MG-5 / vfd-clock-hardware

Hardware for controlling six VFD IV-17 tubes as clock (HH:MM:SS)

nixie-clock-hardware

Hardware for controlling six VFD IV-17 and two VFD IV-1 tubes as clock (HH:MM:SS)

Requirements for rev 1.0

• efficient step-boost converter up to 50V
• multiplexing
• control syncronous addressable LEDs
• PWM control
• I²C interface
• connector for ESP (UART)
• time syncronisation line for every second

Known issues in rev 1.0

• octal buffer for PWM use seems do not works for dimming
  • workaround: dimming solved by adding turn-off points in mulitplexing routine
• SPI is not suitable for controlling 20-bit shift register
  • cut traces and wire up to another pins

Pictures (rev 1.0)