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Evaluation boards are designed to enable engineers to evaluate usage and applications for specific devices, such as microcontrollers, microprocessors, memory chips, and even development boards. Expansion boards, daughter cards, and a variety of other components can be attached to the evaluation board to explore and extend the features and functions available for specific applications. This article provides an overview of the evaluation board, the associated expansion boards and daughter cards, and the ways in which the two work together in the context of various application fields and specific working principles.

What Is an Evaluation Board?
An evaluation board, also known as a demo board or breadboard, is a printed circuit board (PCB) or module that has been designed to allow users to evaluate and test a device before integrating it into a larger system. The board may contain sample code, are pre-programmed configuration settings, connections for input/output and power, as well as other necessary components and features such as switches, LEDs, and connectors. Evalutation boards come in a range of sizes, shapes, and capabilities; but the most common type is the distinct long, thin shape that is often called a "breadboard."

Expansion Boards
Expansion boards are boards that are used to expand the features or capabilities of the evaluation board. These boards connect directly to the evaluation board using integrated connectors and expand the available I/O (input/output) options for the system. Expansion boards can include additional memory, input and output options, ports, and other components. Many have their own EEPROM (a type of memory) to store data. Some also include Digital Signal Processing (DSP) capabilities for enhanced processing power or data analysis. Expansion boards can also be used to add real-time clock and calendar (RTC) features to an evaluation board.

Daughter Cards
Daughter cards are add-on boards or modules that are designed to extend the evaluation board with additional peripheral options. Daughter cards are typically smaller and narrower in shape, but they may also have their own connectors and components to provide extended features or functionality. These can include microcontrollers, ROM (read-only memory) chips, and RAM (random access memory) components for improved performance. Daughter cards may also include USB ports, serial ports, digital I/O (input/output) connections, and analog I/O connections.

Application Fields and Working Principles
Evaluation boards, expansion boards, and daughter cards are used for a variety of application fields and working principles. In industrial settings, the boards and modules may be used to design and test automation equipment, robots, and production line machines. In medical settings, the boards may be used for testing medical devices such as implants, pacemakers, and patient monitoring systems. In automotive engineering, the boards and modules may be used to test motor controllers, navigation systems, and safety features. Other applications include communication systems, consumer electronics, security systems, and more.

The actual functioning principles of each type of board or module can vary depending on the specific application. Generally, evaluations boards are used as a platform to test and configure a specific set of devices before implementing them in a larger system. Expansion boards will extend the evaluation boards’ capabilities with additional components, such as greater memory, different peripheral ports, and more. Daughter cards may provide improved performance with microprocessors, memory chips, and dedicated circuits. Together, these components can help create a comprehensive, custom development platform.

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