The value of the internal pull-up resistor will be in the range of 20KΩ to 50KΩ. An additional feature of the Digital IO pins is the availability of internal pull-up resistor (which is not connected by default). In that 14 pins (D0 to D13) are true digital IO pins, which can be configured as per you application using pinMode(), digitalWrite() and digitalRead() functions.Īll these Digital IO pins are capable of sourcing or sinking 20mA of current (maximum 40mA is allowed). Of the 32 pins available on the UNO board, 22 pins are associated with input and output. What are the Input and Output Pins of Arduino UNO? 0.5 KB of the Flash Memory is used by the bootloader code.There are three different memories available in ATmega328P. Strictly speaking, this is specific to the MCU i.e., ATmega328P, used on the Arduino UNO Board. What are Different Memories of Arduino UNO? You can also supply the unregulated supply through the 2.1mm DC Jack, in which case, you can access the supplied voltage through the VIN Pin. The next way is to provide an unregulated supply in the range of 6V to 20V to VIN pin of the UNO (Pin number 26). The first and easy way is using the Type-B USB Connector. There are a couple of ways in which you can power the UNO board. But none the less, let me give you a brief overview about some important specifications of Arduino UNO. Technical Specifications of Arduino UNOĪs Arduino UNO is based on ATmega328P Microcontroller, the technical specifications of Arduino UNO are mostly related to the ATmega328P MCU. I will discuss about the pins of Arduino UNO in the Arduino UNO Pinout Section. There is also a 2.1 mm DC jack to provide external power supply.Īpart from that, the layout of Arduino UNO is very much self-explanatory. Layout of Arduino UNO BoardĪs you can notice, there is a Type-B USB connector on the left short edge of the board, which is used for powering on the board as well as programming the Microcontroller. All the components are placed on the top side of the PCB. The following image shows the layout of a typical Arduino UNO board. Other than that, rest is identical in both the boards. Arduino UNO comes in two variants: one consists of a 28-pin DIP Microcontroller while the other consists of 32 lead Quad Flat Package Microcontroller. Arduino UNO in DIP and SMD PackagesĪrduino UNO is based on ATmega328P Microcontroller, an 8-bit AVR Architecture based MCU from ATMEL. There are other boards like the Arduino Nano and the Arduino Mega, but UNO has been the go-to board for quick prototyping, Arduino Projects and DIY Projects.

Perhaps the most popular board in the Arduino line-up is the Arduino UNO. What Communication Interfaces are available on Arduino UNO?.What are the Input and Output Pins of Arduino UNO?.What are Different Memories of Arduino UNO?.Technical Specifications of Arduino UNO.

Arduino uno r2 datasheet