SainSmart RAMPS1.4 3D Control Board

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Pre-Flight Check

If you think you may have mistakes you can install only one stepper driver during initial testing and risk only one stepper driver.

The trimpot on the stepper drivers controls the current limit. Turn it all the way down (counter clock wise) and back up 25%. Be careful to not force the trimpot, it is delicate. You will need to fine tune the current limit later. Note that it is allways giving the motors that much power, even when not moving, so if your stepper motor drivers are getting hot, you may want to turn it down slightly.

Connect the minimum endstops for X,Y, and Z

Connect Motors (Do not disconnect or connect motors while powered; if the connection is loose, this will cause the motors to spazz and possibly kill your stepper driver.)

You may want to use this code to test all the electronics before installing any of the suggested firmwares.

Install firmware (More info below). Firmware flashing can be done without 12V power supply connected.


It is relatively simple to wire up the RAMPS. Just add the extruder heating coil wire to D10, the thermistor to the two T0 pins on middle right right, and wire up the steppers and endstops. From left to right, wire all of the stepper motor's wires as red, blue, green, and black or red, green, yellow, blue into the pins next to the Pololus. When you connect the wires to the endstops (if you are using 3 endstops, plug them into the MIN (-) slots), make sure you match the labels.


Note that tesla & tonok firmware use d9 and sprinter and johnny/tonok use d10 for the extruder hot end.


Reversing +/- or otherwise incorrectly connecting power can destroy your electronics and cause fire hazard.

Incorrectly inserting stepper drivers will destroy your electronics and cause a fire risk. Always make sure power and USB is disconnected when removing or adjusting stepper drivers. Always make sure to insert drivers in correct orientation and in the socket correctly.

The endstop pins are Signal - GND - VCC, instead of the VCC - Sig - GND like the rest of RepRaps boards. Make sure to wire them correctly. This is done to allow squeezing fatter traces on the printable board.

Connecting Power

Connect your 12V power supply to the RAMPS shield. Reversing +/- or otherwise incorrectly connecting power can destroy your electronics and cause fire hazard.

The bottom pair of connectors marked 5A power the stepper drivers and Extruder heater/fan (D9, D10). The source should be rated a minimum of 5A.

The pair of connectors above marked 11A power a Heated Bed, or other output (D8). The source should be rated a minimum 11A (if both power rails are connected to the same supply it should have a minimum rating of 16A).

The barrel connector, on the Arduino MEGA, will NOT power RAMPS and will not provide power to the stepper motors, heated bed, etc.

The power connector plug may not be obviously labeled, looking at the power connection the positive is on the left and the negative is on the right of the plug.

Power Supply

Where to find the D1 diode (note that D2 is shown at the left, not D1)

RAMPS is quite happy with the 12 V line from PCPowerSupply. Or you can hack up a 12V laptop power supply, or other 12 V "wall wart" power supply. Be sure that the power can output 5A or greater. Additional 11A may be needed for heated bed support.

See Connecting power above.

The 3 pins next to the reset switch are meant to optionally connect to your PSU.

The PS_ON pin is intended to switch your power supply on and off. Many firmwares support pulling this pin low with M80 command to turn the power supply on, and M81 to turn it off. This behavior is desired for ATX power supplies and can be modified in firmware to support 5V high power supplies like those borrowed from an Xbox.

Without D1 installed, or when the 12VIN is not connected, the Arduino gets its power from USB. If you want your kit powered without USB connected you need to solder in D1 OR connect VCC to your PSU.

The VCC pin can be connected to your ATX's 5Vsb to continuously power the Arduino from your ATX power supply. You will want to make sure that D1 is not installed or cut out. The Arduino is not designed to be powered directly on the VCC rail and the VIN pin at the same time.

The 5V pin in that connector on RAMPS only supplies the 5V to the auxiliary servo connectors. It is designed so that you can jumper it to the VCC pin and use the Arduino's power supply to supply 5V for extra servos if you are only powered from USB or 5V. Since there is not a lot of extra power from the Arduino's power supply you can connect it directly to your 5V power supply if you have one. You can also leave this pin not connected if you have no plan to add extra servos.

Maximum Input Voltage

Power Supply without diode

The 1N4004 diode connects the RAMPS input voltage to the MEGA. If your board does not have this diode soldered in, you can safely input as much as 35V. (The pololus can do up to 35V)

Power Supply with diode

If your board has a 1N4004 diode soldered in, do not apply more than 12 V to it. Original flavor Arduino Mega are rated to 12 V input. While Arduino Mega 2560 can take 20 V, it is not recommended.

Firmware and Pin Assignments

RAMPS 1.4 uses the same pin definitions as 1.3.

You will need the Arduino software at to upload the firmware to Arduino Mega. Arduino MEGA 2560 Rev3 requires Arduino software version 0023.

Sprinter and Marlin are popular and stable firmwares for RAMPS as of 3/28/2012. Pronterface is a cross platform printer control program that can be used for testing/printing.

Working preconfigured sprinter firmware can be downloaded at . Mechanical is in the folder ending with ME, optical endstop firmware is in the folder ending in OE.

Working preconfigured Marlin firmware can be downloaded at . is for mecanical endstops, for optical endstop need to reverse the logic of endstops from the configuration.h shell, the language of display is in italian, but can easy be canged from the shell language.h

Others (Need pins set in Firmware as below):

  • mechanical endstops (now the default option) require #define OPTO_PULLUPS_INTERNAL 1 to be added to configuration.h if not there by default.

Here are the pin definitions for this board.

// For RAMPS 1.4
#define X_STEP_PIN         54
#define X_DIR_PIN          55
#define X_ENABLE_PIN       38
#define X_MIN_PIN           3
#define X_MAX_PIN           2

#define Y_STEP_PIN         60
#define Y_DIR_PIN          61
#define Y_ENABLE_PIN       56
#define Y_MIN_PIN          14
#define Y_MAX_PIN          15

#define Z_STEP_PIN         46
#define Z_DIR_PIN          48
#define Z_ENABLE_PIN       62
#define Z_MIN_PIN          18
#define Z_MAX_PIN          19

#define E_STEP_PIN         26
#define E_DIR_PIN          28
#define E_ENABLE_PIN       24

#define SDPOWER            -1
#define SDSS               53
#define LED_PIN            13

#define FAN_PIN            9

#define PS_ON_PIN          12
#define KILL_PIN           -1

#define HEATER_0_PIN       10
#define HEATER_1_PIN       8
#define TEMP_0_PIN          13   // ANALOG NUMBERING
#define TEMP_1_PIN          14   // ANALOG NUMBERING


FILE ID# TYPE DESCRIPTION DOWNLOAD Eagle Files These are the files you need to make the board.(Use the File: link to the left to access older versions of the file.)
File:RepRapjr.lbr Eagle Libraries The components used in this board are here. see Eagle_Library media:RepRapjr.lbr

Bill of Materials

ID Description Quantity Part Number Reichelt Order Number Digikey Part Number (Description)
U1 Arduino Mega 1 2560 or 1280 1050-1018-ND(BOARD MCU MEGA2560)
U2,U3,U4,U5 Pololu stepper driver boards 4 A fifth one can be used for a 2nd extruder or extra axis N/A
C2 100nF capacitor (0805)(> highest planned voltage) 1 311-1141-1-ND(CAP CER 0.1UF 25V 10% X7R 0805)
C1,C5,C8 10uF capacitor (153CLV-0405)(>5V) 3 399-6724-1-ND(CAP ALUM 10UF 25V 20% SMD)
C3,C4,C6,C7,C9,C10 100uF capacitor (153CLV-0605)(> highest planned voltage) 6 399-6726-1-ND(CAP ALUM 100UF 16V 20% SMD)
R1,R7,R11,R21,R22 4.7K resistor (0805)(1%) 5 RHM4.70KAECT-ND(RES 4.70K OHM .4W 1% 0805)
R2,R3,R4,R5,R6,R8,R9,R10 100K resistor (0805) 8 RHM100KAECT-ND(RES 100K OHM .4W 1% 0805)
R12 1K resistor (0805) 1 RHM1.00KAECT-ND(RES 1.00K OHM .4W 1% 0805)
R23,R24,R25 1.8K resistor (0805) 3 311-1.80KCRCT-ND(RES 1.80K OHM 1/8W 1% 0805)
R16,R17,R18,R19,R20 10K resistor (0805) 5 P10.0KCCT-ND(RES 10.0K OHM 1/8W 1% 0805)
R13,R14,R15 10 ohm resistor (0805) 3 541-10.0TCT-ND(RES 10.0 OHM .33W 1% 0805)
Q1,Q2,Q3 N-channel Mosfet 3 STP55NF06L ZXM 64N035 L3 497-6742-5-ND (MOSFET N-CH 60V 55A TO-220)
D1,D2 Diode 2 1N4004 1N 4004 1N4004FSCT-ND (DIODE GEN PURPOSE 400V 1A DO41)
F1 PTC resettable fuse (30V, Hold5A, Trip10A) 1 MF-R500 PFRA 500 MF-R500-ND (FUSE PTC RESETTABLE 5A HOLD)
F2 PTC resettable fuse (Hold11A) 1 MF-R1100 RGEF1100-ND (POLYSWITCH RGE SERIES 11.0A HOLD)
J2 D8-D10 Outputs // 6 position screw terminal (min 11A per contact) OR Jack/Plug connector pair 1 282837-6 AKL 101-06 WM7857-ND (CONN TERMINAL BLOCK 6POS 5.08MM)
Alternative: 1x 609-4284-ND & 1x 609-4218-ND. May prevent overtemp events
LED1 Green LED (0805) 1 L62505CT-ND(LED GREEN DIFF 0805 SMD)
LED2,LED3,LED4 Red LED (0805) 3 L62501CT-ND(LED HI EFF RED DIFF 0805)
S1 Push button switch 1 B3F-3100 TASTER 3305B (should fit footprint also, but button will overhang board edge) 450-1648-ND (SWITCH TACT RA H=6.35MM)
X1 Power jack (Plug and fixed receptacle)(Min 11A per position more is better) 1 MSTBA 2,5 and MSTBT 2,5 (5.04mm spacing 4 connector) WM7847-ND (CONN HEADER 4POS 5.08MM R/A TIN) & WM7953-ND (CONN TERM BLOCK 4POS 5.08MM R/A)
2 x 3 pin header 8 961206-6404-AR 3M9459-ND (CONN HEADER VERT DUAL 6POS GOLD)
4 pin header 5 961104-6404-AR SL 1X36G 2,54 (3 of these) 3M9449-ND (CONN HEADER VERT SGL 4POS GOLD)
6 pin header 2 (? - from 961106-6404-AR 3M9451-ND (CONN HEADER VERT SGL 6POS GOLD)
2 x 18 Pin Stackable Female Header (non stackables can be used with plated through holes) 1 MALE: SL 2X25G 2,54 (2 of them, shortened with a saw or pliers) S7121-ND (CONN HEADER FMAL 36PS.1" DL GOLD) - Not Stackable
8 Pin Stackable Female Header (non stackables can be used with plated through holes) 5 S7041-ND (CONN HEADER FEMALE 8POS .1" GOLD) - Not Stackable
6 Pin Stackable Female Header (non stackables can be used with plated through holes) 1 S7039-ND (CONN HEADER FEMALE 6POS .1" GOLD) - Not Stackable
24 Pin Female Header * Note * 2 Required to carry enough current for motors S7057-ND (CONN HEADER FMALE 24POS .1" GOLD) - Rated @ 3A / Pin
8 Pin Female Header * Note * 4 Required to carry enough current for motors S7041-ND (CONN HEADER FEMALE 8POS .1" GOLD) - Rated @ 3A / Pin
0.1" Jumpers 15 A26242-ND (SHUNT LP W/HANDLE 2 POS 30AU)
Circuit Board 1 v1.4 N/A

Note * You can use Female Headers which are not the exact size, but they are hard to break/cut so in this case buy some extra! (one wasted header per cut)

A BOM for sourcing the RAMPS components from Mouser is also available in this google spreadsheet (This list is incomplete and has missing or incorrect quantities.)

Shopping lists for v1.4 [1] .