The pin configuration is identical on all three processors. Note: The Arduino reference design can use an Atmega8, 168, or 328, Current models use an ATmega328, but an Atmega8 is shown in the schematic for reference. Schematic: arduino-uno-Rev3-schematic.pdf The Uno is the latest in a series of USB Arduino boards, and the reference model for the Arduino platform for a comparison with previous versions, see the index of Arduino boards.ģ2 KB (ATmega328) of which 0.5 KB used by bootloaderĮAGLE files: arduino-uno-Rev3-reference-design.zip (NOTE: works with Eagle 6.0 and newer) The Uno and version 1.0 will be the reference versions of Arduino, moving forward. 'Uno' means one in Italian and is named to mark the upcoming release of Arduino 1.0. The second one is a not connected pin, that is reserved for future purposes. 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. 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. Revision 3 of the board has the following new features: Revision 2 of the Uno board has a resistor pulling the 8U2 HWB line to ground, making it easier to put into DFU mode. Instead, it features the Atmega16U2 (Atmega8U2 up to version R2) programmed as a USB-to-serial converter. The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. 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. 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.

Before you write your own sketch for this multi-function shield remember that most of its units are connected to +5 volts.The Arduino Uno is a microcontroller board based on the ATmega328 (datasheet). The first program in the microprocessor world is a blink sample. You can find links to these docs at the end of this post. Documentation is scarce, but the shield is simple and everything is visible and obvious.

I have dig the Internet and found the datasheet and some sample C-programs. Socket for temperature sensor LM35 or DS18B20Īlso you will find a connector with 4 free pins, 4 pins GND, and 4 pins with +5V. Socket for infrared receiver (remote control) It can be useful for advanced users because it has built-in general purpose components:Ĥ-digit 7-sement LED tube driven by 74HC595 The shield has a wide range of features which makes it perfect for beginners who want to study.

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Arduino uno r2 datasheet