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Arduino UNO R3 Development Board ATmega328P

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Arduino UNO R3 Development Board ATmega328P

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 Arduino UNO R3 is the most robust board you can start playing with.

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Arduino UNO R3 Development Board ATmega328P

The Arduino UNO R3 is the best board to get started first of all with electronics and coding. If this is your first experience tinkering with the platform,probably the UNO R3 is the most robust board you can start playing with. The UNO R3 is the most used and documented  above all other boards of the whole Arduino family. Arduino UNO R3 Development Board Based on Atmel ATmega328P It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs

Technical Specifications of Arduino UNO R3 

  • Microcontroller ATmega328P
  • Operating Voltage 5V
  • 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
  • LED_BUILTIN Pin No 13
  • Length 68.6 mm
  • Width 53.4 mm
  • Weight 25 g

Power for Arduino UNO R3 

The Arduino UNO R3 can be powered via the USB connection and also with an external power supply. The power source is selected automatically.Besides that 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. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector.

Arduino UNO R3 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 7 to 12 volts.

The power pins of Arduino UNO R3 are as follows:

  •  VIN. The input voltage to the Arduino board when it’s using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin.
  • 5V.This pin on Arduino UNO R3 outputs a regulated 5V from the regulator on the board. The board can be supplied with power either from the DC power jack (7 – 12V), the USB connector (5V), or the VIN pin of the board (7-12V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. We don’t advise it.
  •  3V3. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA.
  •  GND. Ground pins of Arduino UNO R3 .

Input and Output

Each of the 14 digital pins on

the Arduino UNO R3 can be used as an input or output, using pinMode(),digitalWrite(), and digitalRead() functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. In addition, some pins have specialized functions:

  • Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data. These pins are connected to the corresponding pins of the ATmega8U2 USB-to-TTL Serial chip.
  • External Interrupts: 2 and 3. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt() function for details.
  • PWM: 3, 5, 6, 9, 10, and 11. Provide 8-bit PWM output with the analogWrite() function.
  • SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK). These pins support SPI communication using the SPI library.
  • LED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it’s off.

The Arduino UNO R3 has 6 analog inputs, labeled A0 through A5, each of which provide 10 bits of resolution (i.e.1024 different values). By default they measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the analogReference() function. Additionally, some pins have specialized functionality:

  •  TWI: A4 or SDA pin and A5 or SCL pin. Support TWI communication using the Wire library.

There are a couple of other pins on the board:

  • AREF: Reference voltage for the analog inputs. Used with analogReference().
  • Reset: Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board.

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