CNCshield Squaring

References: CNC shield V1.9 schematic: [1]

CNC shield provides support for squaring via 2nd MEAG2560 pro mini device. I used an alternative approach, by using Arduino Nano, which is inserted between CNC shield and the CNC mill. The arduino Nano simply converts 4 input signals:

• PC0/A0: MEGA2560_STEP X1: puls signal, which controls pulses for stepper-driver for X-movement. Connected to U14.12
• PC1/A1: DIR X1: dir signal, which controls the direction for stepper-driver for x-movement. Connected to U14.5
• PC2/A2: ESX1: endstop signal of X1 axis
• PC2/A2: ESX2: endstop signal of X2 axis

To 3 output signals:

• PB0/D8: DRIVER STEP X1