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[1] A development electronic board/microprocessor development board (MDB)/development board is a printed circuit board (PCB) with a microprocessor and minimal support logic for an engineer/one who seeks to be acquainted with the microprocessor on the board to learn to program it. It also served users of the microprocessor as a method to prototype applications in products.
microprocessor: compact, 1 chip IC acting as a device's CPU, handling logic, arithmetic, and control functions
Microprocessor: The "brain" running the software code.
Memory: Flash memory that stores the program and RAM for temporary data execution.
Input/Output (I/O) pins: Breakout pins allowing the processor to communicate with external components (sensors, actuators).
Debug interface: Connectors like JTAG or SWD, which lets user troubleshoot and download code.
Power supply: Circuitry regulating input power (often USB) to voltage needed by processor.
Clock source: Often a quartz crystal, that provides timing signals for processor's operations.
USB port: The part that connects the MDB to a computer via USB
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Arduino Mega 2560: