A good purchasing decision begins with the work and its constraints. Use this guide to define those constraints before comparing retailer listings.
Use a microcontroller for direct control
Microcontrollers start quickly, consume little power, and can provide predictable timing for sensors, motors, and simple interfaces. They remain the safer default for a control loop that must keep working without a full operating system.
Use a single-board computer for rich services
A Linux board is better when the project needs a browser interface, database, computer vision, multiple network services, or familiar application libraries. Protect storage from abrupt power loss and manage security updates.
Split the job when necessary
Many dependable systems use both: a microcontroller handles real-time I/O and safety states while a higher-level computer handles planning, logging, and user experience. Define what happens if either side stops communicating.