# Clockstar 2.0 (CircuitMess)

> A kit for building and programming a smartwatch.

- **Category:** DIY & play
- **Availability:** Listed by maker
- **Price:** US$99 kit, checked 2026-09-15
- **Good for:** Build and program a Bluetooth smartwatch.
- **You'll need:** Kit assembly and CircuitBlocks.
- **Trade-off:** Confirm the board revision and supported phone software before flashing.
- **Page:** https://gadgets.sh/devices/clockstar-2-0/

## Where to buy

| Shop | Status | Link |
|---|---|---|
| CircuitMess | Orderable | https://circuitmess.com/products/clockstar-2-0?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=clockstar-2-0&utm_content=api |
| Amazon | Orderable | https://www.amazon.com/dp/B0GKPXZWRK?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=clockstar-2-0&utm_content=api |

## Blueprint

**Schematics published.** Schematic PDF and versioned firmware releases are public; no editable PCB source or Gerbers found.

### Design files

- schematic: [Clockstar 2.0 schematic (PDF)](https://cdn.shopify.com/s/files/1/0552/3269/2430/files/Clockstar_2.0_schema.pdf) (PDF)
- manual: [Clockstar 2.0 build booklet (PDF)](https://cdn.shopify.com/s/files/1/0552/3269/2430/files/Clockstar_2.0_booklet_2025_PRINT.pdf) (PDF)

### Source repositories

- [CircuitMess/Clockstar-v2-Firmware](https://github.com/CircuitMess/Clockstar-v2-Firmware) — firmware, ★2

### Key parts

| Part | Role | Datasheet |
|---|---|---|
| ESP32-S3-MINI-1-N4R2 | MCU | https://www.espressif.com/sites/default/files/documentation/esp32-s3-mini-1_esp32-s3-mini-1u_datasheet_en.pdf |

_Notes:_ Schematic PDF verified 200; Clockstar-v2-Firmware repo (2 stars) has a tagged v1.3 release, no license field, no hardware/KiCad directory found.

## Specifications

### Build and package

| | |
|---|---|
| Project | Build a programmable smartwatch; about 1 hour; beginner-friendly, ages 9+ |
| Included | Main board, acrylic case, watch strap, LiPo battery and screws |
| Assembly tool | Screwdriver included in the 2025 creator booklet |

### Hardware in the linked v2.4 drawing

| | |
|---|---|
| Processor | ESP32-S3-MINI-1-N4R2 |
| Display | Drawing labels a 1.44-inch TFT with a 12-pin connection |
| Battery | 600 mAh LiPo with a two-pin JST 1.25 connection |
| USB and charging | USB-C and TP4054 charging circuit |
| Motion and clock | LSM6DS3TR-C motion sensor and BM8563ESA real-time clock |
| Controls and feedback | Left/right/push lever, separate button, buzzer and RGB LED |

### Use and programming

| | |
|---|---|
| Built-in functions | Time, date, alarm and stopwatch; Bluetooth phone connection |
| Custom projects | CircuitBlocks watch faces, animations, timers, button actions and motion games; coding is optional |
| Stock recovery | CircuitBlocks Restore Firmware, or the revision-specific prebuilt binary using the repository’s instructions |
| Source build | Clockstar-v2 repository specifies ESP-IDF 5.1, recursive submodules and its ESP-IDF/LovyanGFX patches |
| Download reviewed | v1.3 release; notes updated Bluetooth functionality support |

## Documentation

- [Clockstar 2.0 product](https://circuitmess.com/products/clockstar-2-0)
- [Exact 2.0 guide and downloads](https://circuitmess.com/blogs/resources/clockstar-2-0-build-guide)
- [Clockstar 2.0 creator booklet PDF](https://cdn.shopify.com/s/files/1/0552/3269/2430/files/Clockstar_2.0_booklet_2025_PRINT.pdf)
- [Clockstar 2.0 schematic PDF, internal v2.4](https://cdn.shopify.com/s/files/1/0552/3269/2430/files/Clockstar_2.0_schema.pdf)
- [CircuitBlocks online editor — sign-in required](https://code.circuitmess.com/)
- [Clockstar v2 firmware and build instructions](https://github.com/CircuitMess/Clockstar-v2-Firmware)
- [Clockstar v2 firmware v1.3 release](https://github.com/CircuitMess/Clockstar-v2-Firmware/releases/tag/v1.3)

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Source: gadgets.sh · https://gadgets.sh/devices/clockstar-2-0/ · JSON: https://gadgets.sh/api/v1/devices/clockstar-2-0.json