Arduino Uno R3 Specifications And Parts Name Labbled on Board

Arduino Uno Labelling

Arduino Uno R3 is the most popular project board under the Arduino name.
It is most widely used board and also have tonnes of support and projects available on the internet.
Here is the specification of the arduino board use ATmega 328 microcontroller.

Click here to know Basics of Arduino

Arduino Uno Labelling

Arduino Uno R3 Specifications

Microcontroller                                                     ATmega328
Operating Voltage                                                5V
Input Voltage (recommended)                             7-12V
Input Voltage (limits)                                            6-20V
Digital I/O Pins                                                     14 (of which 6 provide PWM output)
Analog Input Pins                                                 6
DC Current per I/O Pin                                        40 mA
DC Current for 3.3V Pin                                      50 mA
Flash Memory                                                      32 KB (ATmega328)
SRAM                                                                  2 KB (ATmega328)
EEPROM                                                             1 KB (ATmega328)
Clock Speed                                                        16 MHz
Length                                                                  68.6 mm
Width                                                                    53.4 mm
Weight                                                                  25 g

The maximum length and width of the Uno PCB are 2.7 and 2.1 inches respectively, with the USB connector and power jack extending beyond the former dimension. Four screw holes allow the board to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is 160 mil (0.16″), not an even multiple of the 100 mil spacing of the other pins.