To provide reference voltage for input voltage.ĪTmega328P – 8 bit AVR family microcontroller Used to receive and transmit TTL serial data.ġ0 (SS), 11 (MOSI), 12 (MISO) and 13 (SCK) Used to provide analog input in the range of 0-5V
Vin: Input voltage to Arduino when using an external power source.ĥV: Regulated power supply used to power microcontroller and other components on the board.ģ.3V: 3.3V supply generated by on-board voltage regulator. Along with ATmega328P MCU IC, it consists other components such as crystal oscillator, serial communication, voltage regulator, etc. Arduino Uno is a popular microcontroller development board based on 8-bit ATmega328P microcontroller.
