Pin Number Pin Name Arduino Pin Name RAMBO Function
1 PG5 ( OC0B ) Digital pin 4 (PWM) PWM-Ext 6
2 PE0 ( RXD0/PCINT8 ) Digital pin 0 (PWM) (RX0) USB – serial comms, SER0 3
3 PE1 ( TXD0 ) Digital pin 1 (PWM) (TX0) USB – serial comms, SER0 4
4 PE2 ( XCK0/AIN0 ) Ext2 20
5 PE3 ( OC3A/AIN1 ) Digital pin 5 (PWM) PWM-Ext 5
6 PE4 ( OC3B/INT4 ) Digital pin 2 (PWM) PWM-Ext 4
7 PE5 ( OC3C/INT5 ) Digital pin 3 (PWM) Bed Heater
8 PE6 ( T3/INT6 ) Ext2 18
9 PE7 ( CLKO/ICP3/INT7 ) Ext2 16
10 VCC VCC VCC
11 GND GND GND
12 PH0 ( RXD2 ) Digital pin 17 (PWM) (RX2) Serial 7
13 PH1 ( TXD2 ) Digital pin 16 (PWM) (TX2) Serial 8
14 PH2 ( XCK2 ) Ext2 8
15 PH3 ( OC4A ) Digital pin 6 (PWM) Fan 1
16 PH4 ( OC4B ) Digital pin 7 (PWM) Heat 1
17 PH5 ( OC4C ) Digital pin 8 (PWM) Fan 0
18 PH6 ( OC2B ) Digital pin 9 (PWM) Heat 0
19 PB0 ( SS/PCINT0 ) Digital pin 53 (PWM)(SPI-SS) SPI-Ext SS 6
20 PB1 ( SCK/PCINT1 ) Digital pin 52 (PWM)(SCK) SPI-Ext SCK 5
21 PB2 ( MOSI/PCINT2 ) Digital pin 51 (PWM)(MOSI) SPI-Ext MOSI 4
22 PB3 ( MISO/PCINT3 ) Digital pin 50(MISO) SPI-Ext MISO 3
23 PB4 ( OC2A/PCINT4 ) Digital pin 10 (PWM) Z Min Endstop
24 PB5 ( OC1A/PCINT5 ) Digital pin 11 (PWM) Y Min Endstop
25 PB6 ( OC1B/PCINT6 ) Digital pin 12 (PWM) X Min Endstop
26 PB7 ( OC0A/OC1C/PCINT7 ) Digital pin 13 (PWM) LED, PWM-Ext 3
27 PH7 ( T4 ) Ext2 6
28 PG3 ( TOSC2 ) Ext3 7
29 PG4 ( TOSC1 ) Ext3 5
30 RESET RESET Reset
31 VCC VCC VCC
32 GND GND GND
33 XTAL2 XTAL2 XTAL2
34 XTAL1 XTAL1 XTAL1
35 PL0 ( ICP4 ) Digital pin 49 Y Direction
36 PL1 ( ICP5 ) Digital pin 48 X Direction
37 PL2 ( T5 ) Digital pin 47 Z Direction
38 PL3 ( OC5A ) Digital pin 46 (PWM) MX3-5 Direction
39 PL4 ( OC5B ) Digital pin 45 (PWM) MX2-5 Direction
40 PL5 ( OC5C ) Digital pin 44 (PWM) MX1-5 Direction
41 PL6 Digital pin 43 E0 Direction
42 PL7 Digital pin 42 E1 Direction
43 PD0 ( SCL/INT0 ) Digital pin 21 (SCL) I2C SCL
44 PD1 ( SDA/INT1 ) Digital pin 20 (SDA) I2C SDA
45 PD2 ( RXDI/INT2 ) Digital pin 19 (RX1) Serial 5
46 PD3 ( TXD1/INT3 ) Digital pin 18 (TX1) Serial 6
47 PD4 ( ICP1 ) Ext2 14
48 PD5 ( XCK1 ) Ext2 12
49 PD6 ( T1 ) Ext2 10
50 PD7 ( T0 ) Digital pin 38 Digipot SS
51 PG0 ( WR ) Digital pin 41 X Microstep2
52 PG1 ( RD ) Digital pin 40 X Microstep1
53 PC0 ( A8 ) Digital pin 37 X Step
54 PC1 ( A9 ) Digital pin 36 Y Step
55 PC2 ( A10 ) Digital pin 35 Z Step
56 PC3 ( A11 ) Digital pin 34 E0 Step
57 PC4 ( A12 ) Digital pin 33 E1 Step
58 PC5 ( A13 ) Digital pin 32 MX1-4 Step
59 PC6 ( A14 ) Digital pin 31 MX2-4 Step
60 PC7 ( A15 ) Digital pin 30 Z Max, MX3-4 Step
61 VCC VCC VCC
62 GND GND GND
63 PJ0 ( RXD3/PCINT9 ) Digital pin 15 (RX3) Serial 9
64 PJ1 ( TXD3/PCINT10 ) Digital pin 14 (TX3) Serial 10
65 PJ2 ( XCK3/PCINT11 ) Ext2 9
66 PJ3 ( PCINT12 ) Ext2 11
67 PJ4 ( PCINT13 ) Ext2 15
68 PJ5 ( PCINT14 ) Ext2 17
69 PJ6 ( PCINT 15 ) Ext2 19
70 PG2 ( ALE ) Digital pin 39 Y Microstep2
71 PA7 ( AD7 ) Digital pin 29 X Enable
72 PA6 ( AD6 ) Digital pin 28 Y Enable
73 PA5 ( AD5 ) Digital pin 27 Z Enable
74 PA4 ( AD4 ) Digital pin 26 E0 Enable
75 PA3 ( AD3 ) Digital pin 25 E1 Enable
76 PA2 ( AD2 ) Digital pin 24 X Max, MX3-3 Enable
77 PA1 ( AD1 ) Digital pin 23 Y Max, MX2-3 Enable
78 PA0 ( AD0 ) Digital pin 22 MX1-3 Enable
79 PJ7 Ext2 13
80 VCC VCC VCC
81 GND GND GND
82 PK7 ( ADC15/PCINT23 ) Analog pin 15 Y Microstep1
83 PK6 ( ADC14/PCINT22 ) Analog pin 14 Z Microstep1
84 PK5 ( ADC13/PCINT21 ) Analog pin 13 Z Microstep2
85 PK4 ( ADC12/PCINT20 ) Analog pin 12 E0 Microstep2
86 PK3 ( ADC11/PCINT19 ) Analog pin 11 E0 Microstep1
87 PK2 ( ADC10/PCINT18 ) Analog pin 10 E1 Microstep2
88 PK1 ( ADC9/PCINT17 ) Analog pin 9 E1 Microstep1
89 PK0 ( ADC8/PCINT16 ) Analog pin 8 Analog-Ext 1
90 PF7 ( ADC7/PCINT15 ) Analog pin 7 Thermistor 3, Analog-Ext 2
91 PF6 ( ADC6/PCINT14 ) Analog pin 6 Analog-Ext 3
92 PF5 ( ADC5/TMS ) Analog pin 5 Analog-Ext 4
93 PF4 ( ADC4/TMK ) Analog pin 4 Analog-Ext 5
94 PF3 ( ADC3 ) Analog pin 3 Analog-Ext 6
95 PF2 ( ADC2 ) Analog pin 2 Thermistor 2
96 PF1 ( ADC1 ) Analog pin 1 Thermistor 1
97 PF0 ( ADC0 ) Analog pin 0 Thermistor 0
98 AREF Analog Reference
99 GND GND GND
100 AVCC VCC VCC