Rev A — spec handoff + Objective 1 sourcing

flux

Final BOM completion is done with zero missing-MPN rows. J3 and BZ1 remain on PCB and are excluded from PCBA placement.
No Basic-class exact match was available for 1.78 kΩ, 3.01 kΩ, 90.9 kΩ, 3.48 kΩ, 178 kΩ, and 10 µF; Extended parts were assigned. Note: C14’s sourcing metadata is 0603, while its existing physical footprint remains 0805 because layout changes were prohibited.

  • sentry-node-v1-bom-jlcpcb.csv

    CommentDesignatorFootprintJLCPCB Part #LCSC Part #
    TMB12A03BZ1Through Hole D12mm P7.6mmC96222
    CL10A475KP8NNNCC1, C2, C3C1705
    GRM188R61A226ME15LC6, C7, C8C0603C167429
    CL10B104KB8NNNCC10, C11, C15, C16, C18, C20, C22, C25C_0603_1608MetricC1591
    CL10A106KP8NNNCC12, C4, C5, C9C19702
    CL10A105KB8NNNCC13, C17, C19, C21, C23C_0603_1608MetricC15849
    MMASL168BB5106MTNA01C14C_0603_1608MetricC6594205
    6SVPC330MC24CAP-SMD_BD6.3-L6.6-W6.6-FDC139569
    OCV101M0JTR-0606C26CAP-SMD_BD6.3-L6.6-W6.6-LS7.2-R-RDC134854
    USBLC6-2SC6D1C7519
    1N4148W-13-FD2, D3SOD-123_L2.7-W1.6-LS3.7-RDC112342
    BLM18AG601SN1DFB1C19330
    TYPE-C-31-M-12J1USB-C_SMD-TYPE-C-31-M-12C165948
    B2B-PH-SM4-TB(LF)(SN)J2CONN-SMD_B2B-PH-SM4-TB-LF-SNC160352
    XFL4020-152MECL1C3033018
    WS2812B-V6LED1SMD5050-4PC52917433
    ICS-43434M1, M2, M3, M4LGA-6 3.5x2.65mm bottom-portC5656610
    MMBT2222ALT1GQ1, Q2SOT-23C82460
    0603WAF5101T5ER1, R2R_0603_1608MetricC23186
    ERJ3EKF1781VR3R_0603_1608MetricC403029
    RC0603FR-073K01LR4R_0603_1608MetricC137732
    RC0603FR-0790K9LR5R_0603_1608MetricC185305
    CL0603FN3K48PR7R_0603_1608MetricC52209912
    ERJ-U03F1783VR10R_0603_1608MetricC1859202
    0603WAF1004T5ER11, R9R_0603_1608MetricC22935
    0603WAF1003T5ER12, R13, R8R_0603_1608MetricC25803
    0603WAF1002T5ER14, R6R_0603_1608MetricC25804
    0603WAF1001T5ER15, R16R_0603_1608MetricC21190
    0603WAF3300T5ER17R_0603_1608MetricC23138
    MK-12C02-G015S1SW-SMD_G-SWITCH_MK-12C02-G015C2911519
    K2-1114SA-A4SW-06SW2, SW3KEY-SMD_4P-L4.8-W4.6-P1.70-LS6.2C136662
    TS-1187A-B-A-BSW4SW-SMD_4P-L5.1-W5.1-P3.70-LS6.5-TL-2C318884
    BQ24074RGTRU1
    TPS63020DSJRU2C15483
    ESP32-S3-WROOM-1-N16R8U3WIRELM-SMD_ESP32-S3-WROOM-1C2913202
    Ra-01HU4WIRELM-SMD_RA-01HC503593

  • sentry-node-v1-pickplace-jlcpcb-corrected.csv

    DesignatorLayerRotationMid XMid Y
    C1Bottom028mm-4.5mm
    C2Bottom028mm-7.5mm
    C3Bottom036mm-6mm
    C4Bottom0-4mm4.7mm
    C5Bottom0-4mm-4.7mm
    C6Bottom03.8mm4.7mm
    C7Bottom03.8mm-4.7mm
    C8Bottom00.8mm-4.7mm
    C9Bottom0-18.5mm12mm
    C10Bottom0-4.8mm3.3mm
    C11Bottom034mm-1mm
    C12Bottom0-0.8mm4.7mm
    C13Bottom0-30.1mm10.4mm
    C14Bottom0-35.3mm10.4mm
    C15Bottom0-32.6mm10.4mm
    C16Bottom0-30.5mm-26.2mm
    C17Bottom0-30.5mm-29.8mm
    C18Bottom9030.5mm29.8mm
    C19Bottom030.5mm26.2mm
    C20Bottom90-30.5mm30mm
    C21Bottom0-25.5mm30mm
    C22Bottom9025.5mm-24.59mm
    C23Bottom9030.5mm-24.59mm
    C24Top0-13mm-27mm
    C25Top0-20mm0mm
    C26Top09mm22.5mm
    D1Bottom01mm-28mm
    D2Top0-22mm18mm
    D3Top0-31mm-6mm
    FB1Bottom0-14mm12mm
    J1Bottom00mm-36.9mm
    J2Bottom27037.44mm-25mm
    L1Bottom03.8mm0mm
    LED1Top00mm24mm
    M1Bottom0-28.327mm-28mm
    M2Bottom027.673mm28mm
    M3Bottom0-28.327mm28mm
    M4Bottom027.673mm-28mm
    Q1Top0-10mm18mm
    Q2Top0-31mm-12mm
    R1Bottom0-7mm-32mm
    R2Bottom0-7mm-35mm
    R3Bottom026mm-10mm
    R4Bottom029mm-10mm
    R5Bottom032mm-10mm
    R6Bottom035mm-10mm
    R7Bottom026mm-13mm
    R8Bottom029mm-13mm
    R9Bottom00mm-3.4mm
    R10Bottom04.8mm3mm
    R11Bottom09mm-8mm
    R12Bottom037mm-1mm
    R13Bottom034mm-3.5mm
    R14Bottom0-32.5mm11.6mm
    R15Top0-14mm15mm
    R16Top0-27mm-12mm
    R17Top029mm8mm
    S1Top18022.0254mm40.0435mm
    SW2Top0-11mm37mm
    SW3Top0-20mm37mm
    SW4Top00mm-26mm
    U1Bottom032mm-6mm
    U2Bottom0-2mm0mm
    U3Bottom270-32.87mm0mm
    U4Top18030.5mm-8mm
Details: Final BOM Completion Report. ORDER HELD — no order placed.
A

agamrossen

tell me exactly out of the display header pins which one is meant for which pin on the 1.54 inch waveshare e ink display

flux

The J3 display header is wired in the standard Waveshare 1.54-inch e-paper cable order:

Table

J3 pinBoard netWaveshare display pin
13V3_SYSVCC
2GNDGND
3SPI2_MOSIDIN
4SPI2_SCKCLK
5EPD_CSCS
6EPD_DCDC
7EPD_RSTRST
8EPD_BUSYBUSY
So the connection is 1→VCC, 2→GND, 3→DIN, 4→CLK, 5→CS, 6→DC, 7→RST, 8→BUSY.
This assumes pin 1 is identified from the PCB footprint’s pin-1 marker. Do not determine pin 1 solely by viewing the header from the cable side, because the apparent order reverses when viewed from the opposite face.
Verify display connector
Create firmware pin map
Review display power
Create bring-up checklist
Sign up to send

Files

Schematic

Layout

3D View

H4
H1
U3
M2
End of Life
BZ1
M3
End of Life
LED1
M1
End of Life
Q2
H2
H3
M4
End of Life
Q1
D1
SW4
D3
D2
L1
Inductance
1.5µH
FB1
R5
Resistance
90.9kΩ
C11
Capacitance
100nF
R11
Resistance
1MΩ
C25
Capacitance
100nF
C15
Capacitance
100nF
C19
Capacitance
1uF
R12
Resistance
100kΩ
R6
Resistance
10kΩ
R8
Resistance
100kΩ
R4
Resistance
3.01kΩ
C27
Capacitance
100nF
R3
Resistance
1.78kΩ
C13
Capacitance
1uF
C21
Capacitance
1uF
R1
Resistance
5.1kΩ
C20
Capacitance
100nF
R2
Resistance
5.1kΩ
C23
Capacitance
1uF
R9
Resistance
1MΩ
R13
Resistance
100kΩ
C18
Capacitance
100nF
R17
Resistance
330Ω
C14
Capacitance
10uF
C10
Capacitance
100nF
R15
Resistance
1kΩ
R16
Resistance
1kΩ
C17
Capacitance
1uF
R14
Resistance
10kΩ
R10
Resistance
178kΩ
C22
Capacitance
100nF
C16
Capacitance
100nF
R7
Resistance
3.48kΩ
SW3
ANT1
C24
Capacitance
330uF
C2
Capacitance
4.7µF
TP2
TP15
TP5
TP3
TP16
TP14
C1
Capacitance
4.7µF
TP17
TP6
TP12
TP9
TP7
TP13
C3
Capacitance
4.7µF
SW2
TP10
TP4
TP1
TP8
MP2
MP1
TP11
J2
J3
C4
Capacitance
10µF
U4
C5
Capacitance
10µF
C9
Capacitance
10µF
C12
Capacitance
10µF
U1
J1
C26
U2
C8
C7
S1
C6
Owner Change Set Completion
Scope status

Table

ItemStatusResult
Exact LSM6DS3TR-C sourcing and useCompletedExact MPN used; no substitute.
All-DNP IMU schematic blockCompletedU5, C28, R18, R19, TP17 added, wired and PCB-included.
Microphone X-configurationCompletedAll four mic centres set to the owner coordinates on Bottom; dedicated capacitor pairs moved with each mic.
UI/RF/mechanical owner overridesCompletedJ3, LED1, SW4, J1, U4/ANT1, U3 and mounting holes repositioned; local support groups moved only where needed to remove collisions.
Affected route cleanupCompletedI2S route deletion was requested for all four affected nets; no existing I2S copper was present, so 0 segments were removed. Final dangling-trace count is 0.
Full-board routingUnattempted by scope154 airwires remain, as expected before routing.
IMU sourcing evidence
  • Exact device: STMicroelectronics LSM6DS3TR-C.
  • LCSC part number: C967633.
  • LCSC page: https://www.lcsc.com/product-detail/C967633.html
  • Stock evidence retrieved on 2026-08-14: 7,000 units in stock, ships now.
  • Package: LGA-14 (2.5 × 3.0 mm).
  • ST product status: Active / volume production.
  • Flux library searches by exact MPN and agentic functional search found no existing usable library part. An exact datasheet-backed part was therefore created and published without substitution: /agamrossen/lsm6ds3tr-c
  • The created part was verified as 14 terminals and 14 distinct non-overlapping LGA pads using the ST pin table and the official KiCad LGA-14_3x2.5mm_P0.5mm_LayoutBorder3x4y land pattern.
Added DNP designators and assembly handling

Table

DesignatorPart/valueAssembly statePCB state
U5LSM6DS3TR-C, C967633Exclude from BOM = true; Exclude from Pick & Place = trueIncluded; footprint present
C28100 nF, 10 V, 0603Exclude from BOM = true; Exclude from Pick & Place = trueIncluded; footprint present
R184.7 kΩ, 1%, 0603Exclude from BOM = true; Exclude from Pick & Place = trueIncluded; footprint present
R194.7 kΩ, 1%, 0603Exclude from BOM = true; Exclude from Pick & Place = trueIncluded; footprint present
TP17IMU INT1 test pointExclude from BOM = true; Exclude from Pick & Place = trueIncluded; Bottom footprint present
No added item has Exclude from PCB set.
IMU wiring
  • U5:SDA → GPIO38 → U3:IO38, existing TP12, and R18:P1.
  • U5:SCL → GPIO39 → U3:IO39, existing TP13, and R19:P1.
  • R18:P2, R19:P2 → 3V3_SYS.
  • U5:VDD, U5:VDDIO, U5:CS → 3V3_SYS.
  • C28:P1 → 3V3_SYS; C28:P2 → GND.
  • U5:SDO/SA0 → GND, selecting I2C address 0x6A.
  • U5:SDx, U5:SCx, U5:GND pins 6 and 7 → GND.
  • U5:INT1 → dedicated net IMU_INT1 → TP17.
  • U5:INT2, NC10, NC11 are intentionally no-connect.
  • The owner-specified exactly one 100 nF capacitor was used across the common 3V3_SYS/GND supply; no second VDDIO capacitor was added.
Verified PCB placement
Microphones and dedicated decoupling
All microphones remain on Bottom.

Table

MicExact centre (mm)Data pair100 nF1 µF
M1(-21.21, -21.21)I2S_SD_AC16 (-23.71, -19.41)C17 (-23.71, -23.01)
M2(+21.21, +21.21)I2S_SD_AC18 (+23.71, +23.01)C19 (+23.71, +19.41)
M3(-21.21, +21.21)I2S_SD_BC20 (-23.71, +23.21)C21 (-18.71, +23.21)
M4(+21.21, -21.21)I2S_SD_BC22 (+18.71, -17.80)C23 (+23.71, -17.80)
The M4 capacitor pair was moved to the inner/upper side of M4 to clear the WROOM edge region while remaining local to M4.
Acoustic ports
Each microphone retained its component-owned centered acoustic feature:
  • NPTH drill: 0.900 mm.
  • Nominal no-copper ring geometry: 1.025 mm diameter.
  • Radial copper keepout: 0.0625 mm.
  • Port offset relative to each microphone footprint: (-0.710 mm, 0).
  • Connected layers: All for the NPTH.
UI, RF and mechanical

Table

ItemCentre / placementLayer / notes
J3(0, +24) mmTop, vertical; 21.35 mm length extends inward to y=+13.33 mm, adjacent to the board-centre area and clear of switcher copper.
LED1(-26, 0) mmTop, mid-left.
SW4(+26, 0) mmTop, mid-right.
J1 USB-C(0, -36.9) mmBottom; X-centred on the -Y edge. The placement tool clamped Y from -38.23 mm to the valid footprint/body position while preserving the centred connector exit.
U4 Ra-01H(-22, -30) mmTop; ANT pad faces the -Y-left corner.
ANT1(-32, -40) mmTop; external antenna solder exit with 3 mm keepout/min-keepout.
U3 WROOM(+18, -37.2) mm, 180°Bottom; antenna end intentionally overhangs the -Y-right edge.
H1(-34, +34) mmVerified 2.5 mm NPTH.
H2(+34, +34) mmVerified 2.5 mm NPTH.
H3(+34, -34) mmVerified 2.5 mm NPTH.
H4(-34, -34) mmVerified 2.5 mm NPTH.
The two RF exit regions are separated: LoRa is at the -Y-left corner and the WROOM antenna is at the -Y-right edge.
DNP IMU block PCB placement

Table

DesignatorCentre (mm)Layer
U5(12.0, 29.0)Top
C28(15.3, 29.2)Top
R18(9.5, 32.0)Top
R19(12.5, 32.0)Top
TP17(16.0, 32.0)Bottom
Route cleanup and validation evidence
  • Explicitly deleted PCB routing for: I2S_BCLK, I2S_WS, I2S_SD_A, I2S_SD_B.
  • Tool result: no routing existed on those nets, so 0 trace/via objects removed.
  • Final routing-state readback: 0 dangling traces.
  • No full-board route was run.
  • Final requested placement/copper checks returned no ERROR, WARNING or OPEN findings for component-body overlap, copper overlap, protected intrusions, edge placement, component outside board, or dangling traces.
  • Final single electrical/ERC retrieval returned no ERROR, WARNING or OPEN findings, including floating pins, no-connect handling, driver conflicts, shorted components, power pins, single-pin nets, undriven nets, pull-ups and decoupling.
  • Board setup remains 84 × 84 mm, R10 rounded rectangle, 4 copper layers.
Blockers and residuals
  • No blocker prevented completion.
  • The exact MPN was absent from the pre-existing Flux library, but it was sourceable and an exact verified part was successfully created; this was not treated as a substitution.
  • 154 airwires remain because the full board is intentionally not routed in this scope.
  • Public LCSC pages do not expose JLCPCB Basic/Extended assembly classification reliably; confirm classification in the JLCPCB BOM/parts interface before freezing the assembly BOM.

  • Scope status

  • IMU sourcing evidence

  • Added DNP designators and assembly handling

  • IMU wiring

  • Verified PCB placement

  • Microphones and dedicated decoupling

  • Acoustic ports

  • UI, RF and mechanical

  • DNP IMU block PCB placement

  • Route cleanup and validation evidence

  • Blockers and residuals