PWM 3 VCC 2 GND 1 GND 1 VCC 2 PWM 3 VCC GND ARDUINO MEGA 2560 R3 V1.0 COPY A0 00 A1 01 A2 02 A3 03 A4 04 A5 05 A6 06 A7 07 A8 08 A9 09 A10 010 A11 011 A12 012 A13 013 A14 014 A15 015 SCL 21 21 SDA 20 20 RX1 19 19 TX1 18 18 RX2 17 17 TX2 16 16 RX3 15 15 TX3 D14 14 RX0 > D0 0 TX0 < D1 1 D2 2 D3 3 D4 4 D5 5 D7 7 D8 8 D9 9 D10 10 D11 11 GND GND GND GND. 5V 5V 3V3 3.3V RESET RST IOREFF IOREF 24 24 AREF AREF GND GND.. D13 13 D12 12 Power Analog In PWM Communication 23 23 25 25 26 26 27 27 28 28 53 53 51 51 50 50 33 33 34 34 35 35 36 36 37 37 38 38 39 39 40 40 41 41 42 42 43 43 44 44 45 45 29 29 30 30 49 49 48 48 47 47 31 31 32 32 46 46 22 22 52 52 DIGITAL D6 6 Vin VIN ARDUINO MEGA 2560 VCC 5V.. 5V 5V. GND GND... GND GND.... LM2596TB-5.0 U2 Vin 1 Output 2 Ground 3 Feedback 4 ON/OFF 5 5VServo GND LM7805 U3 IN 1 GND 2 OUT 3 5VServo GND 1000u C1 B 1B A 1A A 2A B 2B NEMA17 B 1B A 1A A 2A B 2B NEMA17 DC_to_DC NEMA23 B 2B A 2A A 1A B 1B DM542 Microstep Driver PUL+ 1 PUL- 2 DIR+ 3 DIR- 4 ENA+ 5 ENA- 6 GND 7 +V 8 A+ 9 A- 10 B+ 11 B- 12 DM542 Microstep Driver VCC GND HDR-150 power Supply U5 V- 1 V- 2 V+ 3 V+ 4 HDR-150 V(input) 5 GND(input) 6 VCC_240V GND Wall Plug GND 9V 9V Arduino CNC Shield MCTR327 RESET 1 3.3V 2 5V 3 4 4 5 5 6 6 ABORT 7 HOLD 8 RESUME 9 COOLANT 10 A4 11 A5 12 13 13 14 14 SPINDLE-DIRECTION 15 SPINDLE-ENABLE 16 Z.LIM 17 Y.LIM 18 X.LIM 19 EN 20 Z.DIR 21 Y.DIR 22 X.DIR 23 Z.STP 24 Y.STP 25 X.STP 26 TX 27 RX 28 EN 76 M0 75 M1 74 M2 73 RST 72 SLP 71 STP 70 DIR 69 UM10T 68 GND 67 2B 66 1B 65 1A 64 2A 63 FLT 62 GND 61 EN 44 M0 43 M1 42 M2 41 RST 40 SLP 39 STP 38 DIR 37 UM10T 36 GND 35 2B 34 1B 33 1A 32 2A 31 FLT 30 GND 29 EN 60 M0 59 M1 58 M2 57 RST 56 SLP 55 STP 54 DIR 53 UM10T 52 GND 51 2B 50 1B 49 1A 48 2A 47 FLT 46 GND 45 GND 77 FLT 78 2A 79 1A 80 1B 81 2B 82 GND 83 UM10T 84 DIR 85 STP 86 SLP 87 RST 88 M2 89 M1 90 M0 91 EN 92 Voltage regulator Servo DS-S006L Servo MG996R X Z StepperConnector CNC MCTR327 U7 A+ 1 A- 2 B+ 3 B- 4 StepperConnector CNC MCTR327 U8 A+ 1 A- 2 B+ 3 B- 4 1B+ 1B- 1A+ 1A- 1A+ 1A- 1B+ 1B- 2A- 2A+ 2B- 2B+ 2B- 2B+ 2A- 2A+