Uno Rev.3 is a microcontroller board based on the ATmega328P (datasheet). There are 14 digital input/output pins (of which 6 can be used as PWM outputs) in a package that also includes 6 analog inputs, 16 MHz quartz crystal, USB connection, power jack, ICSP header and reset button. It contains everything needed to support the microcontroller. In starting,you can simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery. You can tinker with your UNO without worrying too much about doing something wrong. Worst case scenario is you can replace the chip for a few dollars and start over again.
“Uno” means one in Italian 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, evolving to newer releases. The Uno board is the first in a series of USB Arduino boards, the reference model for the Arduino platform.
|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 bootloader|
|SRAM||2 KB (ATmega328P)|
|EEPROM||1 KB (ATmega328P)|
|Clock Speed||16 MHz|
For detailed documentation, please visit the ff. websites: