This UNO R3 kit is a microcontroller board based on the ATmega328P (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started. You can tinker with your UNO without worrying too much about doing something wrong, in the worst-case scenario you can replace the chip for a few dollars and start over again.

Design of Arduino UNO R3:

UNO R3 is an easy-to-use open-source controller newly launched in 2012.  Compared with UNO, the hardware has not changed much. The biggest difference lies in the USB to the serial circuit. An ATMega16U2 microcontroller is used instead, which also has a cost Improve, the software part is the same as before, without major changes.

Features:

1. Pin changes: Two I2C pins have been added next to the AREF pin (SDA and SCL, which are only copies of Analog 4 and 5, not additional I2C interfaces). In addition, two pins have been added next to RESET, one is IOREF. It can make the expansion board adapt to the onboard voltage. This pin only tells the current onboard voltage of the expansion board (for example, UNO is 5V, which can be regarded as a copy of the power pin and does not provide level pullup). Standby pin.

2. More stable RESET circuit. The position of the RESET key has also changed, and it has been moved to the corner of the board near the USB interface for easier pressing.

3. ATmega16U2 replaces 8U2, which does not mean that R3 with 16K flash can make your code run faster. This update is for the USB interface chip. In theory, it allows UNO to simulate USB HID, such as MIDI / Joystick / Keyboard.

 

Code Features:

1. Open circuit diagrams of the original design, development of the software interface for free download, can also be in accordance with the requirements and their modification, download the program simply and conveniently.
2. You can simply use Sensors, all kinds of electronic connection components (for example LED lights, buzzer, buttons, photoresistance, etc.), do all kinds of interesting work.
3. The microprocessor controller, which uses a high-speed development interface and the environment, is very simple and easy to understand, very suitable for beginners to learn.

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Microcontroller                                     ATmega328

Operating Voltage                                 5V

Input Voltage (recommended)          7-12V

Input Voltage (limits)                          6-20V

Digital I/O Pins                                    14 (of which 6 provide PWM output)

Analog Input                                         Pins6

DC Current per I/O Pin                      40 mA

DC Current for 3.3V Pin                     50 mA

Flash Memory                                      32 KB (ATmega328) of which 0.5 KB used by bootloader

SRAM                                                     2 KB (ATmega328)

EEPROM                                               1 KB (ATmega328)

Clock Speed                                           16 MHz

Length                                                    68.6 mm

Width                                                     53.4 mm

Weight                                                   25 g