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LinuxCNC Shield for OrangePi

This repo contains a HW design files for OrangePi CNC shield for making the OrangePi a LinuxCNC machine.

The allwincnc project can be used to do the realtime heavy lifting (stepper control) while the OrangePi does the slower tasks (kinematics calculations,...).

More details about making this all work with a real CNC machine can be found on my blog

shield

Features

  • 5 stepper controllers (direction and step signals) supported
  • 3 encoders inputs
  • Spindle control - both PWM and 0-10 V outputs
  • 6 limit switches (endstops, home position,...)
  • Probe sensor input
  • Stop button input
  • 2 power outputs (cooling, ESTOP,...), up to 24 V
  • Incidator leds on inputs and outputs for easier debugging
  • Up to 15 V inputs protection
  • Selectable 3.3/5 V power for limit switches
  • OrangePi can be powered directly from the board (dedicated 5 V input) and vice versa.

Connectors

J21 Steppers

Pin Signal
1 GND
2 ~Enable
3 Y2 dir
4 Y2 step
5 X2 dir
6 X2 step
7 Z dir
8 Z step
9 Y dir
10 Y step
11 X dir
12 X step

J15 spindle

Pin Signal
1 GND
2 0-10 V
3 PWM

J11, J12, J13 Encoders

Pin Signal
1 GND
2 B
3 A
4 5 V

J1-J7 Inputs

Pin Signal
1 5/3.3 V
2 GND
3 signal (with pull-up)

OrangePi Pinout

Steppers

X Y Z X2 Y2
Step PA0 PA12 PA13 PC4 PA14
Dir PA6 PA1 PA11 PD14 PC7

Encoders

X Y Z
A PA8 PA18 PC2
B PA9 PG9 PA21

Limit switches

Xmin Ymin Zmin X2min Y2min Limits
PA2 PC1 PA19 PA7 PG8 PC3

Others

Enable Spindle Cooling Probe ESTOP in ESTOP out
PA3 PC0 PG7 PA10 PA20 PG6