Digital Twin

This repository contains demo code of basic twin system involving openplc system (RPi + openplc) and Eclipse Ditto framework. This project uses Python for the Raspberry Pi code and jQuery for the Web UI.

System overview

                       Peltier cell
                        (Cooling)
                            |
                     Output |
                            |     (Modbus TCP/IP)       (Web sockets)                 (HTTP APIs)
   Temp sensor --------> OpenPLC <---------------> RPi <-------------> Eclipse Ditto <------------>  Webapp
           (Analog input)   |
                            |Output
                            |
                       Peltier cell
                        (Heating)

Technologies used

Hardware:

• Unipi 1.1(PLC)
• Raspberry Pi 3
• Thermo electric coolers (Peltier cells)
• DC motor fans (along with heatsink)
• Temperature sensor

Software:

• Eclipse Ditto(As a backend or server) – runs inside a docker
• Flask Framework (python based webserver for uploading plc programs)
• Bootstrap and jquery (For front-end application)
• OpenPlc Editor for plc programming

Protocols:

• HTTP
• Websocket
• Modbus TCP/IP

Reference

• https://www.eclipse.org/ditto/intro-overview.html
• https://www.openplcproject.com/
• https://github.com/eclipse/ditto
• https://github.com/eclipse/ditto-examples
• https://github.com/thiagoralves/OpenPLC_v3
• https://github.com/thiagoralves/OpenPLC_Editor