ARDUINO UNO R3 ATmega328P Rev 3.0 microUSB

This model is one of the varieties of the Arduino Uno R3 board, which is made according to the original Arduino documentation. The main differences between the boards are: the method of mounting the ATmega328P microcontroller (the board is made in the form of SMD mounting), the presence of SDA (Serial Data) and SCL (Serial Clock) outputs, and the built-in CH340G chip. In all other respects, the board matches the Arduino Uno controller. The Uno R3 also has 14 digital ports, 6 analog ports, a power jack, a microUSB port, and a reset button.

Chip CH340G designed by WCH, which serves to convert a computer USB interface into a serial UART interface, creating an additional UART port on the computer. The main advantages of this chip are: low price, compact package with a large number of pins and requires a minimum of external components.

The board can be powered via an external power connector or USB port. As an external power source, you can use a battery or a conventional electrical network. The battery is connected to the GND and VIN outputs, and the AC adapter to the power connector. The recommended supply voltage for the controller is 7 - 12 V, but the board starts working when 6 - 20 V is present.

Arduino Uno R3 has 3 types of memory: FLASH, SRAM, EEPROM. The platform has 32 KB of FLASH memory, where 2 KB is used for the bootloader, which stores programs. SRAM is a kind of random access memory that is used to store temporary data. EEPROM is a non-volatile memory that does not lose data in the absence of voltage.

There are 14 digital ports on the board, which you can use depending on your project. The voltage range of the outputs is 5 V. The outputs are rated for 40 mA, but it is recommended to limit the input and output currents to 20 mA. The ports also have internal resistances of 20 - 50 kOhm, which are disabled by default. The platform has 6 analog ports (A0 - A5) for connecting sensors that use analog signals. The AREEF pin is used to regulate the input voltage between ground and the 5V output.

For programming the microcontroller, the Arduino IDE software (which is a simplified version of the C ++ language) is used. This software development environment can be downloaded from the Arduino official website.

For further work with the Arduino Uno R3 board, you need to install drivers for the CH340G chip. Due to the popularity of this microcircuit, many personal computers already have drivers for it installed, but if the drivers are not installed, you can download them and then install them yourself.

The kit with the Arduino Uno R3 board includes pin extensions, but there is no USB cable for connecting to a computer. Extension cords are used, if necessary, to increase the contact pad of the microcontroller outputs. They are fixed on the board by soldering.

Arduino Uno-R3 Technical Parameters:

Microcontroller AtMega328-AU
Operating voltage, V 5
Input voltage (recommended), V 7 ... 12
Input voltage (limit), V 6 ... 20
Digital I/O 14 (6 of which can be used as PWM outputs)
Analog inputs 8
DC current through input/output, mA 40
DC output 3.3 V, mA 50
Flash memory 32 KB of which 0.5 KB is used for the bootloader
RAM, Kb 2
Non-volatile memory, Kb 1
Clock frequency, MHz 16.