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Model Railroad Control Systems

cpNode ProMini


cpNode ProMini

0.25 LBS
Calculated at checkout

Product Description

cpNode with onboard Arduino ProMini. The cpNode ProMini replaces cpNode 2.7 for new installations.

cpNodes provide input and output (I/O) ports which connect to LEDs for signals, push buttons, turnout motors, block detectors, and other devices to a central computer for controlling model railroads.  cpNodes may also be used as standalone controllers for staging, crossings and interlocking plants.

A cpNode has:
  • 16 I/O lines with solder pads for LED limiting resistors
  • Screw terminal blocks, male or female headers  or solder pads to connect external devices - see configurations below
  • CMRInet RS-422/485 Network Interface.  CMRInet is now NMRA Layout Control Specification S9-10
  • I2C interface for adding Input/Output Expander (IOX) boards for up to 128 additional i/o ports
  • All the i/o needed to control one end of a CTC siding, just add signals, detectors and switch motor drivers
  • Female headers to receive an Arduino ProMini (Sparkfun or DF Robot format).
  • I/O is configured in 8 bit groups, providing up to 144 lines when fully expanded with IOX16s and/or IOX32s
  • You can cpNodes as small, economical, CMRI nodes as is, or customize the code to support applications requiring local intelligence
  • Standard "Sketch" (Arduino program) is compatible with JMRI or traditional CMRI BASIC/Visual Basic development tools


  • The default configuration (AT) includes a ProMini and has screw terminals installed for the CMRInet and 0.100 screw terminals for the i/o, most users will want this option
  • The No Header (NH) option has screw terminals installed for the CMRInet and no i/o connectors so the user can install their 0.100 connectors of choice.  Contact us for a quote if you want custom assembly with your favorite connector)
  • No Processor option for those who want to supply their own Processor
  • Bare board if you want to build it up yourself

If you need a configuration which isn't listed, please contact us and we will be happy to quote you on a custom configuration

cpNode Kernel sketch for cpNode ProMini

CAD files and Bill of Materials for cpNode ProMini

Basic Assembly Instructions for cpNode ProMini



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