: A voltage regulator circuit, such as the LM7805 or AMS1117, to step down input voltage to a steady 5V or 3.3V, supported by decoupling capacitors (typically 0.1µF and 10µF).
: A 16 MHz crystal oscillator connected to the XTAL1 and XTAL2 pins, usually accompanied by two 22pF ceramic capacitors to GND. Atmega Development Board Schematic
An ATmega development board schematic typically includes the microcontroller (MCU), a power regulation stage, a clock source, and headers for programming and general-purpose I/O (GPIO). The most common design is based on the (the heart of the Arduino Uno). Core Schematic Components : A voltage regulator circuit, such as the
: The central chip, often the ATmega328P DIP-28 , with pins for VCC, GND, and GPIO. The most common design is based on the
: A 10kΩ pull-up resistor connected from the RESET pin to VCC to prevent accidental resets, often paired with a tactile push button to GND for manual resetting.
: An ICSP (In-Circuit Serial Programming) header consisting of MISO, MOSI, SCK, RESET, VCC, and GND for flashing firmware using an external programmer.