The ideas behind using a Raspberry Pi for process control are published in raspberry4remoteServices.pdf (dir) at a-weinert.de.

Process control features

RasPi4 with RS485 and other GPIO

By certain configuration and utilising constraints we get 24/7 base for control software with

• cycles (1ms, 10ms, 20ms, 100ms, 1s)
• support for Modbus, MQTT, 1-wire and more
• HMI via Web-interface
• watchdog

Compared with industrial PLCs and weAut01 there is

• no supervising of power supply, and, hence
• no (cycle for) programmable reaction on power outages

Devices supported by the library include

• electronic electricity meter
• PV inverter
• bar code / QR code reader

A note on Copyright and License

For software and documentation developed for this project:

      Copyright © 2018  2023   A. Weinert
      Prof. Dr.-Ing. Albrecht Weinert     <a-weinert.de>
      weinert - automation   Bochum    <weinert-automation.de>
      All right reserved.

The software is open source and available by

SVN checkout. It uses open source libraries by other authors. Those parts keep their original license and author's copyright.