Industrial control system (ICS) is a general term that encompasses several types of control systems and associated instrumentation used for industrial process control.

Such systems can range in size from a few modular panel-mounted controllers to large interconnected and interactive distributed control systems with many thousands of field connections. Systems receive data from remote sensors measuring process variables (PVs), compare the collected data with desired setpoints (SPs), and derive command functions which are used to control a process through the final control elements (FCEs), such as control valves.

Larger systems are usually implemented by supervisory control and data acquisition (SCADA) systems, or distributed control systems (DCS), and programmable logic controllers (PLCs), though SCADA and PLC systems are scalable down to small systems with few control loops. Such systems are extensively used in industries such as chemical processing, pulp and paper manufacture, power generation, oil and gas processing, and telecommunications.


Most devices require some internal logic or digital control. Most devices go about that in entirely incompatible ways. Can a single open inexpensive multipurpose controller replace most single-purpose machine control electronics?

potential functions

  • aiming solar panels
  • logging power input from mains, solar, wind, etc
  • logging power usage from batteries
  • maintaining comfortable internal temperature and humidity
  • maintaining hot water / refrigerated food
  • managing solar oven
  • managing internal lighting - individually addressable RGB LED strip allows for full light, night light, simulated sunrise/sunset, simulated lightning, etc.
  • managing compost
  • laundry?
  • dishes?
  • managing small indoor garden - light, watering, airflow, humidity - microcosm of all it's normal duties. Room for systems design reuse
  • interact with the wifi router / server / TV / workstation


We work hard to avoid depending on computers as much as possible - for example: Replimat projects can be drawn with pen and paper and the grids. Where we do depend on computers, we work hard to make sure they're as simple as possible, the same computer everywhere possible, that they run the same software everywhere possible.

Laser additions to open source Marlin 3D printer firmware for, OpenSLS, and mUVe3D demonstrate adaptability of existing ultra-low-cost 3D printing control solutions to a wider range of problems.

A collection of power, control, cooling, and container components are suggested, which connect the elements common to a variety of machine control problems, as well as additions to increase the range of acceptable input and output voltages. This allows the controller to consume power from a variety of solar panel and battery configurations, and to control peripherals originally designed for other applications (i.e. found, salvaged, or otherwise repurposed equipment).



Development targets:

  • Soldering iron attachment
  • Share inductors across HV, buck-boost, etc.
  • Printed power connector (PETG printed sprung m3 bolt (printed-in-place spring mechanism) and buna-n or ninjaflex O ring panel mount waterproof connector, crimp-on terminal connector for m3 bolt)

Battery charger


  • Hardening - IRFP260N mosfets - 50A 200V mosfets, Higher wattage supplies, smaller board, silicone potted


The replimat controller provides digital electronic control for all replimat projects. The controller works in conjunction with software and builds upon 3D printing and desktop fabrication to provide a generalized solution for machine control problems. The controller bolts to any frames and provides connections for motors, switches and sensors, pumps, lights, and other equipment.

Software assumes the presence of a microcontroller and an application processor capable of running Linux or another full OS.



This use of the controller includes 3D printing, plasma, waterjet, and laser cutting, milling and lathing as well as many other tasks automated with machine tools.

  • Firmware support for Emco CNC lathe w/ 6 axis tool changer and spindle speed control
  • Firmware support for Emco F1 CNC mill with quick-change tool post and 90 degree tiltable spindle for side-milling.
  • Firmware support for frame auto-drilling machine

Battery management

Current and voltage sense circuits, voltage and current control, as well as a calibrated load enable the controller to manage a wide variety of battery chemistries.

Home automation

ESP8266 integration allows for interaction with IoT devices.




Part Quantity Link
LCD 1 Amazon
2 wire extension cable 4 ebay
3 wire extention cable 6 ebay
4 wire extension cable 5 ebay
2 wire bare extension 2 Amazon
3 wire bare extension 2 Amazon
4 wire bare extension 2 Amazon
Pre-terminated cables w/ JST-XH lugs 1 Amazon
Controller case 1 CAD
LCD case 1 CAD


Summon FPGA tools
RepRapFirmware Wiki page
RepRapFirmware online configuration tool
LPC1768 port
building on Debian



Part Quantity Link
MKS Base 1 Amazon
LCD 1 Amazon
2 wire extension cable 4 ebay
3 wire extention cable 6 ebay
4 wire extension cable 5 ebay
2 wire bare extension 2 ebay
3 wire bare extension 2 ebay
4 wire bare extension 2 Amazon
Controller case 1 CAD
LCD case 1 CAD



Full installation instructions here.

  1. Download Octoprint from here
  2. Extract .img file
  3. Transfer .img file to SD card using etcher or "dd if=/path/to/file.img of=/path/to/sdcard/device bs=1M"
  4. edit wpa_supplicant.txt on SD card boot partition
  5. insert card into Raspberry Pi
  6. connect power source
  7. open web browser and connect to octopi.lan




Part Quantity Link
MKS Base 1 Amazon
LCD 1 Amazon
Controller plate 1 CAD
Extension cables 2


Laser Marlin


Pages in category "Controllers"

This category contains only the following page.