2 layers22.2 × 46.4 mm
C64-Switchless Quad Kernal Switcher
bwack/C64-Switchless-Multi-Kernal-27C256-adapter
Kernal switcher for the C64/C64C/C128
14 parts112
2 layers62.2 × 35.6 mm
PomodoroTimer
puffadder/PomodoroTimerSchematic, PCB design and Arduino IDE code for a Pomodoro timer device
- Size
- 62.2 × 35.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 13
- Pads
- 47
- Tracks, vias
- 68, 0
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 4 Feb 2025
- Updated
- 8 Aug 2025
Overview
PomodoroTimer is an open-source printed circuit board by puffadder, from the puffadder/PomodoroTimer repository on GitHub, published under the MIT licence. It is a 2-layer board of 62.2 × 35.6 mm with 15 parts on 13 nets, routed with 68 tracks and 0 vias.
It is built around the ATTINY85-20PU. Its parts include 3 diodes, 2 switches, 1 capacitor, 1 IC and 1 connector. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.mdPomodoro Timer
The Pomodoro Timer is a timer designed to manage productivity using the Pomodoro Technique.
The work intervals are as follows:
There are three 25-minute work intervals, each separated by a break of 5 mins. After the fourth work session (or Pomodoro as I just call it), there is a longer 15 minute break. This cycle continues until the Pomodoro Timer is reset or powered off.
A buzzer goes off after every work or break interval. This can be turned off with a switch.
The LED blinks green if a work interval is starting and it blinks red if a break is starting.
The code is for an ATTiny85 microcontroller. The hardware and PCB design are shown below.
Contributing
Contributions are welcome! Please follow these steps to contribute:
- Fork the repository.
- Create a new branch for your feature or bug fix.
- Submit a pull request with a clear description of your changes.
License
This project is licensed under the MIT License. See the LICENSE file for details.
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 220R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | LED1_R1, LED2_R1 |
| 2 | 5.1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | CC1_R1, CC2_R1 |
| 1 | ATtiny85-20P | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | C_Polarized_US | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1 |
| 1 | LED | LED_THT:LED_D3.0mm-3 | D1 |
| 1 | SW_Push_Dual | Button_Switch_THT:SW_PUSH-12mm | SW1 |
| 1 | SW_SPST | Button_Switch_THT:SW_Push_2P2T_Toggle_CK_PVA2xxH4xxxxxxV2 | SW2 |
| 1 | USB_C_Receptacle_PowerOnly_6P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-17 | J1 |
The 11 most common of 15 parts.
Questions
How big is the PomodoroTimer PCB?
It measures 62.2 × 35.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PomodoroTimer use?
15 parts, built around the ATTINY85-20PU. 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 PomodoroTimer KiCad files?
From the puffadder/PomodoroTimer repository on GitHub, at the commit this page was made from: the board is pcb_design/pomodoro_timer.kicad_pcb and its schematic pcb_design/pomodoro_timer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the PomodoroTimer 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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