ShieldSigner / build & use0.0.19-dev

TASK 02

Buy & source the parts

A complete shopping list: carrier components and the separate system parts.

You need
  • Your PCB/PCBA route
  • Luckfox Mini storage variant
You’ll have

Every carrier line identified, plus the parts needed to finish the device.

Your shopping list

The eight-pin pill is the current build: design & display pinout · header and support assembly. Select the standard FPC reference only when building that separate board.

For PCBA, JLC buys the SMT components. Buy the separate system parts yourself; switch to Carrier / PCBA to inspect the exact values, ratings and quantities.

Building the pill by hand? Optional DigiKey self-assembly BOM & CSV →

Eight-pin pill · 1 boardMatching BOM CSV ↓

Buy separately · 16 items

These are outside the 43-piece PCBA BOM. Card choices are alternatives; buy the one that fits your workflow.

Selected drawing; physical fit pending1 required

HOTHMI 2.8-inch eight-pin SPI LCD

HTM-TFT028A16-SPI, no touch, ST7789V, 88×53.3 mm. Use J1 1×8 at 2.54 mm; 3.3 V supply.

Carrier numbering is reversed from module J1. Its separate J2 connector is 2 mm and unused. Confirm purchased revision/header option.

Match boot medium1 required

microSD + USB card reader

Removable microSD with enough capacity for the selected image; card reader for your Mac. Use a known-good card from a reputable supplier.

Power budget requires bench test1 required

Regulated 5 V USB-C supply + cable

One regulated 5 V source. This carrier is not a charger or USB-PD design; do not power multiple inputs together.

Customer header soldering2 required

Luckfox carrier sockets

1×11 female, 2.54 mm pitch, 8.5 mm housing, accepts 0.64 mm square posts.

Confirm purchased dimensions1 required

LCD carrier socket

1×8 female, 2.54 mm pitch, 8.5 mm housing.

Confirm purchased dimensions1 required

LCD module male strip

1×8 at 2.54 mm, 2.54 mm insulator, 6 mm posts; omit if J1 is correctly preheadered.

Confirm purchased dimensions4 required

Display supports

M2.5 female-female, 12 mm body, nominal 5 mm outside diameter.

Confirm purchased dimensions8 required

Display mounting screws

M2.5×4, four at each PCB; check engagement with any washers.

Mechanical fit pending1 optional

New pill enclosure

160×70 mm carrier, raised 2.8-inch module, button plungers and card/camera/USB openings.

Old standard/Pico-bay cases do not fit; enclosure is not yet qualified.

Signing option1 optional

Contact Satochip card

Factory-installed applet; contact-capable product. On-card derivation/signing; choose this instead of SeedKeeper when that is your goal.

DIY alternative1 optional

Blank supported JavaCard

J3H145 or reviewed JCOP SECID alternative with known GlobalPlatform management keys. Install an applet before use.

Confirm purchased dimensions2 optional

Luckfox male strips if bare

1×11 at 2.54 mm; long posts toward carrier. Omit if correctly fitted.

Confirm purchased dimensions8 optional

Mounting washers if needed

M2.5, outside diameter no more than 5 mm in reserved hardware areas.

Carrier / PCBA · 18 catalog lines

43 fitted pieces / 18 catalog lines per carrier. Values and ratings are explicit. Catalog snapshots from 2026-11-01; stock is not reserved. Open each listing for current availability.

Value / ratingsPart / referencesQty / PCBYour qtyPackageSource
33 pF50 V · ±5% · NP0CC0805JRNPO9BN330C605,C606YAGEO22C_0805_2012Metric_Pad1.18x1.45mm_HandSolderC107115 ↗Extended
100 kΩ125 mW · ±1%0805W8F1003T5ER601,R606UNI-ROYAL(Uniroyal Elec)22R_0805_2012Metric_Pad1.20x1.40mm_HandSolderC149504 ↗Basic
10 µF25 V · ±10% · X5RCL21A106KAYNNNEC201,C302,C701,C702Samsung Electro-Mechanics44C_0805_2012Metric_Pad1.18x1.45mm_HandSolderC15850 ↗Basic
100 Ω125 mW · ±1%0805W8F1000T5ER602,R603UNI-ROYAL(Uniroyal Elec)22R_0805_2012Metric_Pad1.20x1.40mm_HandSolderC17408 ↗Basic
10 kΩ125 mW · ±1%0805W8F1002T5ER605,R607UNI-ROYAL(Uniroyal Elec)22R_0805_2012Metric_Pad1.20x1.40mm_HandSolderC17414 ↗Basic
47 Ω125 mW · ±1%0805W8F470JT5ER604UNI-ROYAL(Uniroyal Elec)11R_0805_2012Metric_Pad1.20x1.40mm_HandSolderC17714 ↗Basic
SMF5.0CA—SMF5.0CAD301hongjiacheng11D_SOD-123FC19077498 ↗Extended
KT-0805G—KT-0805GD302Hubei KENTO Elec11LED_0805_2012Metric_Pad1.15x1.40mm_HandSolderC2297 ↗Basic
PTS636SK25SMTRLFS—PTS636SK25SMTRLFSSW501,SW502,SW503,SW504,SW505,SW506,SW507,SW508C&K88CK_PTS636_SK25_GC2689642 ↗Extended
5.1 kΩ125 mW · ±1%0805W8F5101T5ER301,R302UNI-ROYAL(Uniroyal Elec)22R_0805_2012Metric_Pad1.20x1.40mm_HandSolderC27834 ↗Basic
1 µF50 V · ±10% · X7RCL21B105KBFNNNEC602,C603,C604Samsung Electro-Mechanics33C_0805_2012Metric_Pad1.18x1.45mm_HandSolderC28323 ↗Basic
560 Ω125 mW · ±1%0805W8F5600T5ER303UNI-ROYAL(Uniroyal Elec)11R_0805_2012Metric_Pad1.20x1.40mm_HandSolderC28636 ↗Basic
5015—5015TP901,TP902,TP903,TP904,TP905,TP906,TP907,TP908Keystone88Keystone_5015C2906768 ↗Extended
100 nF50 V · ±10% · X7RCC0805KRX7R9BB104C301,C601YAGEO22C_0805_2012Metric_Pad1.18x1.45mm_HandSolderC49678 ↗Basic
AP2112K-3.3TRG1—AP2112K-3.3TRG1U701Diodes Incorporated11AP2112K_SOT25_reflowC51118 ↗Extended
USB4125-GF-A-0190—USB4125-GF-A-0190J301Global Connector Technology11GCT_USB4125_GF_AC5246813 ↗Extended
7312P0225A13LF—7312P0225A13LFJ601Amphenol ICC11Amphenol_7312P0225A13LF_reflowC5417011 ↗Extended
SEC1210/PV-UR2—SEC1210/PV-UR2U601Microchip Tech11Microchip_SEC1210_QFN24_reflowC633309 ↗Extended

LCD, Luckfox, headers and supports are separate. Obsolete FPC/backlight lands and J302 are removed. PCB solder jumpers are copper, not purchased parts.

Use the carrier table for PCB components

  • For pill PCBA, JLC sources 43 fitted SMT placements from the matching BOM; do not buy a second loose set.
  • The table defaults to the eight-pin pill carrier. Select Standard FPC only when building that separate board. Values, ratings and quantities remain visible.

Buy the separate system parts

  • Luckfox Pico Mini with compatible microSD boot and matching SC3336 camera/ribbon.
  • HOTHMI HTM-TFT028A16-SPI, no-touch, using its J1 eight-pin 2.54 mm row; socket/header strips, 12 mm supports and short screws.
  • microSD, one regulated 5 V USB supply and a new pill enclosure. Add a compatible contact card only if using the smartcard features.

Confirm the exact module and hardware

  • The LCD is a 3.3 V module. Match the saved drawing and J1 row; do not buy the former Pico-format display or a bare FPC panel for this PCB.
  • Carrier header numbering runs opposite module J1 numbering. Verify all signals and the specified connector heights before soldering.
  • The old enclosure does not fit. Confirm supports, screw engagement, camera cable path and button plungers.
Continue the buildBuild & iterate on firmware →
Sources & deeper reference

Checked 2026-11-01. Menu names can vary with firmware.

Pill circuit choices and wiring ↗Pill catalog snapshot ↗Optional DigiKey self-assembly ↗Edit this workflow on GitHub ↗