ARDUINO UNO R3 + free support
Arduino Uno is a microcontroller board based on Atmega328. There are 16 digital I/O pins (6 of them are PWM out), 6 analog input pins, a 16 MHz crystal oscilator, an USB socket, a power socket, an ICSP connector and reset button on the board. There are the all essential parts on the board for microcontroller operations.
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This is the lasest version of Arduino Uno. There is a usb cable inside the package for seperator computer connection.
- Arduino Uno R3 (Clone)
- A to B Usb cable
Arduino Uno is a microcontroller board based on Atmega328. There are 16 digital I/O pins (6 of them are PWM out), 6 analog input pins, a 16 MHz crystal oscilator, an USB socket, a power socket, an ICSP connector and reset button on the board. There are the all essential parts on the board for microcontroller operations. The board can easily be connected to the computer via usb or can be used with an external adapter of battery.
Arduino Uno has an Atmega16u2 (It was Atmega8u2 on the Rev 2 model) usb – serial chip for programming and communicaiton with computer via usb.
Arduino.cc made various innovaitons on the Rev 3 in comparison with Rev 2 to be useful and stable. The Arduino Uno board has been a referance model as both software and hardware to all the other Arduino models. You may see the historical development of the Arduino boards by hardware index.
- Microcontroller: ATmega328
- Operating voltage: 5 V
- Supply voltage (recommended): 7-12 V
- Supply voltage (limits): 6-20 V
- Number of digital I/O pins: 14
- Number of PWM pins: 6
- Number of analog input pins: 6
- Max DC current for each I/O pins: 40 mA
- DC current for 3.3 V out: 50 mA
- Max DC current for 3.3 V pin: 1 A (if supplied with an external adapter)
- Flash memory: 32 kB (ATmega328, 0.5 kB is used by bootloader)
- SRAM: 2 kB (ATmega328)
- EEPROM: 1kB (ATmega328)
- Clock speed: 16 MHz
- Length: 68.6 mm
- Width: 53.4 mm
- Weight: 25 gr
Arduino Uno can be supplied via usb or an external voltage source. External voltage source would be an AC - DC adapter or a battery. When it is supplied with an external adapter or battery, using 2.1 mm width, center-positive, 7-20 V power supply is recommended. Moreover, the connectors of the power socket on the board, Vin and GND pins are short circuited in beckend. The battery can be connected to the board via GND and Vin pins.
It is not necessary to be connected to usb port during whole the operation. The board can be energized with only an adapter or a battery too, by this way, the board can work independently from the computer.
6 - 20 V can be used as an external supply but these are the limits for Uno. Recommanded voltage supply for this board is between 7 - 20 V. Becouse the regulator on the board might not work stabile for the voltages below 7V. Likewise, it can be over - warmed for the voltages above 12 V.
Operating voltage of the Arduino Uno's microcontroller is 5 V. If the voltage supplies the board via Vin pin or the power socket on 7 V to 12 V, then this voltage is regulated and distributed to the board by the regulator.
Power pins are like that:
- Vin: When an external adapter is used, the voltage of the adapter is on this pin. You can supply the board by applying 7-20 V among this pin instead of the on-board power connector.
- 5 V: The 5 V pin on the board is directly connected to the output of the regulator. To supply the board directly from this pin is not recommended due to that this way will not activate the 3.3 V and 5 V regulators on the board. If the board is supplied by usb (5 V), 5 V of the usb directly comes this pin. If the board is supplied by an external power supply or from Vin pin then the voltage of the 5 v pin comes from output of the regulator.
- 3.3 V: 3.3 V out pin from the regulator. Max. current is 50 mA.
- AREF: It is possible to change the referance voltage of the board.
- GND: Ground pins on the board.