Rev A — spec handoff + Objective 1 sourcing

Thought for 41 sec

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

Comment	Designator	Footprint	JLCPCB Part #	LCSC Part #
TMB12A03	BZ1	Through Hole D12mm P7.6mm		C96222
CL10A475KP8NNNC	C1, C2, C3			C1705
GRM188R61A226ME15L	C6, C7, C8	C0603		C167429
CL10B104KB8NNNC	C10, C11, C15, C16, C18, C20, C22, C25	C_0603_1608Metric		C1591
CL10A106KP8NNNC	C12, C4, C5, C9			C19702
CL10A105KB8NNNC	C13, C17, C19, C21, C23	C_0603_1608Metric		C15849
MMASL168BB5106MTNA01	C14	C_0603_1608Metric		C6594205
6SVPC330M	C24	CAP-SMD_BD6.3-L6.6-W6.6-FD		C139569
OCV101M0JTR-0606	C26	CAP-SMD_BD6.3-L6.6-W6.6-LS7.2-R-RD		C134854
USBLC6-2SC6	D1			C7519
1N4148W-13-F	D2, D3	SOD-123_L2.7-W1.6-LS3.7-RD		C112342
BLM18AG601SN1D	FB1			C19330
TYPE-C-31-M-12	J1	USB-C_SMD-TYPE-C-31-M-12		C165948
B2B-PH-SM4-TB(LF)(SN)	J2	CONN-SMD_B2B-PH-SM4-TB-LF-SN		C160352
XFL4020-152MEC	L1			C3033018
WS2812B-V6	LED1	SMD5050-4P		C52917433
ICS-43434	M1, M2, M3, M4	LGA-6 3.5x2.65mm bottom-port		C5656610
MMBT2222ALT1G	Q1, Q2	SOT-23		C82460
0603WAF5101T5E	R1, R2	R_0603_1608Metric		C23186
ERJ3EKF1781V	R3	R_0603_1608Metric		C403029
RC0603FR-073K01L	R4	R_0603_1608Metric		C137732
RC0603FR-0790K9L	R5	R_0603_1608Metric		C185305
CL0603FN3K48P	R7	R_0603_1608Metric		C52209912
ERJ-U03F1783V	R10	R_0603_1608Metric		C1859202
0603WAF1004T5E	R11, R9	R_0603_1608Metric		C22935
0603WAF1003T5E	R12, R13, R8	R_0603_1608Metric		C25803
0603WAF1002T5E	R14, R6	R_0603_1608Metric		C25804
0603WAF1001T5E	R15, R16	R_0603_1608Metric		C21190
0603WAF3300T5E	R17	R_0603_1608Metric		C23138
MK-12C02-G015	S1	SW-SMD_G-SWITCH_MK-12C02-G015		C2911519
K2-1114SA-A4SW-06	SW2, SW3	KEY-SMD_4P-L4.8-W4.6-P1.70-LS6.2		C136662
TS-1187A-B-A-B	SW4	SW-SMD_4P-L5.1-W5.1-P3.70-LS6.5-TL-2		C318884
BQ24074RGTR	U1
TPS63020DSJR	U2		C15483
ESP32-S3-WROOM-1-N16R8	U3	WIRELM-SMD_ESP32-S3-WROOM-1		C2913202
Ra-01H	U4	WIRELM-SMD_RA-01H		C503593

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

Designator	Layer	Rotation	Mid X	Mid Y
C1	Bottom	0	28mm	-4.5mm
C2	Bottom	0	28mm	-7.5mm
C3	Bottom	0	36mm	-6mm
C4	Bottom	0	-4mm	4.7mm
C5	Bottom	0	-4mm	-4.7mm
C6	Bottom	0	3.8mm	4.7mm
C7	Bottom	0	3.8mm	-4.7mm
C8	Bottom	0	0.8mm	-4.7mm
C9	Bottom	0	-18.5mm	12mm
C10	Bottom	0	-4.8mm	3.3mm
C11	Bottom	0	34mm	-1mm
C12	Bottom	0	-0.8mm	4.7mm
C13	Bottom	0	-30.1mm	10.4mm
C14	Bottom	0	-35.3mm	10.4mm
C15	Bottom	0	-32.6mm	10.4mm
C16	Bottom	0	-30.5mm	-26.2mm
C17	Bottom	0	-30.5mm	-29.8mm
C18	Bottom	90	30.5mm	29.8mm
C19	Bottom	0	30.5mm	26.2mm
C20	Bottom	90	-30.5mm	30mm
C21	Bottom	0	-25.5mm	30mm
C22	Bottom	90	25.5mm	-24.59mm
C23	Bottom	90	30.5mm	-24.59mm
C24	Top	0	-13mm	-27mm
C25	Top	0	-20mm	0mm
C26	Top	0	9mm	22.5mm
D1	Bottom	0	1mm	-28mm
D2	Top	0	-22mm	18mm
D3	Top	0	-31mm	-6mm
FB1	Bottom	0	-14mm	12mm
J1	Bottom	0	0mm	-36.9mm
J2	Bottom	270	37.44mm	-25mm
L1	Bottom	0	3.8mm	0mm
LED1	Top	0	0mm	24mm
M1	Bottom	0	-28.327mm	-28mm
M2	Bottom	0	27.673mm	28mm
M3	Bottom	0	-28.327mm	28mm
M4	Bottom	0	27.673mm	-28mm
Q1	Top	0	-10mm	18mm
Q2	Top	0	-31mm	-12mm
R1	Bottom	0	-7mm	-32mm
R2	Bottom	0	-7mm	-35mm
R3	Bottom	0	26mm	-10mm
R4	Bottom	0	29mm	-10mm
R5	Bottom	0	32mm	-10mm
R6	Bottom	0	35mm	-10mm
R7	Bottom	0	26mm	-13mm
R8	Bottom	0	29mm	-13mm
R9	Bottom	0	0mm	-3.4mm
R10	Bottom	0	4.8mm	3mm
R11	Bottom	0	9mm	-8mm
R12	Bottom	0	37mm	-1mm
R13	Bottom	0	34mm	-3.5mm
R14	Bottom	0	-32.5mm	11.6mm
R15	Top	0	-14mm	15mm
R16	Top	0	-27mm	-12mm
R17	Top	0	29mm	8mm
S1	Top	180	22.0254mm	40.0435mm
SW2	Top	0	-11mm	37mm
SW3	Top	0	-20mm	37mm
SW4	Top	0	0mm	-26mm
U1	Bottom	0	32mm	-6mm
U2	Bottom	0	-2mm	0mm
U3	Bottom	270	-32.87mm	0mm
U4	Top	180	30.5mm	-8mm

Details: Final BOM Completion Report. ORDER HELD — no order placed.

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

Thought for 26 sec

flux

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

Table

J3 pin	Board net	Waveshare display pin
1	`3V3_SYS`	VCC
2	`GND`	GND
3	`SPI2_MOSI`	DIN
4	`SPI2_SCK`	CLK
5	`EPD_CS`	CS
6	`EPD_DC`	DC
7	`EPD_RST`	RST
8	`EPD_BUSY`	BUSY

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

Files

Schematic

Layout

3D View

End of Life

BZ1

End of Life

LED1

End of Life

FB1

C11

Capacitance

100nF

C25

Capacitance

100nF

C15

Capacitance

100nF

C19

Capacitance

1uF

C27

Capacitance

100nF

C13

Capacitance

1uF

C21

Capacitance

1uF

C20

Capacitance

100nF

C23

Capacitance

1uF

C18

Capacitance

100nF

C14

Capacitance

10uF

C10

Capacitance

100nF

C17

Capacitance

1uF

C22

Capacitance

100nF

C16

Capacitance

100nF

ANT1

TP2

TP15

TP5

TP3

TP16

TP14

TP17

TP6

TP12

TP9

TP7

TP13

TP10

TP4

TP1

TP8

MP2

MP1

TP11

Resistance

90.9kΩ

R11

Resistance

1MΩ

R12

Resistance

100kΩ

Resistance

10kΩ

Resistance

100kΩ

Resistance

3.01kΩ

Resistance

1.78kΩ

Resistance

5.1kΩ

Resistance

5.1kΩ

Resistance

1MΩ

R13

Resistance

100kΩ

R17

Resistance

330Ω

R15

Resistance

1kΩ

R16

Resistance

1kΩ

R14

Resistance

10kΩ

R10

Resistance

178kΩ

Resistance

3.48kΩ

SW3

C24

Capacitance

330uF

Capacitance

4.7µF

Capacitance

4.7µF

Capacitance

4.7µF

SW2

SW4

Capacitance

10µF

Capacitance

10µF

Capacitance

10µF

C12

Capacitance

10µF

C26

Inductance

1.5µH

Sourcing Feasibility Report

Objective: PCB specification §7.1 only.
Checked: 2026-08-13.
Pricing basis: USD unit price at the smallest displayed LCSC tier suitable for a five-board build; prices and inventory are snapshots and must be rechecked when the BOM is locked.
JLC class note: Public LCSC product pages do not consistently expose JLCPCB's Basic/Extended designation. Commodity passives below are identified as Basic candidate; all special-function ICs, modules, connectors, switches, microphones, and uncommon values should be budgeted as Extended until the JLC BOM tool confirms otherwise.

No schematic or PCB objects were created or modified.

Executive feasibility result

Owner approvals frozen after Objective 1

RGB LED: Worldsemi WS2812B-V6, LCSC C52917433, APPROVED and frozen. The 5050 package is accepted for use with a light pipe and its outdoor brightness is desirable. XL-1615 remains rejected; do not use the 2020 variant.
LoRa module: Ai-Thinker Ra-01H, LCSC C503593, APPROVED and frozen. Its 803–930 MHz coverage supports both intended bands. RFM95W-915S2 is fallback only.
Bare ICS-43434 passes the hard availability check:
A compliant 3.3 V WS2812-protocol LED exists and is stocked: Worldsemi WS2812B-V6, LCSC C52917433, datasheet VDD 3.3–5.3 V, 41,490 in stock, $0.1013 at 5+. Use of this 5050 package would require owner approval because §4.5's example points to the much smaller XL-1615 class.
Worldsemi WS2812B-2020-V6, LCSC C52917434, is also datasheet-rated 3.3–5.3 V, but was out of stock at check time ($0.091 at 5+ when available).
XINGLIGHT XL-1615RGBC-2812B, LCSC C5349954, is not compliant: its LCSC-listed supply is 4.5–5.5 V. The related XL-1615 datasheet is internally inconsistent and states a recommended/input range beginning at 3.5 V, so it cannot be treated as guaranteed at 3.3 V.
The frozen major ICs/modules are presently feasible: ESP32-S3-WROOM-1-N16R8, BQ24074RGTR, TPS63020DSJR, ICS-43434, and Ra-01H all have LCSC listings and current stock.

§4 sourcing matrix

Table

§	Function / specified item	Proposed exact MPN	LCSC	Stock / status	JLC class	Unit price	Feasibility / action
4.1	MCU module	ESP32-S3-WROOM-1-N16R8	C2913202	14,739	Extended	$5.1608 (1+)	Pass, exact frozen variant.
4.1	EN / reset pull-up, 10 kΩ	0603 1% 10 kΩ commodity	Select at BOM lock	Widely stocked	Basic candidate	typically < $0.002	Pass; exact vendor can be chosen without changing value/package intent.
4.1	EN capacitor, 1 µF	0603/0805 X7R ≥6.3 V	Select at BOM lock	Widely stocked	Basic candidate	typically $0.003–0.01	Pass.
4.1	RESET tactile	K2-1114SA-A4SW-06	C136662	Listed	Extended	recheck	Pass candidate; SMD 4.8 × 3.5 mm. Mechanical approval deferred to capture/layout.
4.1	BOOT tactile	K2-1114SA-A4SW-06	C136662	Listed	Extended	recheck	Same candidate as RESET.
4.1	Bulk decoupling, 10 µF	0805 X5R/X7R ≥6.3 V	Select at BOM lock	Widely stocked	Basic candidate	typically $0.01–0.03	Pass.
4.1	Local decoupling, 100 nF	0603 X7R ≥16 V	Select at BOM lock	Widely stocked	Basic candidate	typically < $0.003	Pass.
4.2	USB-C receptacle, USB2 UFP	TYPE-C-31-M-12	C165948	425,665	Extended	$0.1716 (5+)	Pass; common 16-pin SMD receptacle. Final mechanical choice remains frozen once captured.
4.2	CC pulldowns, 5.1 kΩ ×2	0603 1% 5.1 kΩ commodity	Select at BOM lock	Widely stocked	Basic candidate	typically < $0.002	Pass.
4.2	USB ESD array	USBLC6-2SC6 (ST)	C7519	28,370	Extended	$0.1832 (5+)	Pass, exact class named in spec.
4.3	Power-path charger	BQ24074RGTR	C54313	5,535	Extended	$2.0482 (1+)	Pass, exact class. NTC may be biased with fixed 10 kΩ when no cell NTC is used; final ISET/ILIM values belong to Objective 2 and are not selected here.
4.3	Battery connector	B2B-PH-SM4-TB(LF)(SN)	C160352	Listed	Extended	recheck	Pass SMD vertical JST-PH-2.0 candidate. Spec says JST may be hand-soldered; final orientation must be approved before capture.
4.3	Power slide switch	SS-12D00-G3	C22355741	Listed	Hand-solder / exclude PCBA	recheck	Pass as the named through-hole equivalent. No SMD substitution proposed.
4.3	3.3 V buck-boost	TPS63020DSJR	C15483	9,438	Extended	$0.9647 (1+)	Pass, ≥1 A class. Exact inductor/capacitor/feedback network must follow the selected fixed 3.3 V implementation in Objective 2.
4.3	Buck-boost inductor	1 µH shielded, TPS63020-current-rated	Select after datasheet calculation	Multiple candidates	Extended	typically $0.10–0.40	Feasible, but exact MPN cannot be responsibly frozen before Objective 2 current/ripple check. No circuitry change implied.
4.3	MIC_3V3 ferrite bead	0603 ferrite, current-rated, impedance TBD	Select after filter check	Widely stocked	Basic/Extended candidate	typically $0.01–0.05	Feasible; exact impedance/current rating is not specified in §4.
4.3/4.4	MIC_3V3 bulk, 10 µF	0805 X5R/X7R ≥6.3 V	Select at BOM lock	Widely stocked	Basic candidate	typically $0.01–0.03	Pass.
4.4	I2S MEMS microphone ×4	ICS-43434	C5656610	5,198	Extended	$3.8216 (1+), $3.3464 (10+)	Hard-check pass: bare LGA microphone is available. PCBA process note remains critical: bottom-side, final reflow, no wash.
4.4	Per-mic 100 nF ×4	0603 X7R ≥6.3 V	Select at BOM lock	Widely stocked	Basic candidate	typically < $0.003	Pass.
4.4	Per-mic 1 µF ×4	0603/0805 X7R ≥6.3 V	Select at BOM lock	Widely stocked	Basic candidate	typically $0.003–0.01	Pass.
4.4	Optional SCK/WS series, 33 Ω ×2	0603 1% 33 Ω	Select only if routing condition triggers	Widely stocked	Basic candidate	typically < $0.002	Feasible; DNI unless stubs exceed the spec threshold.
4.5	Active 3 V buzzer, TH	TMB12A03	C96222	Listed	Hand-solder / exclude PCBA	recheck	Candidate only; verify that the current listing is the active 3 V variant before purchase. Do not use passive PS1240 parts.
4.5	Buzzer NPN	MMBT2222ALT1G	C82460	Listed	Extended	recheck	Pass; onsemi 40 V / 600 mA SOT-23. BC817 would also satisfy the allowed class but is not proposed as a substitution.
4.5	Motor NPN	MMBT2222ALT1G	C82460	Listed	Extended	recheck	Pass, same driver candidate. Motor current must remain within device/thermal limits.
4.5	Base resistors, 1 kΩ ×2	0603 1% 1 kΩ	Select at BOM lock	Widely stocked	Basic candidate	typically < $0.002	Pass.
4.5	Flyback diodes ×2	1N4148W, SOD-123	Select at BOM lock	Widely stocked	Basic candidate	typically $0.005–0.02	Pass; exact vendor not electrically material.
4.5	Motor bulk, 470 µF	470 µF low-ESR aluminum electrolytic, voltage ≥6.3 V	Select after footprint/height check	Available, but mechanically constrained	Extended	typically $0.10–0.40	Feasible; exact MPN must be chosen against enclosure height and ripple-current needs.
4.5	Motor bypass, 100 nF	0603 X7R ≥16 V	Select at BOM lock	Widely stocked	Basic candidate	typically < $0.003	Pass.
4.5	Addressable RGB LED	WS2812B-V6	C52917433	41,490	Extended	$0.1013 (5+)	Electrical hard-check pass: VDD 3.3–5.3 V. Package is 5050; owner approval required before replacing the XL-1615-class example.
4.5	Smaller alternate RGB LED	WS2812B-2020-V6	C52917434	Out of stock	Extended	$0.091 (5+) when available	Electrically compliant at VDD 3.3–5.3 V, but unavailable today. Closest compliant size alternative; do not select without approval and stock recovery.
4.5	Rejected RGB listing	XL-1615RGBC-2812B	C5349954	377,140	Extended	$0.0631 (10+)	Fail: LCSC states VDD 4.5–5.5 V. Not compliant with the 3.3 V hard requirement.
4.5	LED series resistor	330 Ω, 0603 1%	Select at BOM lock	Widely stocked	Basic candidate	typically < $0.002	Pass.
4.5	LED local bulk, 100 µF	100 µF aluminum/polymer, voltage ≥6.3 V	Select after footprint/height check	Available	Extended	typically $0.05–0.25	Feasible; exact MPN is mechanical/ESR dependent.
4.5	Snooze SMD tactile	TS-1187A-B-A-B	C318884	Listed	Extended	recheck	Pass candidate; 5.1 × 5.1 mm SMD.
4.5	Optional debounce, 100 nF	0603 X7R ≥16 V	Select at BOM lock	Widely stocked	Basic candidate	typically < $0.003	Pass/DNI option.
4.6	E-paper 8-pin 2.54 mm header	Generic 1×8, 2.54 mm straight male header	Select for hand solder	Widely stocked	Hand-solder / exclude PCBA	typically $0.05–0.30	Pass; cable-order/silkscreen requirement is more important than vendor.
4.7	Frozen LoRa module	RFM95W-915S2	C6760738	Listed; live quantity not confirmed	Extended	recheck	LCSC listing exists, but stock certainty is weaker than the approved alternative. Band-specific suffix must match deployment choice.
4.7	Approved LoRa alternative	Ra-01H	C503593	1,605	Extended	recheck	Available approved fallback, 3.3 V SPI LoRa module. Per spec, ask before changing footprint/module.
4.7	Wire/spring antenna	External 868 or 915 MHz wire/spring element	No single frozen MPN	User/region supplied	Hand fit	varies	Feasible; band-specific physical element must be selected for the deployment band.
4.8	Test points	SMD copper test pads / no purchased component	N/A	N/A	N/A	$0	Implemented as PCB features, not BOM parts.
4.3	Protected 1S ~3000 mAh pouch cell	Purchased separately	Not on LCSC/JLC BOM	Excluded	Excluded	N/A	Correctly excluded from PCBA and university lab use.
4.5	ERM vibration motor	Enclosure-mounted flying-lead motor	Purchased separately	Excluded	Excluded	N/A	Board contains two solder pads only; no motor is placed by JLC.

Availability flags and closest compliant alternatives

RGB LED: The small XL-1615 addressable listing fails the 3.3 V requirement. The stocked compliant alternative is WS2812B-V6 / C52917433, but it is a larger 5050 package. The closer-size compliant WS2812B-2020-V6 / C52917434 is currently out of stock. Approval is required before either schematic choice.
RFM95W: LCSC lists RFM95W variants, but current quantity was not reliably exposed during this check. The specification's already-approved closest alternative, Ra-01H / C503593, has 1,605 in stock. Ask before changing module/footprint.
Mechanically dependent parts: 470 µF and 100 µF bulk capacitors, the 1 µH high-current inductor, ferrite bead, buzzer, header, and switch are available product classes, but their final exact MPNs require the frozen electrical/mechanical constraints to be applied in their respective objectives. This report does not authorize substitutions or schematic changes.

Go / no-go conclusion

Conditional GO for capture: The design is broadly JLC-assemblable and the bare ICS-43434 requirement is currently feasible. Capture should not begin until the owner approves one 3.3 V-rated RGB LED/package and confirms whether to retain an RFM95W suffix or invoke the already-approved Ra-01H fallback. All inventory and JLC Basic/Extended classifications should be refreshed in the JLC BOM tool immediately before the BOM is frozen.

Executive feasibility result
Owner approvals frozen after Objective 1
§4 sourcing matrix
Availability flags and closest compliant alternatives
Go / no-go conclusion