Pomodoro timer
About the Pomodoro timer PCB
Pomodoro timer is an open source ESP32 PCB design by hinewboy, published on GitHub under the MIT license. It is a 2-layer board measuring 84 × 66 mm, with 46 components from 33 distinct parts.
Its main chip is the C701342, from the ESP32 family. Other key parts include the C6186 and C84681. By type, the board carries 14 resistors, 13 capacitors, 5 switches, 4 diodes, 3 ICs and 3 transistors.
From the project
番茄钟 PCB 项目（KiCad）：原理图、布局布线自动化脚本、JLCPCB 打样生产文件
KiCad 番茄钟定时器 PCB 项目：原理图 + 程序化布局/布线 + JLCPCB 打样文件。
- v5 布线完成（pomodorotimerv5routed`），DRC 已过 - JLCPCB 生产文件已导出（Gerber / BOM / POS / 钻孔）
生产文件见 gerber/jlc/，一键打包 gerber/pomodorotimerjlc.zip，说明见 gerber/打样说明.md。
Main components on the Pomodoro timer
Pomodoro timer bill of materials (BOM)
46 components, 33 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | C701342 ESP32-WROOM-32E | ESP32-WROOM-32E | U1 |
| 1 | C6186 AMS1117-3.3 | SOT-223-3_TabPin2 | U2 |
| 1 | C84681 CH340C | SOIC-16_3.9x9.9mm_P1.27mm | U3 |
| 2 | MMBT3904 | SOT-23 | Q1, Q3 |
| 1 | SOT-23 MMBT3904 | SOT-23 | Q2 |
| 1 | C165948 USB-C | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | OLED | PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | EXP | PinHeader_1x06_P2.54mm_Vertical | J3 |
| 1 | C252940 BEEP | Buzzer_12x9.5RM7.6 | LS1 |
| 1 | C71841 EN | SW_PUSH_6mm | SW1 |
| 1 | C71841 BOOT | SW_PUSH_6mm | SW2 |
| 1 | C71841 START | SW_PUSH_6mm | SW3 |
| 1 | C71841 MODE | SW_PUSH_6mm | SW4 |
| 1 | C71841 RESET | SW_PUSH_6mm | SW5 |
| 1 | PWR | LED_0603_1608Metric | D2 |
| 1 | 1N4148W | D_SOD-123 | D3 |
| 1 | WORK | LED_0603_1608Metric | D4 |
| 1 | BREAK | LED_0603_1608Metric | D5 |
| 1 | 10UF 10uF | C_0603_1608Metric | C1 |
| 8 | 100nF | C_0603_1608Metric | C2, C4, C6, C7, C8, C9, C10, C13 |
Show 13 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 22UF 22uF | C_0603_1608Metric | C3 |
| 1 | 1UF 1uF | C_0603_1608Metric | C5 |
| 1 | C10 100nF | C_0603_1608Metric | C11 |
| 1 | 22uF | C_0603_1608Metric | C12 |
| 1 | 5.1k | R_0603_1608Metric | R1 |
| 1 | 5.1K 5.1k | R_0603_1608Metric | R2 |
| 2 | 1k | R_0603_1608Metric | R3, R11 |
| 1 | 10K 10k | R_0603_1608Metric | R4 |
| 5 | 10k | R_0603_1608Metric | R5, R8, R9, R10, R12 |
| 1 | 4.7K 4.7k | R_0603_1608Metric | R6 |
| 1 | 4.7k | R_0603_1608Metric | R7 |
| 1 | 470R | R_0603_1608Metric | R13 |
| 1 | 470R | R_0603_1608Metric | R14 |
Pomodoro timer design files
The KiCad project lives in the hinewboy/pomodoro-timer repository on GitHub; these links point at the commit this page was built from.
Pomodoro timer: common questions
What microcontroller does the Pomodoro timer use?
The Pomodoro timer is built around the C701342, from the ESP32 family.
How big is the Pomodoro timer PCB?
The Pomodoro timer measures 84 × 66 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Pomodoro timer?
46 components, from 33 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Pomodoro timer design files?
From the hinewboy/pomodoro-timer repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Pomodoro timer design in my own project?
Yes, under the terms of its MIT license, which hinewboy chose for the repository.
Can I test firmware for the Pomodoro timer without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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