![]() ![]() Typically used to add a reset button to shields which block the one on the board. Bring this line LOW to reset the microcontroller. There are a couple of other pins on the board:ĪREF. Support TWI communication using the Wire library. Additionally, some pins have specialized functionality: 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. The Uno has 6 analog inputs, labeled A0 through A5, each of which provide 10 bits of resolution (i.e. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off. There is a built-in LED connected to digital pin 13. These pins support SPI communication using the SPI library. Provide 8-bit PWM output with the analogWrite() function. See the attachInterrupt() function for details. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. These pins are connected to the corresponding pins of the ATmega8U2 USB-to-TTL Serial chip.Įxternal Interrupts: 2 and 3. Used to receive (RX) and transmit (TX) TTL serial data. In addition, some pins have specialized functions: 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. It also has 2 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library).Įach of the 14 digital pins on the Uno can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. The ATmega328 has 32 KB (with 0.5 KB used for the bootloader). The ATmega328 on the Arduino Uno comes preburned with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. For details, see the reference and tutorials. Select "Arduino Uno from the Tools > Board menu (according to the microcontroller on your board). The Arduino Uno can be programmed with the Arduino software (download). Online language reference for Arduino programming, using the free IDE development environment. 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.ĭigital I/O Pins – 14 (of which 6 provide PWM output) įlash Memory – 32 KB (ATmega328) of which 0.5 KB used by bootloader Ĭollection of information and software resources for interfacing Arduino cards with a wide range of hardware devices at Programming Language reference 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. The Arduino Uno is a microcontroller board based on the ATmega328 ( datasheet). ![]()
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