Arduino UNO is a microcontroller board based on the ATmega328P. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, 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 worrying too much about doing something wrong, worst case scenario you can replace the chip for a few dollars and start over again.
Replaceable chip
The ATmega328P can easily be replaced, as it is not soldered to the board.
Battery Connector
The Arduino UNO features a barrel plug connector, that works great with a standard 9V battery.
EEPROM
The ATmega328P also features 1kb of EEPROM, a memory which is not erased when powered off.
- Microcontroller: ATmega328 [DIP package]
- Clock Speed : 16 MHz .
- Operating Voltage: 5V
- Input Voltage : 7-12V
- Output Voltage : 5/3.3 V
- Digital I/O Pins: 14
- Analog Input Pins: 6
- Support Communication Protocols : UART, I2C ,SPI ,etc.


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