Callisto is a digital clock that uses a Russian IV-18 vacuum fluorescent tube for the display. The clock uses an ESP32 to automatically sync time.
The name Callisto was chosen so that the name could be displayed on an 8-digit seven-segment display.
- Sync time, retrieved using WiFi
- Automatically switch to daylight saving time
- Clock display settings configured using web browser
- Automatic shutoff during night hours in order to decrease energy usage and extend tube life
- Auto-dimming based on ambient light conditions
The software and hardware design of the clock was stolen from heavily inspired by the following projects: