2 layers304.8 × 170.8 mm
2 layers77.5 × 72.9 mm
Rummikub timer
patrickhener/rummikub-timerA Rummikub Timer Project
- Size
- 77.5 × 72.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 17
- Nets
- 38
- Pads
- 73
- Tracks, vias
- 66, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 26 Aug 2025
- Updated
- 6 Oct 2025
Overview
Rummikub timer is an open-source printed circuit board by patrickhener, from the patrickhener/rummikub-timer repository on GitHub. It is a 2-layer board of 77.5 × 72.9 mm with 17 parts on 38 nets, routed with 66 tracks and 0 vias.
It is built around the IRLZ44N. Its parts include 6 connectors, 4 resistors, 4 switches and 1 transistor. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.mdRummikub Timer
This project is a Rummikub timer. It has the following functions:
- Set a countdown time (default: 1 minute)
- Start timer by pressing big button
- Reset and start timer by pressing it again
- Blink big button when reaching 10 second time zone
- Alarm if time is up
- Nice laser-cut enclosure
- Runs on battery
- Chargable via USB-C
- Incorporates a display
Hardware
The project consists of the following components:
- Arduino Nano
- LiPo Battery
- TP4056 USB-C charging
- Different push buttons (28mm, 100mm with LED)
- On/Off Switch
- Active Buzzer
- MT3608 Step-Up Converter
- 0,96" OLED Display
- Small components like resistors and a mosfet
Images
Lessons learned
The box is really tight, so I had to improvise and cut away from some of the buttons. Also The top button is not fixed into casing as it is to tight. But that in fact is better, so you can assamble and then maintaine it, by just pulling the big button out. As the button will be pushed it is not a problem it is not fixed anyways.
Hazard warning
If you build it like I did never run and charge at the same time. The missing safe charge circuit during load is not sharing the load, so the battery will be over-charged and might caught on fire. I DO NOT HOLD ACCOUNTABILITY FOR DAMAGE TO YOU OR YOUR SURROUNDINGS.
Parts
17| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | +_Button | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | SW3 |
| 1 | -_Button | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | SW4 |
| 1 | 100 KΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 100 Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 12V Booster | Rummikub-Timer:MT3608_module | J4 |
| 1 | 5V Booster | Rummikub-Timer:MT3608_module | J3 |
| 1 | Arduino_Nano_v3.x | Module:Arduino_Nano | A1 |
| 1 | BIG_BUTTON | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | SW2 |
| 1 | BIG_BUTTON_LED | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | Buzzer | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | BZ1 |
| 1 | IRLZ44N | Package_TO_SOT_THT:TO-220-3_Vertical | Q1 |
| 1 | LiPo Battery | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | OLED | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J6 |
| 1 | On/Off Switch | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | SW1 |
| 1 | TP4046 Charger Type-C | Rummikub-Timer:TP4056-18650 | J2 |
| 1 | Voltage Divider 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | Voltage Divider 220k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
Questions
How big is the Rummikub timer PCB?
It measures 77.5 × 72.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Rummikub timer use?
17 parts, built around the IRLZ44N. 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 Rummikub timer KiCad files?
From the patrickhener/rummikub-timer repository on GitHub, at the commit this page was made from: the board is schema/Rummikub_Timer.kicad_pcb and its schematic schema/Rummikub_Timer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Rummikub timer design in my own project?
Its repository states no licence, so its author keeps all rights: ask patrickhener before reusing the design.
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