2 layers
2 layers60 × 48 mm
Digital clock
ngyuheng/digital-clockThis hardware project is a simple digital clock built using an Arduino Nano, a TM1637 4-digit 7-segment display, and a DS3231 real-time clock (RTC) module.
- Size
- 60 × 48 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 8
- Nets
- 32
- Pads
- 48
- Tracks, vias
- 43, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 3 Apr 2026
- Updated
- 4 Apr 2026
Overview
Digital clock is an open-source printed circuit board by ngyuheng, from the ngyuheng/digital-clock repository on GitHub. It is a 2-layer board of 60 × 48 mm with 8 parts on 32 nets, routed with 43 tracks and 0 vias.
It is built around the TM1637 and DS3231S#. Its parts include 2 resistors and 2 connectors. It belongs with the lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2README
README.mdSimple Digital Clock
Description
This hardware project is a simple digital clock built using an Arduino Nano, a TM1637 4-digit 7-segment display, and a DS3231 real-time clock (RTC) module.
Rationale for Project
I wanted to start off with a simple project to practice and learn CADding and PCB designing. This project is relatively simple with only a few components, so it was a good opportunity for me to build something with Hackclub.
Wiring
Connect the TM1637 and 9V battery holder to the Arduino Nano by connecting the JST connectors to their corresponding pins.
Bill of Materials
Parts
8| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2 |
| 1 | Arduino_Nano_v3.x | Module:Arduino_Nano | A1 |
| 1 | Battery_Cell | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | BT1 |
| 1 | DS3231 | ds3231:DS3231 | J1 |
| 1 | TM1637 | Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J2 |
The 6 most common of 8 parts.
Questions
How big is the Digital clock PCB?
It measures 60 × 48 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Digital clock use?
8 parts, built around the TM1637 and DS3231S#. 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 Digital clock KiCad files?
From the ngyuheng/digital-clock repository on GitHub, at the commit this page was made from: the board is PCB/digital clock.kicad_pcb and its schematic PCB/digital clock.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Digital clock design in my own project?
Its repository states no licence, so its author keeps all rights: ask ngyuheng before reusing the design.
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