VFD Clock | Offline Timekeeping | Desktop Decoration

VFD-Clock Source Code and Firmware Introduction
Based on STM32F103C8T6 and FreeRTOS: This is a VFD clock based on STM32F103C8T6 and FreeRTOS, using fluorescent tubes to indicate the time. It runs completely offline with an annual error of less than 1 minute. User Guide: Solder the PCB , use STM32CubeProgrammer to burn the pre-compiled program, connect via USB, and use a time synchronization tool to synchronize the computer time. Component purchases should refer to the schematic diagram; the BOM may be incorrect . Left and right buttons switch pages. Long press the left button to turn the RGB lights on/off; long press the right button to toggle display brightness (7 levels). Hardware: STM32F103C8T6 main controller, 7-BT-317NK fluorescent tube, WS2812-LED light, push-button switch, buzzer , switching power supply, 18650 lithium battery, DHT11 temperature and humidity sensor, DS3231 real-time clock. Software: VSCode EIDE, STM32CubeMX, STM32CubeProgrammer. The software is not yet fully complete; issue and PR submissions are welcome. Thanks to XACT for the negative voltage Cuk power supply design and to Saisaiwa for the VFD segment code driver code design.