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

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