BOB (Break Out Board) Vendors



One of the questions we are asked the most, is "Which BOB do you recommend?"  Since we don't want to play favorites, we are listing each category alphabetically by vendor, but it will be all of the BOBs we know of.  Please keep in mind that we are not endorsing any particular BOBs, but rather letting you know which ones we know of. 

We are linking to the Vendor's home or landing pages, and their specific product pages.  However, we have no control over what they say, do, or claim there; you will be at external sites.

Here is our FAQ page for the other common questions about BOBs.


General Purpose BOBs





A Florida based manufacturer of quality CNC parts.

  • C6   - Variable Speed Control Board (Step Signals)


  • C10   - Bidirectional Parallel Port Interface Card (Screw Terminals)


  • C10S - Bidirectional Parallel Port Interface Card (Push Lock Terminals) 


  • C11  - Multi-function CNC Board (Screw Terminals)


  • C11GS - Multi-function CNC Board (Push Lock Terminals)


  • C13 - Basic Breakout Board


  • C25 - Dual Port SmoothStepper Board(Screw Terminals)


  • C25S - Dual Port SmoothStepper Board(Push Lock Terminals)





  • C32S - Dual Port Multi-function CNC Board


  • C41 - PWM Variable Speed Control Board


  • C52 - ESS Third Port Expansion Board  


  • C53 - ESS Third Port Expansion Board for Encoders


  • C62 - Dual Port Multi-function Board





HobbyCNC: On the Linked page, click on the learn more button! 

HobbyCNC logo


  •  HobbyCNC PRO 4-Axis Board  Control 3 or 4 stepper motors from your computers printer port! Ideal For Desktop Machining and Robots! Control Routers, Lathes, Mills, PCB Drillers, and Engravers! Just About Anything!


  •  HobbyCNC EZ Board Control 3 stepper motors from your computers printer port! Ideal For Desktop Machining and Robots! DIY CNC Routers, DIY CNC Lathes, Mills, PCB Drillers, and Engravers! Just About Anything!
    EZ Board




Homann Designs

Homann Designs

Located in Australia






Products for CNC and motion control applications since 1998. Design, manufacturing, and support based in the USA.

  • PMDX-126 The PMDX-126 is an isolated breakout board with support for 9 inputs, 16 outputs, and an interface (via optional PMDX-107) for controlling a VFD.  It is recommended that the ESS use a 5V power supply separate from that of the PMDX-126 (and the ESS should not power the PMDX-126). The internal power supply in the PMDX-126 cannot run any other accessories if you power the ESS from it.
    PMDX 126





Weerasak: Located in Thailand 



  • The MB2 is an Industrial environment BOB, featuring: 6 Axis Line driver; I/O that utilizes all 3 ports of the ESS; OSSD safety output; Status LEDs for all signals; Requires a single 24V power supply.   Support LinkProduct Manual in English.




CNC Technics Located in Germany

CNC Technics



Technical specifications:

* ESS SmoothStepper connector + 5V   * 3 Relay Outputs up to 230V/5A   * 2 Relay Outputs for Spindle CW/CCW   * all inputs and outputs are protected by optocouplers   * All inputs from 5-24V z.b. Limit switch, tool length measurement   * All outputs from 5-24V   * Port1: 5 Inputs   * Port2: 4 Outputs or 13 Inputs   * Port3: 12 Outputs or 13 Inputs   * 6 Axes Outputs XYZABC mit 10MHz optocouplers   * PWM Output for Spindle 0-10V oder 0-5V   * Charge Pump Watchdog  12.5kHz   * 5V Output with max 500mA   * external emergency stop for board shutdown   * Status display over LED   * Power Supply Input 16-37V   * 147x245mm

Break Out Board Manual 










 The HG08 allows for 5 axes, a Relay and 4 limit switches.  Here is its manual.



Stepper Online:




This ST-V2 board uses a 74HC244 logic chip that drives 6 mA. This should work for most motor drivers, but not necessarily ALL motor drivers! You will need to check the motor driver specs to know for sure.

You MUST USE THE USB cable to supply 5V to this board, otherwise the motor outputs WILL NOT WORK!  (You should be able to cut a USB cable and connect its PWR and GND wires to the +5v and GND used to feed your ESS.  This will let you power the ST-V2 without having to connect it to the PC - preserving your electrical isolation from your PC.)

You will need a FEMALE LPH26-to-DB25 FEMALE ribbon cable to connect this board to one of the ESS ports.

If you are feeding it 12V in the 12V / 24V input, you may or may not have enough voltage headroom to drive your Spindle 0-10V signal all the way up to 10V. You may need to use a higher supply voltage (up to 24V) to get all the way up to 10V on the Spindle Output.

Notes: Pins 2-9 are not bidirectional so they will always be outputs.


Mach3 Profile and files for use with the ESS

Mach4 Profile and files for use with the ESS

5 Axis MACH3 CNC Breakout Board Interface for Stepper Motor Driver. 
Brand: StepperOnline
UPC: 0705701867036
Model: US056






We DO NOT recommend this NO NAME BOB, since there is no information or documentation we can find about it other than a picture which lists the silk screen pin names.  (Right click on the image and click view image to see a larger version of it.)


Motor Driver Boards with Parallel Port connector




Gecko Drive


A California based manufacturer of Motor Drivers.  They have many more products than we are listing.



G540 - 4-Axis Digital Step Drive, PWM to 0-10VDC VFD output, E-Stop input, 4 inputs for switches, 2 relay outputs

To connect a SmoothStepper to a G540, you need a ribbon cable with a Female LDH26 end (ESS) and a Male DB25 end.
On our order page, it would be one of these FEMALE LPH26-to-DB25 MALE ribbon cables:

  • 13 inch long(C-P26DB25M-R)
  • 14 inch long (C-P26DB25M-L)

Otherwise if you already have a Female DB25 ended cable, you could use a Male DB25-to-DB25 Male Gender Changer which is at the bottom of our Order page.












 They have lots of Stepper drivers, more than we will list here.

  • MX4660 is a 4 axis driver.  Please use a ribbon cable to connect the SmoothStepper to the MX4660's CN1: DB25 header, which will allow you to control the motors.  DO NOT CONNECT the SmoothStepper to the MX4660's CN10: 26 pin header, it does not have motor signal inputs.     The CN10 is an expansion port for the 4th axis.





THC (Torch Height Controller)

Texas MicroCircuits

Texas Microcircuits Logo


The TMC3in1 is a Torch Height Controller (THC) that also gives you a 5 axis breakout board and spindle controller.  It only works in Mach3 for the moment, and Mach4 support is under active development for an early 2018 release.  Spindle support is almost ready for release.




This section woefully under represents the number of Pendants out there.  Pleas let us know of ones we should add.



  • XBox controller.  If you have an XBox controller, you can use it with a Mach3 plugin or a Mach4 plugin.


  • VistaCNC
    • VistaCNC P1A pendant:  It works in Mach4, but has no config or diagnostic windows at the moment. Their development team is working on it as of October 2017.




Spindle Only Control Boards






How Do I Get My BOB Listed?

If you are a BOB vendor or manufacturer we will gladly add you to the list, just This email address is being protected from spambots. You need JavaScript enabled to view it. us with these details.

1) Your company name, company logo (up to 500 pixels wide by 100 pixels tall), a company webpage you want your logo to link to, and a short description about your company.   The page you want us to link to will be on your site, and you can update it as you wish.

2) For each BOB product (not connectors or miscellaneous add-ons, but for each individual BOB) list the following:

  • Category (General Purpose, Torch Height Control, VFD controller, etc..)  (We have already listed a few categories on this page, but we are open to a few new categories).
  • Model Number or Name
  • Product Web Page (that the Model Number or Name will link to).
  • Product image
  • A short one sentence description about its features.




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