Modern machine control is no longer limited to simple relay logic or isolated PLC programs. Many machines now need a local display, network connection, data logging, remote diagnostics, protocol conversion, user management, and sometimes camera or AI-assisted inspection. These requirements create a need for an embedded computing platform that is more capable than a microcontroller but more compact and product-friendly than a traditional industrial PC.
An SBC based on the NXP i.MX8 series can be a strong option for this type of machine control application. The i.MX8 family is widely used in embedded and industrial products because it provides ARM-based computing, rich interfaces, multimedia support, long lifecycle options, and a mature Linux ecosystem. When built into a single-board computer, it can become the central HMI, gateway, monitoring, or supervisory control platform inside modern equipment.
In many machines, an i.MX8 SBC does not replace the PLC or real-time controller. Instead, it works together with them. The PLC or microcontroller handles deterministic control, while the i.MX8 SBC manages the user interface, communication, data processing, remote access, and higher-level application
logic.
What Is an NXP i.MX8 SBC?
An NXP i.MX8 SBC is a single-board computer built around one of NXP’s i.MX8 processors. Depending on the exact processor model, the board may include ARM Cortex-A application cores, Cortex-M real-time cores, GPU, display controller, camera interface, Ethernet, USB, CAN, UART, SPI, I2C, GPIO, audio, PCIe, memory, eMMC storage, and power management circuits.
The i.MX8 family includes several variants, such as i.MX8M Mini, i.MX8M Nano, i.MX8M Plus, and other higher-end i.MX8 platforms. Different versions target different performance and interface requirements. Some are designed for compact HMI products, while others are better suited for multimedia, camera, AI, or industrial gateway applications.
As an SBC, the processor is combined with memory, storage, connectors, power input, and board-level circuitry. This reduces development time because product teams do not need to design the complete processor platform from the beginning. Instead, they can focus on the machine interface, enclosure, software, and production requirements.
Why i.MX8 Is Suitable for Machine Control
Machine control products require long-term stability, reliable interfaces, and predictable product lifecycles. NXP i.MX platforms are often selected for industrial and professional equipment because they offer good documentation, ecosystem support, software resources, and lifecycle planning.
An i.MX8 SBC can run a full Linux system, which allows developers to build complex software features. These may include an HMI application, industrial communication service, local database, web dashboard, cloud client, remote maintenance tool, and device monitoring daemon.
Compared with a microcontroller, an i.MX8 SBC provides much stronger software capability. It can run Linux services, support graphical interfaces, store files, manage network communication, and use mature software libraries.
Compared with an industrial PC, an i.MX8 SBC is usually smaller, lower power, easier to integrate, and more suitable for custom embedded equipment. It can fit inside control panels, operator terminals, machine cabinets, and compact industrial devices.
Typical Machine Control Applications
An NXP i.MX8 SBC can be used in many machine control scenarios.
In an industrial HMI, the SBC drives a TFT display and touch panel. Operators can view machine status, check alarms, change parameters, monitor production counters, and access maintenance pages.
In an industrial gateway, the board collects data from PLCs, sensors, motor drives, meters, and other devices. It can convert protocols and send data to SCADA, MES, local servers, or cloud platforms.
In equipment monitoring, the SBC can record running time, fault codes, temperature, pressure, vibration, energy consumption, and operation history. This helps maintenance teams understand machine health and reduce downtime.
In production test equipment, the board can control test sequences, read UART or RS485 data, switch relays, display test results, store reports, and upload records to a factory database.
In camera-assisted machines, an i.MX8 SBC can capture images, display preview, scan barcodes, verify object presence, or support basic inspection functions depending on the selected processor and software stack.
Linux Software Platform
Linux is one of the main reasons i.MX8 SBCs are useful in machine control. It provides mature support for networking, file systems, drivers, process management, security, and application development.
A Linux-based machine controller can run multiple services at the same time. For example, it may run a Qt HMI, an MQTT client, a Modbus service, a local SQLite database, a watchdog process, a logging system, and an OTA update agent.
Developers can use C, C++, Python, Go, Rust, JavaScript, shell scripts, or other languages depending on the application. For performance-critical services, C or C++ is often preferred. For configuration tools or automation scripts, Python or shell scripts can be useful.
Linux images for i.MX8 products are commonly built with Yocto, Buildroot, or vendor-provided BSPs. Yocto is suitable for highly controlled production systems. Buildroot is useful for smaller and simpler firmware images. A Debian-based system can be convenient for development, but it may include unnecessary packages for production devices.
Real-Time Control Boundaries
Standard Linux is not a hard real-time operating system. This is important in machine control design.
An i.MX8 SBC is well suited for HMI, data logging, network communication, supervisory control, remote management, and high-level decision logic. However, tasks requiring strict microsecond timing, safety-critical response, or precise motor control should usually be handled by a PLC, dedicated motion controller, microcontroller, or real-time subsystem.
A common architecture is:
- PLC or MCU handles deterministic machine control
- Motor controller handles motion loops
- Safety controller handles safety functions
- i.MX8 SBC handles HMI, data, communication, and supervision
Some i.MX8 processors include Cortex-M cores, which can be used for real-time or low-level tasks while the Cortex-A cores run Linux. This heterogeneous design can be useful when the system needs both Linux flexibility and lower-level control.
PREEMPT_RT Linux can also reduce latency for some applications, but it still requires careful measurement and testing under real load. It should not be assumed to replace a safety controller or dedicated real-time controller.
Industrial Communication Interfaces
Machine control systems depend on communication. An i.MX8 SBC may need to connect with PLCs, sensors, drives, meters, relays, I/O modules, and factory networks.
Common interfaces include Ethernet, RS485, RS232, CAN, USB, UART, SPI, I2C, GPIO, and sometimes PCIe. Ethernet is used for Modbus TCP, OPC UA, MQTT, HTTP, remote maintenance, and factory network integration. RS485 is widely used for Modbus RTU and long-distance communication. CAN is common in vehicles, energy systems, motion-related devices, and some industrial control products.
The board design must include proper transceivers and protection. A raw UART pin from the processor is not enough for a real industrial RS485 port. Field wiring may face surge, ESD, ground noise, long cables, and interference from motors or relays. Isolation and protection should be considered for industrial environments.
For machine control products, interface planning should happen early. The number of serial ports, Ethernet ports, CAN channels, GPIO lines, and USB connections affects both hardware design and software architecture.
HMI Display and Touch Integration
Many machine control systems include a local operator interface. An i.MX8 SBC can support TFT displays, capacitive touch panels, and graphical user interfaces.
Depending on the board and processor model, display interfaces may include MIPI DSI, LVDS, HDMI, eDP, or RGB. Common industrial HMI display sizes include 7 inch, 10.1 inch, 12.1 inch, and 15 inch. Smaller displays may be used in compact machines, while larger displays are suitable for complex equipment interfaces.
Touch panels may connect through I2C or USB. Capacitive touch is common in modern HMI products, but industrial use may require glove operation, water rejection, thick cover glass support, and anti-interference tuning.
Software frameworks such as Qt, LVGL, GTK, or browser-based UI can be used. Qt is widely used for industrial HMI because it provides a mature graphical framework and good embedded support. LVGL is useful for lightweight interfaces. A web-based UI may be useful if the same interface must be accessed locally and remotely.
Data Logging and Local Storage
Modern machines generate valuable data. An i.MX8 SBC can collect and store this data locally.
Typical data includes machine status, production count, alarm history, user operations, temperature, pressure, vibration, current, voltage, cycle time, and error codes. This information can support maintenance, troubleshooting, quality tracking, and production analysis.
For simple logs and configuration, SQLite may be enough. For time-series data, a custom log format or lightweight database may be used. The storage design must consider write frequency and eMMC lifetime.
If the device writes logs continuously, engineers should use log rotation, controlled write intervals, and separate data partitions. A read-only root filesystem with a writable data partition can improve reliability, especially in systems that may lose power unexpectedly.
Edge Processing and Remote Monitoring
An i.MX8 SBC can process data locally before sending it to a server. This is useful when network bandwidth is limited or when the machine must continue operating without cloud access.
Edge processing may include filtering sensor data, detecting abnormal trends, calculating machine utilization, counting production cycles, generating maintenance alerts, or compressing data before upload.
For remote monitoring, the SBC can send data through MQTT, HTTP, WebSocket, OPC UA, or custom protocols. It can also provide a local web dashboard for maintenance staff.
Remote access should be designed carefully. Secure authentication, VPN, firewall rules, and encrypted communication should be considered. A machine controller connected to a network should not expose critical functions without protection.
Camera and Vision Functions
Some machine control applications require image capture or vision assistance. An i.MX8 SBC can support camera-based functions depending on the selected processor and board design.
Possible camera applications include barcode scanning, object presence detection, operator assistance, process monitoring, alignment checking, and simple quality inspection.
Camera integration requires more than connecting a sensor. Engineers must consider lens selection, lighting, sensor driver support, image pipeline, mechanical position, and software framework. V4L2, GStreamer, OpenCV, and vendor tools may be used.
For advanced AI vision, processor selection matters. Some i.MX8 platforms may support AI acceleration, while others are better suited for basic image capture and display. The actual workload should be tested before final hardware selection.
Power Design for Industrial Machines
Machine environments can be electrically noisy. Power design must be more robust than in consumer electronics.
Many industrial systems use 12V or 24V power input. Some need a wide input range. Protection against reverse polarity, surge, ESD, overvoltage, and power noise should be considered.
The SBC may share power with sensors, relays, motors, displays, and communication modules. Poor power design can cause reboot, data corruption, communication errors, or display instability.
For production products, engineers should test power cycling, voltage dips, sudden power loss, and recovery behavior. If the machine can lose power while writing data, the storage strategy must be designed for safe recovery.
Thermal Design and Mechanical Integration
Machine control devices may be installed inside sealed cabinets, metal housings, or operator panels. Thermal design must be tested in the final enclosure.
Heat sources include the i.MX8 processor, display backlight, power circuits, Ethernet PHY, wireless modules, and external I/O circuits. Even if the processor itself is efficient, the total system can become warm in a closed space.
Thermal solutions may include metal mounting plates, heat spreaders, thermal pads, copper areas, ventilation paths, or controlled CPU frequency. The goal is stable operation under worst-case load and ambient temperature.
Mechanical design should also protect connectors and cables from vibration. Display cables, touch cables, serial connectors, and power connectors should be secured properly. If the device is mounted on a moving machine, vibration testing is important.
Firmware Update Strategy
Machine control products often stay in service for many years. Firmware updates are necessary for bug fixes, security patches, new features, and customer-specific changes.
Possible update methods include USB update, SD card update, Ethernet update, remote OTA update, application-only update, or full image update. For important equipment, an A/B partition strategy with rollback can reduce the risk of failed updates.
An update mechanism should handle power loss, failed downloads, wrong package versions, incompatible hardware revisions, and application failure after update. Update packages should be verified before installation.
Clear version management is also important. Each device should report its firmware version, hardware revision, serial number, and update history.
Security Considerations
Machine controllers are increasingly connected to factory networks and remote services. Security must be part of the design.
Basic measures include removing default passwords, disabling unused services, restricting SSH access, using encrypted communication, protecting credentials, verifying update packages, and limiting user permissions.
If the SBC communicates with PLCs or controls machine functions, network segmentation should be considered. Critical control interfaces should not be exposed to public or untrusted networks.
User roles may also be needed. Operators, maintenance engineers, and administrators may require different permissions. Logs should record important operations such as parameter changes, remote access, and firmware updates.
Production Testing
An i.MX8 SBC-based machine control product should support repeatable factory testing.
Production tests may include display test, touch test, Ethernet test, USB test, RS485 test, CAN test, UART test, GPIO test, audio test, camera test, storage test, and power input test. If the product includes relays or external I/O, these should also be tested.
Serial number programming, MAC address writing, firmware flashing, hardware revision detection, and aging tests should be included in the production process.
A dedicated factory test application can improve efficiency and reduce manual errors. Test results can be stored locally or uploaded to a production database.
Selecting the Right i.MX8 SBC
When selecting an NXP i.MX8 SBC for machine control, engineers should start from the complete system requirement.
Important selection factors include:
- Processor model
- RAM capacity
- eMMC size
- Display interface
- Touch panel support
- Ethernet ports
- RS485, CAN, UART, and GPIO
- USB expansion
- Camera input
- Power input range
- Operating temperature
- Mechanical size
- Thermal design
- Linux BSP support
- Device tree examples
- Documentation quality
- Long-term supply
- Vendor technical support
- Production flashing tools
The most powerful board is not always the best choice. The best SBC is the one that fits the machine architecture, software plan, interface requirement, enclosure, cost target, and lifecycle expectation.
Conclusion
An NXP i.MX8 SBC is a strong platform for modern machine control applications. It provides the computing capability, Linux software environment, industrial interfaces, display support, data processing, and long-term ecosystem needed for professional equipment.
In a well-designed system, the i.MX8 SBC can work as an HMI controller, industrial gateway, data logger, remote monitoring device, or supervisory control platform. It can operate together with PLCs, microcontrollers, motor controllers, sensors, and safety systems.
A successful project requires careful planning of real-time control boundaries, industrial communication, display and touch integration, power protection, thermal design, storage reliability, firmware update, security, and production testing.
When the SBC, operating system, machine interfaces, enclosure, and application software are designed together, an NXP i.MX8 series SBC can provide a reliable foundation for intelligent and connected machine control products.