My thinking is to create modular units, a display controller with 4 inputs to display the three axis and RPM. It should be small and later connect to Linux CNC
Displays
Pollin WDC2704
Pollin Hyundai HP12542R-DYO
TM1638
https://github.com/rjbatista/tm1638-library
Quadrature encoder
HCTL2000
Attiny2313
https://github.com/usedbytes/i2c_encoder
VFD Contol
https://wapl.es/cnc/2015/12/04/huanyang-linuxcnc-2.7-speed-control.html
The Arduino nano does not have enough pins to address 4 Quadrature counter IC's, IO expander Atmega32 or 8255?
http://www.torretje.nl/files/p8255optim.ino
Decide on a bus RS232? I2C?
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