Monarco HAT
Industrial grade I/O board for the Single Board Computers

Create a PLC from your Single Board Computer, mount it on a DIN-rail and interface it with industrial sensors and devices directly. (I)IoT and Industry 4.0 ready, from prototyping to professional solutions.

Monitoring, archiving and control

The Monarco HAT is known to bring the best price to performance ratio in the following application areas:

  • Data acquisition (DAQ), data logging
  • Monitoring of machines and processes
  • Collecting data from legacy PLCs
  • (I)IoT gateway for legacy systems
  • Communication gateway (Modbus RTU/TCP,  OPC UA, MQTT, REST, SQL via ODBC etc.)
  • Universal PLC for non-critical applications
Raspberry Pi + Monarco HAT
The Monarco HAT has become an integral part of my toolbox for troubleshooting purposes in renewable energy and oil&gas automation. It gives me more freedom and possibilities than other way more expensive data loggers.
Kris SamoyOffshore services for oil&gas and renewable industries, Belgium
The product is well made and has been thought out well. The Monarco HAT is the best option to transform plain Raspberry Pi into a more industrial device.
Martin Omond-TongOmond-Tong Consultancy Ltd, United Kingdom
I am using Raspberry Pi 3 with the Monarco HAT to control a ground source heat pump with buffer combo which generates heat and hot water for our house. The Monarco HAT turns Raspberry Pi into a stable and reliable platform to implement long running control operations.
Jussi KantellFinland
OnTop Smart Manufacturing uses Monarco HAT (including Aluminium case for DIN-rail mounting) in plug-and-play IoT data loggers for its advanced and cost-effective Manufacturing Execution Systems (MES). See for more information.
Per JohnsenSweden

Monarco HAT in action

Analog and digital I/O, RS-485 and 1-Wire in compact enclosure

  • Power supply: 10-30 VDC
  • 4x digital input (24V tolerant)
  • 4x digital output (open-collector)
  • 2x analog input (0-10V, 0-20mA)
  • 2x analog output (0-10V)
  • 1x RS-485
  • 1x 1-Wire bus
  • 9 LED indicators
  • Battery-backed internal clock (RTC chip)
  • Hardware watchdog
  • Metal enclosure for DIN-rail mounting
  • High quality push-in terminals, detachable connector


Developing solutions with the Monarco HAT

It's the software which brings any hardware device to life. Use the Monarco HAT with the software platform of your choice.

Professional software

Our first choice for programming is REXYGEN, a family of software products for projects in automation, robotics, data acquisition, process control and feedback control in general.

REXYGEN offers a graphical development environment for programming the algorithms. You can use standard desktop or laptop PC. You create the algorithms from the so-called function blocks. The library includes countless items (timers, comparators, filters, PID controllers and many more).

Open source

open source initiative (OSI) logo
We understand the value of open source software and freedom of choice.
GitHub logo

GitHub repository

All the above mentioned Monarco HAT resources are available in public GitHub repository.

3rd party integrations

Programming with REXYGEN

  • Graphical programming without hand-coding
  • Industry-proven function blocks to use and re-use
  • User interface (HMI) for desktop, tablet and smartphone
  • Easy integration into business IT infrastructure (ERP/MES)
  • REST API for integration with virtually any system, framework or programming language
  • Up to 2 ms sampling rate with standard Raspbian distribution

Explore the Getting started guide for using the Monarco HAT with REXYGEN.

Monarco HAT turns your Single Board Computer into a versatile controller or data logging device

Automation Kit with Single Board Computer and REXYGEN Pro

Monarco HAT in enclosure for DIN rail mounting
  • In stock, shipping in 1-2 business days

449,- EUR

Automation Kit with Single Board Computer and

Monarco HAT in enclosure for DIN rail mounting
  • In stock, shipping in 1-2 business days

359,- EUR

Plain Monarco HAT with optional housing

Monarco HAT with wireframe of DIN rail enclosure
  • Monarco HAT
  • Detachable connector with push-in terminals
  • Metal spacers and screws
  • Optional: aluminium case for DIN rail mounting
  • Optional: cable for powering the official 7" Raspberry Pi display
  • Shipping worldwide
  • In stock, shipping in 1-2 business days

149,- EUR

Looking for a local Monarco HAT distributor?

Then check out the list of Monarco HAT resellers.

Frequently asked questions (FAQ)

Additional information about the Monarco HAT

What Single Board Computers are supported?

The Monarco HAT board works well with Raspberry Pi models B+, 2, 3, 3B+, 4 and ASUS Tinker Board S R2.0. The metal enclosure is available for all these computers.

Can I use multiple HATs with a one Single Board Computer?

No, HATs are not stackable by definition. A HAT has to have an EEPROM onboard that automatically configures it. This mechanism does not support stacking.

When will I receive my Monarco HAT?

We typically ship the Monarco HATs in 1-2 business days after your order is placed. Delivery time is about 3-5 business days within Europe and 10-12 days outside Europe.

What does 'HAT' mean?

A 'HAT' (Hardware Attached on Top) is an add-on board for Raspberry Pi that conforms to the HAT specification published by the Raspberry Pi Foundation.

Is the MCU of the Monarco HAT meant for running my own algorithms?

No, the internal MCU of the Monarco HAT only handles the input and output signals and communicates with the Single Board Computer, the one and only "brain" to run your algorithms.

How does the Monarco HAT communicate with the Single Board Computer?

Monarco HAT is connected via SPI and it also contains a few I2C devices onboard. RS-485 bus occupies the UART of the Single Board Computer but it can be disabled. See the full technical specification of the Monarco HAT and the Monarco HAT documentation on GitHub for details.

Can I still use the GPIO pins of the Single Board Computer?

Apart from SPI-0, UART, I2C-0 and I2C-1, the only GPIO pins occupied by the Monarco HAT are GPIO20, GPIO21 and GPIO26. You are free to use the remaining GPIO pins of the Single Board Computer. See the full technical specification of the Monarco HAT and the Monarco HAT documentation on GitHub for details.
  • Raspberry Pi is a trademark of the Raspberry Pi Foundation.
  • 1-Wire is a trademark of Maxim Integrated Products, Inc.