01 / EMBEDDED
Interfaces for controllers, instruments and machines: navigation, parameters, alarms and system status on touch displays or physical controls.
Platforms and tools follow your context. Some examples:
Embedded
Interfaces for devices and machines
LVGL · Qt / QMLChosen for the platform
Navigation · states · commandsClear user operations
Touch · buttons · controlsUse on the real device
Firmware · data · protocolsMachine state and commands
Values · trends · messagesOperational information
Responsiveness · memory · testsResources and real use cases
The technologies shown are examples.
Engineering support within your team, with shared tools and working methods.
TECHNICAL SCOPE
An HMI must explain machine state and guide permitted operations. Flows, roles and error behaviour are defined before visual details. LVGL is considered for MCU platforms; Qt and QML for systems with different resources and requirements. Presentation remains separate from control logic.
Tools follow the display, operating system, memory, libraries and existing code. I work with firmware, machine-control and design teams to define data ownership, permitted commands and interface behaviour when the system is busy or disconnected.
A verification scenario includes a parameter change, controller confirmation, communication loss and reconnection. The operator should distinguish requested values, confirmed values and stale data. Navigation and messages are also checked at the intended display resolutions.
Implemented screens, reusable components, data interfaces and verification scenarios. Resolution, refresh timing and behaviour when controller communication is unavailable are agreed explicitly.
Bring display and board specifications, example parameters and alarms, operator profiles and real operating sequences.
I treat it as part of the starting context. A framework change is assessed for specific needs, compatibility and maintenance rather than as an automatic requirement.
SLX ReelSync connects a Raspberry Pi LVGL dashboard to a virtual winding line: embedded Linux, TLS over Wi-Fi, contextual alarms and repeatable fault tests.
SLX SolarPilot connects a Linux/LVGL touch controller to a residential plant simulated in 3D: photovoltaics, storage, appliances and EV charging with EEBUS and SunSpec Modbus TCP.
SLX FlowControl shows industrial HMI development on an STM32H750B-DK: FreeRTOS real-time control, Modbus TCP/IP and a Factory I/O digital twin for checking sequences, alarms and diagnostics before machine integration.
A practical view of LVGL 9 for embedded interfaces: rendering, memory, widgets, portability and when it beats heavier UI stacks.
When Qt/QML makes sense for embedded interfaces, what it costs in resources and how to design maintainable HMI architectures.
THE NEXT STEP
