![]() See this forum post for more information. Warning: We recommend not connecting the Arduino to USB while it is powered through VIN. More information about the Arduino Uno R3 is available on Arduino’s website. The reset button is now next to the USB connector, making it more accessible when a shield is used.There is a IOREF pin next to the reset pin, which is a duplicate of the 5V pin. The I2C pins (A4, A5) have been also been brought out on the side of the board near AREF. Three new pins were added, all of which are duplicates of previous pins.This does not increase the flash or RAM available to sketches. The USB controller chip changed from ATmega8U2 (8K flash) to ATmega16U2 (16K flash).This is the 3rd revision of the Uno (R3), which has a number of changes: breadboard, sensors, jumper wires, and LEDs) that make it possible to create a number of fun introductory projects. Note that we also offer a SparkFun Inventor’s Kit, which includes an Arduino Uno along with an assortment of components (e.g. you can easily make your Arduino wireless with our Wixel shield), making it a great introductory platform for embedded electronics. The Arduino has a large support community and an extensive set of support libraries and hardware add-on “ shields” (e.g. This auxiliary microcontroller has its own USB bootloader, which allows advanced users to reprogram it. Instead, it features an ATmega16U2 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 20 digital input/output pins (of which 6 can be used as PWM outputs and 6 can be used as analog inputs), a 16 MHz resonator, a USB connection, a power jack, an in-circuit system programming (ICSP) header, and a reset button. The Arduino Uno is a microcontroller board based on the ATmega328. ![]()
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