4 layers
4 layers
Back
ayukmr/pendant1LED matrix pendant using an ATSAMD21
- Copper layers
- 4
- Thickness
- 1 mm
- Parts
- 62
- Nets
- 69
- Pads
- 176
- Tracks, vias
- 438, 90
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 7 Mar 2026
- Updated
- 10 Oct 2026
Overview
Back is an open-source printed circuit board by ayukmr, from the ayukmr/pendant repository on GitHub, published under the MIT licence. It is a 4-layer board with 62 parts on 69 nets, routed with 438 tracks and 90 vias.
It is built around the ATSAMD21G18A-AU, LIS3DH and TP4057. Its parts include 22 resistors, 11 capacitors, 4 ICs and 2 connectors. It belongs with the lEDs and displays boards and the SAM D and SAM boards of this library.
Main components
3
ATSAMD21G18A-AU
TQFP-48-40℃~+85℃ 1.62V~3.6V 10bit 12bit 256KB 32 Bit 32KB 38 48MHz ARM Cortex-M0+ Built-in FLASH 上电复位(POR)、欠压检测(BOR/LVD/LVR/LVI)、看门狗复位、内置通用定时器、硬件CRC、日历功能、触控功能 TQFP-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
LIS3DH
LGA-16(3x3)-40℃~+85℃ 1.71V~3.6V 16bit 500nA Accelerometer Motion event detection SPI、I2C X,Y,Z ±16g LGA-16(3x3) Accelerometers ROHSSTMicroelectronicsAccelerometers
TP4057
SOT-23-6-40℃~+85℃ 1 25uA 4.24V 4V~6.5V Charging IC Lithium Battery Not supported SOT-23-6 Battery Management ROHSTECH PUBLICBattery Management
README
README.mdpendant
Pendant with a charlieplexed LED matrix using an ATSAMD21.
Demo
Schematic
PCB
Parts
62| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 120 | Resistor_SMD:R_0402_1005Metric | R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15 |
| 15 | TestPoint | Project:THT_D0.8_Pad1.6x1.6 | TP21, TP22, TP23, TP24, TP25, TP26, TP27, TP28, TP29, TP30, TP31, TP32, TP33, TP34, TP35 |
| 5 | 100 nF | Capacitor_SMD:C_0402_1005Metric | C5, C6, C7, C9, C10 |
| 5 | TestPoint | Project:Pad_SMD_1.5x1.5 | TP1, TP2, TP3, TP4, TP5 |
| 3 | 1 uF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C8 |
| 2 | 10 uF | Capacitor_SMD:C_0603_1608Metric | C3, C4 |
| 2 | 10k | Resistor_SMD:R_0402_1005Metric | R22, R23 |
| 2 | 22 | Resistor_SMD:R_0402_1005Metric | R16, R17 |
| 2 | 2k | Resistor_SMD:R_0402_1005Metric | R18, R19 |
| 1 | 4.7 uF | Capacitor_SMD:C_0603_1608Metric | C11 |
| 1 | 75k | Resistor_SMD:R_0402_1005Metric | R21 |
| 1 | ATSAMD21G18A-A | Package_QFP:TQFP-48_7x7mm_P0.5mm | U1 |
| 1 | Conn_01x02 | Connector_JST:JST_SH_SM02B-SRSS-TB_1x02-1MP_P1.00mm_Horizontal | J1 |
| 1 | LIS3DH | Package_LGA:LGA-16_3x3mm_P0.5mm_LayoutBorder3x5y | U2 |
| 1 | LOGO | LOGO | G*** |
| 1 | TP4057 | Package_TO_SOT_SMD:TSOT-23-6 | U4 |
| 1 | USB_B_Micro | Project:MICRO-USB-SMD_47346-0001 | J2 |
| 1 | XC6206PxxxMR | Package_TO_SOT_SMD:SOT-23-3 | U3 |
The 60 most common of 62 parts.
Questions
What parts does the Back use?
62 parts, built around the ATSAMD21G18A-AU, LIS3DH and TP4057. 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 Back KiCad files?
From the ayukmr/pendant repository on GitHub, at the commit this page was made from: the board is pcb/back/back.kicad_pcb and its schematic pcb/back/back.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Back design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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