Arduino Uno Description
Arduino Uno is a microcontroller board based on the ATmega328P (datasheet).
It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection,
a power jack, an ICSP header and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a
USB cable or power it with a AC-to-DC adapter or battery to get started.. You can tinker with your UNO without worring too much about doing something wrong,
worst case scenario you can replace the chip for a few dollars and start over again. “Uno” means one in Italian and was chosen to mark the release of Arduino
Software (IDE) 1.0. The Uno board and version 1.0 of Arduino Software (IDE) were the reference versions of Arduino, now evolved to newer releases.
The Uno board is the first in a series of USB Arduino boards, and the reference model for the Arduino platform; for an extensive list of current, past or outdated
boards see the Arduino index of boards.
Arduino Uno Tech Specification
| Microcontroller | ATmega328P | |
| Operating Voltage | 5V | |
| Input Voltage (recommended) | 7-12V | |
| Input Voltage (limit) | 6-20V | |
| Digital I/O Pins | 14 (of which 6 provide PWM output) | |
| PWM Digital I/O Pins | 6 | |
| Analog Input Pins | 6 | |
| DC Current per I/O Pin | 20 mA | |
| DC Current for 3.3V Pin | 50 mA | |
| Flash Memory | 32 KB (ATmega328P) of which 0.5 KB used by boot loader | |
| SRAM | 2 KB (ATmega328P) | |
| EEPROM | 1 KB (ATmega328P) | |
| Clock Speed | 16 MHz | |
| LED_BUILTIN | 13 | |
| Length | 68.6 mm | |
| Width | 53.4 mm | |
| Weight | 25g | |
Arduino Uno Memory
The ATmega328 has 32 KB (with 0.5 KB occupied by the bootloader). It also has 2 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library).
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