
"field_names": [],
"intersheets_ref_own_page": false,
"intersheets_ref_prefix": "",
"intersheets_ref_short": false,
"intersheets_ref_show": false,
"intersheets_ref_suffix": "",
"junction_size_choice": 3,
"label_size_ratio": 0.25,
"pin_symbol_size": 0.0,
"text_offset_ratio": 0.08
},
"page_layout_descr_file": "",
"plot_directory": "",
"spice_external_command": "spice \"%I\"",
"subpart_first_id": 65,
"subpart_id_separator": 0
},
"sheets": [],
"text_variables": {}
}
hardware/kicad/SN-L00.kicad_sch
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(kicad_sch
(version 20231120)
(generator "eeschema")
(generator_version "8.0")
(uuid "a0e1b2c3-d4e5-f6a7-b8c9-d0e1f2a3b4c5")
(paper "A4")
(title_block
(title "SN-L00 Latency Tester")
(date "2026-01-23")
(rev "0.1")
(company "SubModular / Sub-Net e.U.")
)
;; Power symbols
(symbol
(lib_id "power:+12V")
(at 25.4 25.4 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "pwr-12v-1")
(property "Reference" "#PWR01" (at 25.4 29.21 0) (effects (font (size 1.27 1.27)) hide))
(property "Value" "+12V" (at 25.4 22.86 0) (effects (font (size 1.27 1.27))))
)
(symbol
(lib_id "power:GND")
(at 25.4 76.2 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "pwr-gnd-1")
(property "Reference" "#PWR02" (at 25.4 82.55 0) (effects (font (size 1.27 1.27)) hide))
(property "Value" "GND" (at 25.4 80.01 0) (effects (font (size 1.27 1.27))))
)
(symbol
(lib_id "power:+3.3V")
(at 63.5 25.4 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "pwr-3v3-1")
(property "Reference" "#PWR03" (at 63.5 29.21 0) (effects (font (size 1.27 1.27)) hide))
(property "Value" "+3.3V" (at 63.5 22.86 0) (effects (font (size 1.27 1.27))))
)
;; Eurorack Power Header J1
(symbol
(lib_id "Connector_Generic:Conn_02x05_Odd_Even")
(at 25.4 50.8 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "j1-euro-pwr")
(property "Reference" "J1" (at 25.4 40.64 0) (effects (font (size 1.27 1.27))))
(property "Value" "Eurorack_Power" (at 25.4 60.96 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical" (at 25.4 50.8 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C429954" (at 25.4 50.8 0) (effects (font (size 1.27 1.27)) hide))
)
;; Schottky Diode D1 - Reverse polarity protection
(symbol
(lib_id "Device:D_Schottky")
(at 38.1 30.48 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "d1-schottky")
(property "Reference" "D1" (at 38.1 27.94 0) (effects (font (size 1.27 1.27))))
(property "Value" "SS14" (at 38.1 33.02 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Diode_SMD:D_SMA" (at 38.1 30.48 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C2480" (at 38.1 30.48 0) (effects (font (size 1.27 1.27)) hide))
)
;; LDO Regulator U1
(symbol
(lib_id "Regulator_Linear:AMS1117-3.3")
(at 50.8 30.48 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "u1-ldo")
(property "Reference" "U1" (at 50.8 22.86 0) (effects (font (size 1.27 1.27))))
(property "Value" "AMS1117-3.3" (at 50.8 25.4 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Package_TO_SOT_SMD:SOT-223-3_TabPin2" (at 50.8 30.48 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C6186" (at 50.8 30.48 0) (effects (font (size 1.27 1.27)) hide))
)
;; Input capacitors
(symbol
(lib_id "Device:C")
(at 43.18 38.1 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "c1-input")
(property "Reference" "C1" (at 45.72 36.83 0) (effects (font (size 1.27 1.27))))
(property "Value" "10uF" (at 45.72 39.37 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Capacitor_SMD:C_0805_2012Metric" (at 43.18 38.1 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C15850" (at 43.18 38.1 0) (effects (font (size 1.27 1.27)) hide))
)
;; Output capacitors
(symbol
(lib_id "Device:C")
(at 58.42 38.1 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "c2-output")
(property "Reference" "C2" (at 60.96 36.83 0) (effects (font (size 1.27 1.27))))
(property "Value" "10uF" (at 60.96 39.37 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Capacitor_SMD:C_0805_2012Metric" (at 58.42 38.1 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C15850" (at 58.42 38.1 0) (effects (font (size 1.27 1.27)) hide))
)
(symbol
(lib_id "Device:C")
(at 63.5 38.1 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "c3-output")
(property "Reference" "C3" (at 66.04 36.83 0) (effects (font (size 1.27 1.27))))
(property "Value" "100nF" (at 66.04 39.37 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Capacitor_SMD:C_0603_1608Metric" (at 63.5 38.1 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C14663" (at 63.5 38.1 0) (effects (font (size 1.27 1.27)) hide))
)
;; RP2040-Zero Module MOD1
(symbol
(lib_id "Connector_Generic:Conn_01x09")
(at 101.6 50.8 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "mod1-rp2040-left")
(property "Reference" "MOD1A" (at 101.6 35.56 0) (effects (font (size 1.27 1.27))))
(property "Value" "RP2040-Zero_Left" (at 101.6 68.58 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Connector_PinHeader_2.54mm:PinHeader_1x09_P2.54mm_Vertical" (at 101.6 50.8 0) (effects (font (size 1.27 1.27)) hide))
)
(symbol
(lib_id "Connector_Generic:Conn_01x09")
(at 116.84 50.8 180)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "mod1-rp2040-right")
(property "Reference" "MOD1B" (at 116.84 35.56 0) (effects (font (size 1.27 1.27))))
(property "Value" "RP2040-Zero_Right" (at 116.84 68.58 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Connector_PinHeader_2.54mm:PinHeader_1x09_P2.54mm_Vertical" (at 116.84 50.8 0) (effects (font (size 1.27 1.27)) hide))
)
;; OLED Module MOD2
(symbol
(lib_id "Connector_Generic:Conn_01x04")
(at 139.7 50.8 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "mod2-oled")
(property "Reference" "MOD2" (at 139.7 43.18 0) (effects (font (size 1.27 1.27))))
(property "Value" "OLED_SSD1306" (at 139.7 60.96 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical" (at 139.7 50.8 0) (effects (font (size 1.27 1.27)) hide))
)
;; 74LVC1G17 Schmitt Trigger Buffer U2
(symbol
(lib_id "74xx_IEEE:74LVC1G17")
(at 152.4 101.6 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "u2-schmitt")
(property "Reference" "U2" (at 152.4 93.98 0) (effects (font (size 1.27 1.27))))
(property "Value" "74LVC1G17" (at 152.4 96.52 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Package_TO_SOT_SMD:SOT-23-5" (at 152.4 101.6 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C388628" (at 152.4 101.6 0) (effects (font (size 1.27 1.27)) hide))
)
;; MCP6001 Op-Amp U3
(symbol
(lib_id "Amplifier_Operational:MCP6001-OT")
(at 152.4 139.7 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "u3-opamp")
(property "Reference" "U3" (at 152.4 129.54 0) (effects (font (size 1.27 1.27))))
(property "Value" "MCP6001" (at 152.4 132.08 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Package_TO_SOT_SMD:SOT-23-5" (at 152.4 139.7 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C93025" (at 152.4 139.7 0) (effects (font (size 1.27 1.27)) hide))
)
;; Trigger Output Jack J2
(symbol
(lib_id "Connector:AudioJack2_Ground_Switch")
(at 177.8 101.6 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "j2-trig-out")
(property "Reference" "J2" (at 177.8 93.98 0) (effects (font (size 1.27 1.27))))
(property "Value" "TRIG_OUT" (at 177.8 109.22 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles" (at 177.8 101.6 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C2935955" (at 177.8 101.6 0) (effects (font (size 1.27 1.27)) hide))
)
;; Return Input Jack J3
(symbol
(lib_id "Connector:AudioJack2_Ground_Switch")
(at 177.8 139.7 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "j3-return-in")
(property "Reference" "J3" (at 177.8 132.08 0) (effects (font (size 1.27 1.27))))
(property "Value" "RETURN_IN" (at 177.8 147.32 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles" (at 177.8 139.7 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C2935955" (at 177.8 139.7 0) (effects (font (size 1.27 1.27)) hide))
)
;; Tactile Button SW1
(symbol
(lib_id "Switch:SW_Push")
(at 101.6 101.6 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "sw1-button")
(property "Reference" "SW1" (at 101.6 93.98 0) (effects (font (size 1.27 1.27))))
(property "Value" "BTN" (at 101.6 96.52 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Button_Switch_SMD:SW_Push_1P1T_NO_6x6mm_H9.5mm" (at 101.6 101.6 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C127509" (at 101.6 101.6 0) (effects (font (size 1.27 1.27)) hide))
)
;; Pull-up resistor for button
(symbol
(lib_id "Device:R")
(at 88.9 93.98 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "r1-pullup")
(property "Reference" "R1" (at 91.44 92.71 0) (effects (font (size 1.27 1.27))))
(property "Value" "10K" (at 91.44 95.25 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Resistor_SMD:R_0603_1608Metric" (at 88.9 93.98 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C25804" (at 88.9 93.98 0) (effects (font (size 1.27 1.27)) hide))
)
;; Power LED D2
(symbol
(lib_id "Device:LED")
(at 76.2 55.88 90)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "d2-led")
(property "Reference" "D2" (at 80.01 54.61 0) (effects (font (size 1.27 1.27))))
(property "Value" "PWR_LED" (at 80.01 57.15 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "LED_SMD:LED_0603_1608Metric" (at 76.2 55.88 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C72043" (at 76.2 55.88 0) (effects (font (size 1.27 1.27)) hide))
)
;; LED current limiting resistor
(symbol
(lib_id "Device:R")
(at 76.2 45.72 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "r2-led")
(property "Reference" "R2" (at 78.74 44.45 0) (effects (font (size 1.27 1.27))))
(property "Value" "1K" (at 78.74 46.99 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Resistor_SMD:R_0603_1608Metric" (at 76.2 45.72 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C21190" (at 76.2 45.72 0) (effects (font (size 1.27 1.27)) hide))
)
;; Series resistor for trigger output
(symbol
(lib_id "Device:R")
(at 165.1 101.6 90)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "r3-trig")
(property "Reference" "R3" (at 165.1 99.06 0) (effects (font (size 1.27 1.27))))
(property "Value" "100R" (at 165.1 104.14 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Resistor_SMD:R_0603_1608Metric" (at 165.1 101.6 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C22775" (at 165.1 101.6 0) (effects (font (size 1.27 1.27)) hide))
)
;; Input protection resistor
(symbol
(lib_id "Device:R")
(at 127 139.7 90)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "r4-input")
(property "Reference" "R4" (at 127 137.16 0) (effects (font (size 1.27 1.27))))
(property "Value" "10K" (at 127 142.24 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Resistor_SMD:R_0603_1608Metric" (at 127 139.7 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C25804" (at 127 139.7 0) (effects (font (size 1.27 1.27)) hide))
)
;; Voltage divider resistors for input (5V to 3.3V)
(symbol
(lib_id "Device:R")
(at 134.62 132.08 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "r5-divider-top")
(property "Reference" "R5" (at 137.16 130.81 0) (effects (font (size 1.27 1.27))))
(property "Value" "10K" (at 137.16 133.35 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Resistor_SMD:R_0603_1608Metric" (at 134.62 132.08 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C25804" (at 134.62 132.08 0) (effects (font (size 1.27 1.27)) hide))
)
(symbol
(lib_id "Device:R")
(at 134.62 149.86 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "r6-divider-bot")
(property "Reference" "R6" (at 137.16 148.59 0) (effects (font (size 1.27 1.27))))
(property "Value" "22K" (at 137.16 151.13 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Resistor_SMD:R_0603_1608Metric" (at 134.62 149.86 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C25774" (at 134.62 149.86 0) (effects (font (size 1.27 1.27)) hide))
)
;; Input protection diodes
(symbol
(lib_id "Device:D_Schottky")
(at 139.7 124.46 90)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "d3-clamp-high")
(property "Reference" "D3" (at 143.51 123.19 0) (effects (font (size 1.27 1.27))))
(property "Value" "BAT54" (at 143.51 125.73 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Diode_SMD:D_SOD-323" (at 139.7 124.46 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C181104" (at 139.7 124.46 0) (effects (font (size 1.27 1.27)) hide))
)
(symbol
(lib_id "Device:D_Schottky")
(at 139.7 157.48 90)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "d4-clamp-low")
(property "Reference" "D4" (at 143.51 156.21 0) (effects (font (size 1.27 1.27))))
(property "Value" "BAT54" (at 143.51 158.75 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Diode_SMD:D_SOD-323" (at 139.7 157.48 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C181104" (at 139.7 157.48 0) (effects (font (size 1.27 1.27)) hide))
)
;; Decoupling caps for ICs
(symbol
(lib_id "Device:C")
(at 152.4 88.9 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "c4-u2-decoup")
(property "Reference" "C4" (at 154.94 87.63 0) (effects (font (size 1.27 1.27))))
(property "Value" "100nF" (at 154.94 90.17 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Capacitor_SMD:C_0603_1608Metric" (at 152.4 88.9 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C14663" (at 152.4 88.9 0) (effects (font (size 1.27 1.27)) hide))
)
(symbol
(lib_id "Device:C")
(at 152.4 152.4 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "c5-u3-decoup")
(property "Reference" "C5" (at 154.94 151.13 0) (effects (font (size 1.27 1.27))))
(property "Value" "100nF" (at 154.94 153.67 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Capacitor_SMD:C_0603_1608Metric" (at 152.4 152.4 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C14663" (at 152.4 152.4 0) (effects (font (size 1.27 1.27)) hide))
)
;; Text annotations
(text "POWER SECTION" (at 40.64 15.24 0) (effects (font (size 2.54 2.54))))
(text "MCU & DISPLAY" (at 114.3 25.4 0) (effects (font (size 2.54 2.54))))
(text "TRIGGER OUTPUT" (at 152.4 78.74 0) (effects (font (size 2.54 2.54))))
(text "RETURN INPUT" (at 152.4 116.84 0) (effects (font (size 2.54 2.54))))
(text "BUTTON" (at 101.6 78.74 0) (effects (font (size 2.54 2.54))))
;; Net labels
(label "TRIG_OUT_MCU" (at 134.62 101.6 0) (effects (font (size 1.27 1.27))))
(label "RETURN_IN_MCU" (at 170.18 139.7 180) (effects (font (size 1.27 1.27))))
(label "BTN" (at 109.22 101.6 0) (effects (font (size 1.27 1.27))))
(label "SDA" (at 132.08 48.26 0) (effects (font (size 1.27 1.27))))
(label "SCL" (at 132.08 50.8 0) (effects (font (size 1.27 1.27))))
)