4 layers68.6 × 53.3 mm
2 layers70 × 50 mm
Cronus
ashep/cronus4A minimalistic digital clock
- Size
- 70 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 44
- Pads
- 70
- Tracks, vias
- 49, 1
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 23 May 2024
- Updated
- 7 Nov 2026
Overview
Cronus is an open-source printed circuit board by ashep, from the ashep/cronus repository on GitHub, published under the MIT licence. It is a 2-layer board of 70 × 50 mm with 11 parts on 44 nets, routed with 49 tracks and 1 via.
It is built around the ESP32-S3 and DS3231S#. Its parts include 3 resistors, 3 connectors and 2 ICs. It belongs with the ESP32 boards of this library.
Main components
2README
README.mdCronus
Cronus is a minimalistic digital clock built on top of the ESP32 MCU with the following features in mind.
- Show the current time, date, and weather conditions.
- Simple, with a bright display.
- Brightness auto-adjustment depending on the ambient light level.
- No buttons.
- Automatic Over-the-Air firmware upgrades.
- No disgusting bloody Arduino.
See more
How to make it
See the Wiki.
Contributing
Clone the repo:
git clone --recurse-submodules https://github.com/ashep/cronus.gitOr update an already cloned one to the latest version:
git pull
git submodule update --recursive --remoteChangelog
0.0.5 (2026-01-11)
- Added air raid alerts widget.
- Added a "busy" icon upon OTA.
- Performance improvements and little optimizations.
0.0.4 (2025-09-30)
- Added widget color options for colorful screens.
- Added night mode options for colorful screens.
0.0.3 (2025-08-31)
- Added night mode for colorful screens.
- Added custom location option.
- Fixed Wi-Fi reconnection at startup.
0.0.2 (2025-08-11)
- New Bluetooth configuration interface added.
- Weather icons added.
0.0.1 (2025-06-21)
First stable release.
Authors
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | MountingHole | MountingHole:MountingHole_2.2mm_M2_DIN965_Pad | H1, H3, H4 |
| 2 | 10K | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2 |
| 2 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J3, J4 |
| 1 | 3K | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R3 |
| 1 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J8 |
| 1 | DS3231 | Cronus:DS3231-Dev-Board | U2 |
| 1 | ESP32-S3 | Cronus:ESP32-Dev-Board | U1 |
Questions
How big is the Cronus PCB?
It measures 70 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Cronus use?
11 parts, built around the ESP32-S3 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 Cronus KiCad files?
From the ashep/cronus repository on GitHub, at the commit this page was made from: the board is schematic/Cronus.kicad_pcb and its schematic schematic/Cronus.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Cronus 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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