2 layers53.9 × 62.6 mm
Moon light
HeyPCB/moon-light
Luna, the night-light moon: A sleepy moon that turns on at dusk and tucks itself in after you fall asleep. KiCad 10, heypcb.ai merch.
36 parts1CERN-OHL-S-2.0
2 layers69.6 × 66.4 mm
Pomodoro pal
HeyPCB/pomodoro-palPomodoro Pal: A tomato on your desk that keeps you focused for 25 minutes, without your phone. KiCad 10, heypcb.ai merch.
- Size
- 69.6 × 66.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 41
- Nets
- 42
- Pads
- 116
- Tracks, vias
- 268, 24
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 5 Oct 2026
- Updated
- 5 Oct 2026
Overview
Pomodoro pal is an open-source printed circuit board by HeyPCB, from the HeyPCB/pomodoro-pal repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 69.6 × 66.4 mm with 41 parts on 42 nets, routed with 268 tracks and 24 vias.
It is built around the CH32V003F4P6, KT-0603R and CC0603KRX7R9BB104, with the CL21A106KAYNNNE, PKMCS0909E4000-R1 and TYPE-C-31-M-12 among its other parts. Its parts include 18 resistors, 14 diodes, 2 capacitors, 1 IC and 1 connector. It belongs with the RISC-V boards of this library.
Main components
6
CH32V003F4P6
TSSOP-20-175milTSSOP-20-175mil Microcontrollers (MCU/MPU/SOC) ROHSWCH (Nanjing Qinheng Microelectronics)Microcontrollers (MCU/MPU/SOC)
KT-0603R
0603-40℃~+85℃ 1.6mm x 0.8mm square LED 1.8V~2.4V 120° 20mA 300mcd 40mW 615nm~630nm 645nm Discrete Diode Red Water Clear 0603 LED Indication - Discrete ROHSHubei KENTO ElecLED Indication - Discrete
CC0603KRX7R9BB104
0603100nF 50V X7R ±10% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMT
CL21A106KAYNNNE
080510uF 25V X5R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
PKMCS0909E4000-R1
SMD,9x9mm-40℃~+85℃ 1.9mm 12.5V 4kHz 65dB 9mm 9mm Passive (Externally Driven) Piezoelectric SMD,9x9mm Buzzers ROHSMurataBuzzers
TYPE-C-31-M-12
SMD-30℃~+80℃ 1 10,000 cycles 16P 20V 5A 7.35mm Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSHRO ElectronicsUSB Connectors
README
README.mdPomodoro Pal
A tomato on your desk that keeps you focused for 25 minutes, without your phone.
Pomodoro Pal is a tomato-shaped Pomodoro timer that lies flat on your desk, powered over USB-C. Tap the gold pad in its calyx to start a 25-minute focus session: twelve red LEDs around its face go out one by one, clockwise, and the next one to go out breathes. At the end it chirps softly and its two green leaf tips glow through a 5-minute break (15 minutes after every fourth session).
| Layers | Size | Parts | Nets | Connections routed | Vias | ERC errors | DRC errors / unconnected / parity | BOM @100 |
|---|---|---|---|---|---|---|---|---|
| 2 | 69.7 x 66.5 mm | 37 (+4 pads) | 38 | 68 -> 0 open | 24 | 0 | 0 / 0 / 0 | $1.48 |
Not fabricated, assembled or powered yet. Every number on this page is measured by KiCad 10.0.6 on
the files in this repository (report.json, measured.json) or read
from the live JLC/LCSC catalogue (bom_cost.json).
| Spec, power budget, BOM | SPEC.md |
| Store copy | STORE_COPY.md |
| KiCad 10 project | kicad/ |
| Gerbers, drill, BOM, CPL, STEP, schematic PDF | fab/ |
| Firmware | firmware/ |
| Renders | front, back, hero, Circuit World thumbnail |
| Brief and generator | design/ |
What's on it
- MCU: CH32V003F4P6 (TSSOP-20, 48 MHz RISC-V) running straight from 5 V, no regulator.
- Clock face: 12 red 0603 LEDs in a 40 mm ring, each with its 1 kΩ resistor laid inside the ring like a minute tick; silk clock ticks outside.
- Break light: two green 0603 LEDs at the gold calyx's leaf tips.
- Touch: a 4 mm ENIG pad in the calyx, read by the ADC's charge-sharing touch method (ch32fun) through 1 kΩ.
- Sound: a 9 mm Murata PKMCS0909E piezo straight from a pin, for soft chirps.
- Power: USB-C with 5.1 kΩ CC pull-downs; about 45 mA at most (SPEC.md).
- Programming: three SWIO pads (VDD, SWIO, GND) for a WCH-LinkE.
Finish
Red solder mask, White silkscreen, ENIG copper finish, 1.6 mm FR4, top-side SMT assembly (J1: an SMD part whose shell legs go through plated holes, soldered on the same SMT line). The gold art is bare copper under a mask opening (ENIG), drawn with its own keep-out so no track runs under it. The QR code on the back opens https://heypcb.ai/world/b/ef5f52604753.
How it was made
Designed with the HeyPCB method on KiCad 10.0.6, headless, by the heypcb-kicad pipeline: a written
brief composed from reusable circuit blocks, every pin from KiCad's own symbol library, every part bound
to an LCSC number from a dated catalogue read, then ERC, a netlist round trip, locked placement,
Freerouting 2.4.1, pours, silkscreen and board art, DRC with schematic parity, DFM and a fab gate,
each stage gated by a measurement. design/make_brief.py regenerates the brief (outline, part
locks and art) from code.
Part of the heypcb.ai merch collection.
License
Hardware: CERN-OHL-S v2. Firmware: MIT (see firmware/LICENSE). KiCad's symbol, footprint and 3D
libraries used in the design are CC-BY-SA 4.0 with the KiCad library exception.
Parts
41| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 1k | Resistor_SMD:R_0603_1608Metric | R3, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18 |
| 12 | Red | LED_SMD:LED_0603_1608Metric | D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | Green | LED_SMD:LED_0603_1608Metric | D1, D2 |
| 1 | 100 | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric | C2 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | CH32V003F4P6 | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1 |
| 1 | GND | TestPoint:TestPoint_Pad_1.0x1.0mm | TP3 |
| 1 | PKMCS0909E4000 | Buzzer_Beeper:Buzzer_Murata_PKMCS0909E | BZ1 |
| 1 | SWIO | TestPoint:TestPoint_Pad_1.0x1.0mm | TP2 |
| 1 | TOUCH | TestPoint:TestPoint_Pad_D4.0mm | TP4 |
| 1 | USB-C | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | VDD | TestPoint:TestPoint_Pad_1.0x1.0mm | TP1 |
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Questions
How big is the Pomodoro pal PCB?
It measures 69.6 × 66.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Pomodoro pal use?
41 parts, built around the CH32V003F4P6, KT-0603R, CC0603KRX7R9BB104 and CL21A106KAYNNNE. 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 Pomodoro pal KiCad files?
From the HeyPCB/pomodoro-pal repository on GitHub, at the commit this page was made from: the board is kicad/pomodoro_pal.kicad_pcb and its schematic kicad/pomodoro_pal.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pomodoro pal design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).