2 layers88.2 × 28.1 mm
2 layers63.4 × 28.1 mm
Pacer
object1037/PacerA Pomodoro timer to help you focus.
- Size
- 63.4 × 28.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 35
- Nets
- 80
- Pads
- 223
- Tracks, vias
- 380, 56
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 24 Jul 2026
- Updated
- 28 Oct 2026
Overview
Pacer is an open-source printed circuit board by object1037, from the object1037/Pacer repository on GitHub. It is a 2-layer board of 63.4 × 28.1 mm with 35 parts on 80 nets, routed with 380 tracks and 56 vias.
It is built around the XCL103D333CR-G, 74HC595 and BU4210G-TR, with the OSX10201-Y among its other parts. Its parts include 10 capacitors, 6 ICs, 3 resistors, 3 connectors and 1 diode. It belongs with the RISC-V boards of this library.
Main components
4
XCL103D333CR-G
TDFN-6-EP(2x2.5)-40℃~+85℃ 1 1mm 2.5mm 2mm 3.234V~3.366V 350mA 3MHz 86% 900mV~6V Boost Short Circuit Protection、Over Current Protection、Light load efficient mode ±2% TDFN-6-EP(2x2.5) DC-DC Converters ROHSTorex SemiconductorDC-DC Power Modules
74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers
BU4210G-TR
SSOP-5-1.6mm-40℃~+125℃@(Tj) 1 150nA 1V 900mV~4.8V Active Low No No Open Drain Voltage Detector SSOP-5-1.6mm Supervisor and Reset ICs ROHSROHM SemiconductorSupervisor And Reset ICsOSX10201-Y
-- Lack of specifications ROHSOptoSupplyUncategorised
README
hardware/README.mdPacer hardware
- jlcpcb/production_files: Production files (Gerber + Assembly)
- case: Case 3D data
- BOM_ext.md: Extra parts for hand-soldering and assembly
Parts
35| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 4.7k | Resistor_SMD:R_Array_Convex_4x0603 | RN1, RN2, RN3, RN4, RN5 |
| 4 | 0.1u | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C1, C8, C9, C10 |
| 3 | 74HC595 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U4, U5, U6 |
| 2 | 10u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2, C3 |
| 2 | 30p | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C4, C5 |
| 2 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2, J3 |
| 2 | OSX10201-Y | Display:HDSP-4840 | BAR1, BAR2 |
| 1 | 1.2k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1 |
| 1 | 100p | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C6 |
| 1 | 1k | Resistor_SMD:R_Array_Convex_4x0603 | RN6 |
| 1 | 1n | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C7 |
| 1 | 5.6k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3 |
| 1 | BU4210G-TR | My_lib:SSOP5 | U3 |
| 1 | CH32V003FxPx | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | Crystal_GND24 | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | D | My_lib:SOD-123FL | D5 |
| 1 | LOGO | LOGO | G*** |
| 1 | OSX05201-GGR1 | My_lib:OSX05201-GGR1 | BAR3 |
| 1 | SW_SPDT | My_lib:SW_SPDT_IS-1245T | SW1 |
| 1 | XCL103D333CR-G | My_lib:CL2025-02 | U2 |
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Questions
How big is the Pacer PCB?
It measures 63.4 × 28.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Pacer use?
35 parts, built around the XCL103D333CR-G, 74HC595, BU4210G-TR and OSX10201-Y. 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 Pacer KiCad files?
From the object1037/Pacer repository on GitHub, at the commit this page was made from: the board is hardware/pacer.kicad_pcb and its schematic hardware/pacer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pacer design in my own project?
Its repository states no licence, so its author keeps all rights: ask object1037 before reusing the design.