![]() Hardware flow control pins (CTS, RTS) are not available in the Arduino framework. If you need extra UART ports, you can consider using the SoftwareSerial library. UARTĪTmega328P has only 1 UART and the TXD and RXD pins are connected to the USB-Serial chip on an Arduino Uno. You can access the LED pin as LED_BUILTIN in the Arduino IDE. Pin #Īrduino Uno has an onboard LED for debugging. All GPIO pins support internal pull-ups in the range of 20-50K. Some alternate function pins are excluded. If you are new to Arduino, we have a complete tutorial covering the basics of Arduino development framework using the popular Arduino Uno board.Įven though ATmega328P has 23 GPIOs, only 20 are available in the Arduino framework. Arduino Pinsīelow are Arduino pin assignments used for the official Arduino Uno board with an ATmega328P. RESET also has GPIO function but it can only be used when the external reset function is disabled. A LOW pulse of 2.5 μs or longer can reset the MCU (without the capacitor). This pin is usually pulled up with a 10K resistor and a 0.1uF capacitor connected to GND. RESET is an active-low external reset input for ATmega328P. The AREF pin is used to decouple the ADC reference voltage for better noise performance. The ATmega328P has two options for the ADC reference voltage an internal reference of 1.1V (nominal) and AVCC supply. You could connect a low-noise supply to this pin, but in that case, the supply voltage must not differ from the VCC by more than ☐.3V. This pin should be connected to VCC externally along with a filter capacitor, even if the ADC is not used. AVCCĪVCC is the supply pin for the internal ADC of ATmega328P. See “Alternate Functions of Port B” in the datasheet for more info. Both pins have IO functions, but those functions can be not used while the pins are used for clock input. If you have an external clock source, it can be connected to XTAL1 while leaving XTAL2 floating. The fuses also need to be configured to select an external oscillator. A crystal oscillator can be connected to these pins along with capacitors. XTAL1 and XTAL2 are the pins for providing external clock signals to the microcontroller. Changing the voltage will also change the maximum clock frequency the microcontroller can run reliably. All GND pins should be connected together. ![]() Click the link to open an interactive preview, or download it directly.ĪTmega328P-28-DIP-Pinout-Diagram-Rev-0.5-CIRCUITSTATE-Electronics-1 Download Pin Reference Power & Control VCC & GND PDF preview may not load on mobile devices. PNG Click for higher resolutionĮven though only Arduino digital pins are shown, all other peripheral pins have the same functions in the Arduino environment. If you found any errors here, please let us know in the comments. Please also double-check the pin assignments with that from the official documentation. While we try our best to be accurate and up-to-date here, we can not guarantee correctness. Pinouts are based on the latest documentation from the manufacturer. 6 (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby)
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