The Arduino Uno is a micro-controller board based on the ATmega328. It has 14 digital input/outputpins (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 micro-controller;simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started .
The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega16U2Atmega8U2 up to version R2) programmed as a USB-to-serial converter. While the Arduino UNO can be powered via the USB connection or with an external power supply, the power source is selected automatically.
External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2.1mm center-positive plug into the board’s power jack. Also leads from a battery can be inserted in the Gnd and Vin pin headers of the Power connector. The board can operate on an external supply of 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 5v to 12v for Arduino Uno.
1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible with both the board that uses the AVR, which operates with 5V and with the Arduino Due that operates with 3.3V. The second one is a not connected pin, that is the reserve for future purposes.
Stronger RESET circuit.
Atmega 16U2 replace the 8U2.
ATmega328P – 8 bit AVR family microcontroller
Analog I/O Pins
Digital I/O Pins
14 (Out of which 6 provide PWM output)
DC Current per I/O Pin
DC Current per I/O Pin: 40 mA ; DC Current for 3.3V Pin: 50 mA
Digital I/O Pins
14 (of which 6 provide PWM output)
1 KB (ATmega328)
32 KB (ATmega328) of which 0.5 KB used by bootloader
PWM Output Pins
2 KB (ATmega328)
Frequency (Clock Speed)
DIY project prototyping.
Developing varied varieties of projects that require a code based control.