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Arduino Uno R3

Arduino Uno R3 pinout table

AVR 8-bit 16 MHz, 32 KB flash, 2 KB SRAM, logic 5 V.

Logic
5 V
Current per pin
≤ 20 mA recommended, 40 mA max
ADC
10-bit, 6 channels A0–A5
PWM
D3, D5, D6, D9, D10, D11
Power
USB 5 V or jack/VIN 7–12 V
PinHeaderGPIOTypeFunctionsNotes
NCPOWER/ANALOG-1–NCNot connected
IOREFPOWER/ANALOG-2–PowerLogic level indicator (5 V)Shields read this pin to know the board runs 5 V logic.
RESETPOWER/ANALOG-3–ControlReset ATmega328PPull LOW to reset.
3.3VPOWER/ANALOG-4–Power3.3 V outputFrom a small LDO, ~50 mA max.
5VPOWER/ANALOG-5–Power5 V output/inputRegulated 5V from USB or from the DC jack via the LDO. Don't feed external power here while USB/jack is connected.
GNDPOWER/ANALOG-6–GNDGround
GNDPOWER/ANALOG-7–GNDGround
VINPOWER/ANALOG-8–Power7–12 V inputSame supply as the DC jack (after the diode). 7–12 V recommended.
A0POWER/ANALOG-914AnalogADC0, PC0, D14
A1POWER/ANALOG-1015AnalogADC1, PC1, D15
A2POWER/ANALOG-1116AnalogADC2, PC2, D16
A3POWER/ANALOG-1217AnalogADC3, PC3, D17
A4POWER/ANALOG-1318AnalogADC4, PC4, D18, I2C SDA
A5POWER/ANALOG-1419AnalogADC5, PC5, D19, I2C SCL
SCLDIGITAL-1–UART/I2CI2C SCL (shared with A5), PC5
SDADIGITAL-2–UART/I2CI2C SDA (shared with A4), PC4
AREFDIGITAL-3–AnalogExternal ADC referenceOnly apply 0–5 V and call analogReference(EXTERNAL) before measuring. Wrong use can damage the chip.
GNDDIGITAL-4–GNDGround
D13DIGITAL-513GPIOPB5, SPI SCK, LED L onboard
D12DIGITAL-612GPIOPB4, SPI MISO
D11DIGITAL-711GPIOPB3, SPI MOSI, PWM
D10DIGITAL-810GPIOPB2, SPI SS, PWM
D9DIGITAL-99GPIOPB1, PWM
D8DIGITAL-108GPIOPB0
D7DIGITAL-117GPIOPD7
D6DIGITAL-126GPIOPD6, PWM
D5DIGITAL-135GPIOPD5, PWM
D4DIGITAL-144GPIOPD4
D3DIGITAL-153GPIOPD3, INT1, PWM
D2DIGITAL-162GPIOPD2, INT0
D1/TXDIGITAL-171UART/I2CPD1, Serial TXShared with USB-Serial (upload & Serial Monitor). Avoid using while uploading.
D0/RXDIGITAL-180UART/I2CPD0, Serial RXShared with USB-Serial. Circuits on RX can make uploads fail.

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