The Arduino UNO R3 is the best board to get started with electronics and coding. If this is your first experience tinkering with the platform, the UNO is the most robust board you can start playing with. The Arduino UNO R3 is the most used and documented board of the whole Arduino family.
Description: Arduino UNO R3
1 Change Pin : AREF pin plus next two I2C pins (SDA and SCL, just Analog 4 and copy 5 , not additional I2C interface ) , in addition, in the next RESET also added two pins , one is IOREF , allowing expansion board to adapt the onboard voltage , this pin expansion board just told what is currently onboard voltage ( such as UNO is 5V, can be seen as copy power pins , does not provide power to pull level on ) , and the other is the future stand placeholder pins.
2 more stable RESET circuit . RESET key position has changed, has been moved near the USB interface board corner , more convenient press.
3. ATmega16U2 instead 8U2, this does not mean there are 16K flash of R3 make your code run faster , this update is the USB interface chip services , in theory, it allows UNO can simulate USB HID, such as MIDI / Joystick / Keyboard.
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of USB Arduino boards, and the reference model for the Arduino platform; for an extensive list of current, past or outdated boards see the Arduino index of boards.
Tech Specs: Arduino UNO R3
|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|