HMI inverter

HMI and Data Logger Software for Solar inverters

Inverter HMI

The request

Elettronica Santerno is a leading company in designing and marketing inverters for producing electricity from renewable sources. 

The client asked us to refactor the graphic interface code of the inverter’s control/data logging board—based on Linux and Qt libraries—with the goal of increasing their performance and solving some stability problems. 

After the first phase of the project, which solved the problems of the old code, new advanced measurement and data logging functions were added for better visualization of the inverter’s operating parameters. 

The client then asked us to implement kernel drivers and provide advice on electronic design for developing a new version of the board.

Challenges faced
Solutions implemented

  • Refactor existing code to optimize performance and solve some problems
  • Implement data logging functionality
  • Implement device drivers in the Linux kernel
Develer’s contribution
  • C++/Qt code for the HMI part
  • C code for the kernel driver part
  • Consulting for the new version of the board’s electronic design
  • Reduced boot time
  • Better product stability
  • Automated development and testing processes
  • Reduced production costs
Advantages of our solution

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Advantages of our approach

Applying Agile development methodologies (scrum, test-driven development, etc.) made it possible to follow the product’s evolution in detail which, being the first of a new generation, had requirements that were not yet fully specified.

Advantages of open source

We can definitely say that the presence of open-source and free software has been fundamental. The card was actually completely based on Linux and used the Qt libraries with the LGPL license; without them, the project certainly wouldn’t have been possible.


Elettronica Santerno

Makers of inverters for the production of electricity from renewable sources.


“It was a very interesting project with some parts that were inherited from a previous implementation. It was a difficult challenge to have to change the entire interior without changing anything externally.”

Francesco Sacchi Progettista embedded @Develer