M5DIAL Color CountDown Timer

日本語はこちら

A visual countdown timer sketch for M5Dial with a segmented ring UI.

Photos

Features

• 20-segment visual ring timer
• Fast encoder handling (multi-step minute changes)
• Catch-up tick logic for better time accuracy under load
• Half-time notification with selectable sound pattern
• Non-blocking completion alarm sequence
• Optional auto-dim while in DONE state
• Optional auto-reset after DONE timeout
• Long-press mute toggle in READY state
• Persist last configured duration in NVS and restore on boot
• Optional preset stepping (5/15/25/50 minutes)

Controls

• Rotate: set time (READY/PAUSED)
• Short press:
  • READY -> start
  • RUNNING -> pause
  • PAUSED -> resume
  • DONE -> reset
• Long press:
  • READY -> toggle mute (when ENABLE_LONG_PRESS_MUTE_TOGGLE is enabled)
  • Other states -> reset

Demo Video

Configuration

Edit config.h. Key options include:

• HALF_NOTIFY_PATTERN
• USE_PRESET_STEPS
• PERSIST_LAST_DURATION
• MUTE_MODE_DEFAULT
• DONE_DIM_START_MS, DONE_DIM_EVERY_MS, DONE_DIM_STEP, DONE_MIN_BRIGHTNESS
• DONE_AUTO_RESET_MS

Using config.example.h

Recommended workflow for sharing/reuse:

1. Copy config.example.h to config.h
2. Adjust values in config.h for your device/use case
3. Optionally keep config.h out of version control

License

This project is licensed under the MIT License.

• Copyright: 2026 omiya-bonsai
• Details: LICENSE