exixe: Low-cost miniature driver module for Nixie tubes

exixe is a driver module for IN-12 and IN-14 Nixie tubes, I developed them while building my own Nixie clock.

Features

Compared to the traditional approach, exixe board offers significant advantages:

Small and modular

• 2x4 cm (0.79x1.57 inches)
• Breadboard friendly
• Easy integration

Low-cost

• $3 in components
• No need for obscure vintage driver chips

SPI interface

• High speed, up to 24MHz SCLK
• Available on virtually all embedded systems including Arduino and Raspberry Pi
• Simple 16-byte command packet

Advanced control

• Powered by ARM Cortex uC
• Hardware PWM on all cathodes for smooth dimming and animations
• Overdrive feature for poisoned cathodes

RGB backlight

• ...well because RGB

No multiplexing

• Brighter display
• Longer tube life

Technical details

tube needs...

over drive...

stm32f042k6t6, 32 pin, enough pin... timer pwm channels

SPI command protocol

Clock polarity

exixe expects a fixed 16-byte command, which should be