Arduino Uno R3
The flagship microcontroller board based on the ATmega328P featuring 14 digital I/O pins (6 PWM), 6 analog inputs, 16 MHz quartz crystal, USB connection, power jack, and ICSP header.
Aliase:Uno, Uno R3, ATmega328P Board, A000066
Board Overview & Layout
Board Layout
Arduino Uno R3 Board Pinout (Digital, Analog & Power)
32 Pins
Pin-Tabelle32
| Pin | Signal / Name | Typ | Alternative Funktionen |
|---|---|---|---|
| 1 | NC | NC | Not Connected (Reserved) |
| 2 | IOREF | Power | I/O Reference Voltage (+5.0V) |
| 3 | RESET | Reset | MCU Reset (Active Low)PC6PCINT14 |
| 4 | 3V3 | Power | +3.3V Regulated Output (LP2985 max 50mA) |
| 5 | 5V | Power | +5V Main Power Rail (from USB or Onboard 5V LDO) |
| 6 | GND | Ground | Ground (0V) |
| 7 | GND | Ground | Ground (0V) |
| 8 | VIN | Power | Unregulated Input Voltage (7V - 12V DC) |
| 9 | A0 | Analog | Analog Input 0 (ADC0)PC0PCINT8 |
| 10 | A1 | Analog | Analog Input 1 (ADC1)PC1PCINT9 |
| 11 | A2 | Analog | Analog Input 2 (ADC2)PC2PCINT10 |
| 12 | A3 | Analog | Analog Input 3 (ADC3)PC3PCINT11 |
| 13 | A4 | Analog | Analog Input 4 (ADC4)I2C SDA (TWD)PC4PCINT12 |
| 14 | A5 | Analog | Analog Input 5 (ADC5)I2C SCL (TWCK)PC5PCINT13 |
| 15 | D0 | Digital | UART RXDPD0PCINT16 |
| 16 | D1 | Digital | UART TXDPD1PCINT17 |
| 17 | D2 | Digital | External Interrupt INT0PD2PCINT18 |
| 18 | D3~ | Digital | PWM Timer 2B (OC2B)External Interrupt INT1PD3PCINT19 |
| 19 | D4 | Digital | Timer 0 External Clock Input (T0)USART External Clock (XCK)PD4PCINT20 |
| 20 | D5~ | Digital | PWM Timer 0B (OC0B)Timer 1 External Clock Input (T1)PD5PCINT21 |
| 21 | D6~ | Digital | PWM Timer 0A (OC0A)Analog Comparator Positive Input (AIN0)PD6PCINT22 |
| 22 | D7 | Digital | Analog Comparator Negative Input (AIN1)PD7PCINT23 |
| 23 | D8 | Digital | Timer 1 Input Capture (ICP1)Divided System Clock Output (CLKO)PB0PCINT0 |
| 24 | D9~ | Digital | PWM Timer 1A (OC1A)PB1PCINT1 |
| 25 | D10~ | Digital | PWM Timer 1B (OC1B)SPI Slave Select (SS)PB2PCINT2 |
| 26 | D11~ | Digital | PWM Timer 2A (OC2A)SPI Master Out Slave In (MOSI)PB3PCINT3 |
| 27 | D12 | Digital | SPI Master In Slave Out (MISO)PB4PCINT4 |
| 28 | D13 | Digital | SPI Serial Clock (SCK)Onboard Yellow LED (L)PB5PCINT5 |
| 29 | GND | Ground | Ground (0V) |
| 30 | AREF | Analog | Analog Reference Voltage (ADC VREF) |
| 31 | SDA | Digital | I2C Serial Data (TWD)PC4PCINT12 |
| 32 | SCL | Digital | I2C Serial Clock (TWCK)PC5PCINT13 |
ATmega328P ICSP Programming Header (2x3 Header)
6 Pins
Pin-Tabelle6
| Pin | Signal / Name | Typ | Alternative Funktionen |
|---|---|---|---|
| 1 | CIPO | Digital | PB4SPI CIPOPCINT4 |
| 2 | +5V | Power | Power Output (+5V) |
| 3 | SCK | Digital | PB5SPI SCKPCINT5 |
| 4 | COPI | Digital | PB3SPI COPIPCINT3Timer 2A (OC2A) |
| 5 | RESET | Reset | PC6MCU Reset (Active Low) |
| 6 | GND | Ground | Ground (0V) |
ATmega16U2 USB-Bridge ICSP Header (2x3 Header)
6 Pins
Pin-Tabelle6
| Pin | Signal / Name | Typ | Alternative Funktionen |
|---|---|---|---|
| 1 | CIPO | Digital | SCK |
| 2 | +5V | Power | Power Output (+5V) |
| 3 | SCK | Digital | CIPO |
| 4 | COPI | Digital | UPDI Programming Mode |
| 5 | RESET | Reset | ATmega16U2 Reset (Active Low) |
| 6 | GND | Ground | Ground (0V) |