4 layers33.2 × 33.2 mm
Matrix
picafe/pendant
A pendant built from two PCBs: a 8×8 bicolor LED matrix module (red, orange, green) and controller board with battery charging, USB-C power, 5 V boost, and motion sensing.
12 parts
4 layers33.2 × 33.2 mm
Pendant
picafe/pendantA pendant built from two PCBs: a 8×8 bicolor LED matrix module (red, orange, green) and controller board with battery charging, USB-C power, 5 V boost, and motion sensing.
- Size
- 33.2 × 33.2 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 46
- Nets
- 49
- Pads
- 177
- Tracks, vias
- 189, 55
- Pours
- 19
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 20 Jun 2026
- Updated
- 21 Jul 2026
Overview
Pendant is an open-source printed circuit board by picafe, from the picafe/pendant repository on GitHub. It is a 4-layer board of 33.2 × 33.2 mm with 46 parts on 49 nets, routed with 189 tracks and 55 vias.
It is built around the LIS2DW12TR-MS, STM32C071G8U6 and TP4056-42-ESOP8, with the TPS61022, XC6206P332MR and BSS138W among its other parts. Its parts include 13 capacitors, 13 resistors, 5 ICs, 5 connectors and 3 diodes. It belongs with the STM32 boards of this library.
Main components
10
LIS2DW12TR-MS
LGA-12(2x2)-40℃~+85℃ 1.71V~3.6V 12bit 500nA Accelerometer SPI、I2C X,Y,Z ±16g LGA-12(2x2) Accelerometers ROHSMSKSEMIAccelerometers
STM32C071G8U6
UFQFPN-28(4x4)UncategorisedSTMicroelectronics
TP4056-42-ESOP8
ESOP-8-40℃~+85℃ 1 1A 2uA 4.2V 4V~8V Charging IC Lithium Battery Support ESOP-8 Battery Management ROHSTOPPOWERBattery Management
TPS61022
UncategorisedTexas Instruments
XC6206P332MR
SOT-23-40℃~+85℃@(Ta) 1 1uA 200mA 3.3V 6V Fixed Over Current Protection Positive SOT-23-3L Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTorex SemiconductorVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BSS138W
SOT-323MOSFETshongjiachengBAT54CW
SOT-323-3-65℃~+125℃ 1 Pair Common Cathode 1V@100mA 200mA 2uA@25V 30V 600mA SOT-323-3 Schottky Diodes ROHSDiodes IncorporatedSchottky Diodes
FXL0530-1R0-M
SMD,5.4x5.2mm11A 14mΩ 1uH 8.5A Molded inductor ±20% SMD,5.4x5.2mm Molding Power Inductors ROHScjiangPower Inductors
SMD1206B150TFT
1206-40℃~+85℃ 1.5A 1.6mm 1.8mm 100A 120mΩ 3.4mm 300ms 30mΩ 3A 800mW 8V 1206 Resettable Fuses ROHSBrightkingResettable Fuses
SS34
SMA(DO-214AC)-55℃~+125℃ 3A 40V 500uA@40V 550mV@3A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
README
README.mdBicolor LED Pendant
A pendant built from two PCBs: a 8×8 bicolor LED matrix module (red, orange, green) and controller board with battery charging, USB-C power, 5 V boost, and motion sensing.
Why I made this
I had already been working on a 32×8 bicolor matrix module and wanted to try the Pendant YSWS before the deadline. An example on the pendant website inspired me to make a bicolor version with an orange fire-style pattern. Fitting the full matrix and controller on one 2/4 layer board was not the most possible, so my design splits into a display PCB and a pendant controller, which are connected with 2.54mm pitch pin headers (likely just male machine pin headers soldered on both sides, since they have a larger spacing to accomodate for the inductor). There is also an accelerometer to have potential particle motion simulation.
Photos
3D model
Schematic
Controller
Matrix
PCB layouts
Controller board
Matrix module
Connections
All signals between the two boards are carried on PCB-mounted 2.54 mm pin headers. No off-board wiring is required beyond a LiPo cell on the controller.
Bill of materials
Prices are per-unit LCSC values; standard connector values are estimated.
Controller PCB
| Ref | Qty | Value | LCSC | Unit | Extended |
|---|---|---|---|---|---|
| U3 | 1 | STM32C071G8U6 | C44521811 | $1.67 | $1.67 |
| U4 | 1 | TPS61022 | C915088 | $1.32 | $1.32 |
| U5 | 1 | LIS2DW12TR | C189624 | $1.25 | $1.25 |
| U1 | 1 | XC6206P332MR | C5446 | $0.102 | $0.10 |
| U6 | 1 | TP4056-42-ESOP8 | C16581 | $0.19 | $0.19 |
| L1 | 1 | FXL0530-1R0-M | C475517 | $0.17 | $0.17 |
| Q1, Q2, Q3 | 3 | BSS138W | C28646265 | $0.025 | $0.08 |
| D1 | 1 | BAT54CW | C22392482 | $0.035 | $0.04 |
| D2 | 1 | Red LED | C2286 | $0.009 | $0.01 |
| D3 | 1 | SS34 | C8678 | $0.030 | $0.03 |
| F1 | 1 | SMD1206B150TFT | C269120 | $0.03 | $0.03 |
| S1 | 1 | Tactile button | C720477 | $0.053 | $0.05 |
| J4 | 1 | USB-C receptacle | C18357552 | $0.08 | $0.08 |
| J1 | 1 | JST-SH 4-pin | - | $0.08 (est.) | $0.08 |
| J2, J3 | 2 | 4-pin pin socket | - | $0.05 (est.) | $0.10 |
| J5 | 1 | 2-pin pin socket | - | $0.03 (est.) | $0.03 |
| C9–C13 | 5 | 10 µF | C440198 | $0.069 | $0.35 |
| C1 | 1 | 4.7 µF | C19666 | $0.014 | $0.01 |
| C8 | 1 | 10 µF | C96446 | $0.021 | $0.02 |
| C3, C4, C7 | 3 | 100 nF | C14663 | $0.006 | $0.02 |
| C5 | 1 | 1 µF | C15849 | $0.008 | $0.01 |
| C6 | 1 | 1 µF | C28323 | $0.012 | $0.01 |
| C2 | 1 | 100 nF | C1525 | $0.004 | $0.00 |
| R10–R11, R8–R9 | 4 | 4.7 kΩ | C25900 | $0.004 | $0.02 |
| R4, R5 | 2 | 5.1 kΩ | C25905 | $0.004 | $0.01 |
| R2, R6 | 2 | 100 kΩ | C25741 | $0.004 | $0.01 |
| R1 | 1 | 750 kΩ | C23240 | $0.004 | $0.00 |
| R3 | 1 | 1 kΩ | C11702 | $0.004 | $0.00 |
| R7 | 1 | 10 kΩ | C25804 | $0.004 | $0.00 |
| R12 | 1 | 10 kΩ | C25744 | $0.004 | $0.00 |
| R13 | 1 | 120 Ω | C25079 | $0.004 | $0.00 |
Controller subtotal: $5.71
Matrix PCB
| Ref | Qty | Value | LCSC | Unit | Extended |
|---|---|---|---|---|---|
| U1 | 1 | HT16K33A-28SSOP | C5444738 | $0.50 | $0.50 |
| LED1 | 1 | 8×8 bicolor LED matrix | - | $1.50 (est.) | $1.50 |
| R1–R3 | 3 | 47 kΩ | C25819 | $0.004 | $0.01 |
| C1 | 1 | 100 nF | C14663 | $0.006 | $0.01 |
| D1 | 1 | 1N4148WS | C2128 | $0.012 | $0.01 |
| J1, J2 | 2 | 4-pin pin socket | - | $0.05 (est.) | $0.10 |
Matrix subtotal: $2.13
Total component cost
| Board | Subtotal |
|---|---|
| Controller | $5.71 |
| Matrix | $2.13 |
| Grand total (1× each board) | $7.84 |
Does not include PCB fabrication, shipping, LiPo battery, or assembly fees.
Parts
46| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10uF | PCM_JLCPCB:C_0805 | C9, C10, C11, C12, C13 |
| 4 | 4.7kΩ | PCM_JLCPCB:R_0402 | R8, R9, R10, R11 |
| 3 | 100nF | PCM_JLCPCB:C_0603 | C3, C4, C7 |
| 3 | BSS138W | Package_TO_SOT_SMD:SOT-323_SC-70 | Q1, Q2, Q3 |
| 2 | 100kΩ | PCM_JLCPCB:R_0402 | R2, R6 |
| 2 | 5.1kΩ | PCM_JLCPCB:R_0402 | R4, R5 |
| 2 | Conn_01x04_Socket | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J2, J3 |
| 1 | 100nF | PCM_JLCPCB:C_0402 | C2 |
| 1 | 10kΩ | PCM_JLCPCB:R_0603 | R7 |
| 1 | 10kΩ | PCM_JLCPCB:R_0402 | R12 |
| 1 | 10uF | PCM_JLCPCB:C_0603 | C8 |
| 1 | 120Ω | PCM_JLCPCB:R_0402 | R13 |
| 1 | 1kΩ | PCM_JLCPCB:R_0402 | R3 |
| 1 | 1uF | PCM_JLCPCB:C_0805 | C6 |
| 1 | 1uF | PCM_JLCPCB:C_0603 | C5 |
| 1 | 4.7uF | PCM_JLCPCB:C_0603 | C1 |
| 1 | 750kΩ | PCM_JLCPCB:R_0603 | R1 |
| 1 | BAT54CW | Package_TO_SOT_SMD:SOT-323_SC-70 | D1 |
| 1 | Conn_01x02_Socket | Connector_PinSocket_2.00mm:PinSocket_1x02_P2.00mm_Vertical | J5 |
| 1 | Conn_01x04_Socket | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J1 |
| 1 | FXL0530-1R0-M | easyeda2kicad:IND-SMD_L5.4-W5.2_FXL0530 | L1 |
| 1 | LIS2DW12TR | easyeda2kicad:LGA-12_L2.0-W2.0-P0.50-BL | U5 |
| 1 | Red | PCM_JLCPCB:D_0603 | D2 |
| 1 | SMD1206B150TFT | easyeda2kicad:F1206 | F1 |
| 1 | SS34 | PCM_JLCPCB:D_SMA | D3 |
| 1 | STM32C071G8U6 | easyeda2kicad:QFN-28_L4.0-W4.0-P0.50-TL | U3 |
| 1 | TP4056-42-ESOP8 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm_ThermalVias | U6 |
| 1 | TPS61022 | Package_DFN_QFN:Texas_RWU0007A_VQFN-7_2x2mm_P0.5mm | U4 |
| 1 | Tactile Button, 160gf | Button_Switch_SMD:SW_SPST_TS-1088-xR020 | S1 |
| 1 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP1 |
| 1 | USB_C_Receptacle_PowerOnly_6P | easyeda2kicad:USB-C-SMD_HX-TYPE-C-6PIN | J4 |
| 1 | XC6206P332MR | Package_TO_SOT_SMD:SOT-23-3 | U1 |
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Questions
How big is the Pendant PCB?
It measures 33.2 × 33.2 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Pendant use?
46 parts, built around the LIS2DW12TR-MS, STM32C071G8U6, TP4056-42-ESOP8 and TPS61022. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Pendant KiCad files?
From the picafe/pendant repository on GitHub, at the commit this page was made from: the board is controller/pendant.kicad_pcb and its schematic controller/pendant.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pendant design in my own project?
Its repository states no licence, so its author keeps all rights: ask picafe before reusing the design.