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.
Technical Specifications
Operating Voltage: 5V
Input Voltage: No external power supply is required when connected to USB, or external 7V - 12V DC input
Output Voltage: 5V DC output, 3.3V DC output, and external power input
Microprocessor: ATmega328
Bootloader: Arduino Uno
Clock Frequency: 16 MHz
Input Voltage (Recommended): 7 - 12V
Input Voltage (Limit): 6 - 20V
Supports USB interface protocol and power supply (no external power supply needed)
Supports ISP download function
Digital I/O Ports: 14 (4 PWM output ports)
Analog Input Ports: 6
DC Current for I/O Ports: 40mA
DC Current for 3.3V Port: 50mA
Flash Memory: 32 KB (ATmega328) (0.5 KB for the bootloader)
SRAM: 2 KB (ATmega328)
EEPROM: 1 KB (ATmega328)
Dimensions: 75x55x15mm
