Design Ammendment:

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.

Package includes