Semiconductor & Computer Engineering
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The Arduino Uno is an open-source hardware design, single-board microcontroller, Arduino based on the ATmega8, ATmega168, or ATmega328 microcontroller developed by Atmel. While currently the Arduino Uno is generally shipped with ATmega328, it is compatible with the 8 or 168 ATmega versions without modifications, including the pin configuration.
The Arduino Uno is currently on its third revision.
Revision 3
In revision 3, the ATmega8U chip that was responsible for the USB communication was replaced by the ATmega16U, doubling the flash memory to 16kB from 8kB. The reset button has been moved from the center of the board to the corner right next to the USB connector.
Programming
Programming on the Ardunio Uno, like all the other Ardunio boards can be done using C and the Arduino standard libraries.
Pinout
The board includes 13 multi-purpose digital pins and 6 multi-purpose analog pins.[1]
| Pin | Name | Description |
|---|---|---|
| 0 | RX | Receive TTL serial data |
| 1 | TX | Transmit TTL serial data |
| 2 | External interrupt, digital pin | |
| 3 | External interrupt, PWD, digital pin | |
| 4 | digital pin | |
| 5 | PWM, digital pin | |
| 6 | PWM, digital pin | |
| 7 | digital pin | |
| 8 | digital pin | |
| 9 | PWM, digital pin | |
| 10 | SS | PWM, digital pin, SPI SS (Slave Select) pin |
| 11 | MISI | PWM, digital pin, SPI MOSI (Master Out Slave In) pin |
| 12 | MOSI | digital pin, SPI MISO (Master In Slave Out) pin |
| 13 | LED/SCK | Built-in LED, digital pin, SPI SCK (Serial Clock) pin |
| A0 | Analog pin | |
| A1 | Analog pin | |
| A2 | Analog pin | |
| A3 | Analog pin | |
| A4 | SDA | Analog pin, I²C SDA (Serial Data Line) pin |
| A5 | SCL | Analog pin, I²C SCL (Serial Clock) pin |
| AREF | AREF | Reference voltage for the analog inputs |
| Reset | Reset | Resets the microcontroller |