ARDUINO UNO R3 ATmega328P Rev 3.0 USB-B

The Arduino platform is a development environment for electronic devices. This version of ARDUINO UNO R3 ATmega328P is a clone of ARDUINO UNO R3. The main differences between the boards are: the USB-UART interface converter (CH340G), the built-in ATmega328P microcontroller, the presence of additional connectors and the absence of a cable in the kit. The ARDUINO UNO R3 board is suitable for both beginners in this development environment and experienced radio technicians.

General characteristics:

This version of the ARDUINO UNO R3 board is designed based on the popular ATmega328P microcontroller. The ATmega328P controller has an SMD package, which makes it difficult to replace it in case of a malfunction. The CH340G chip is used as a USB-UART interface converter, which, when connected to a PC (personal computer), creates a virtual COM port. Also, the ARDUINO UNO R3 board has: a 14 MHz quartz resonator, a reset button, 14 digital outputs (inputs), 6 analog outputs, USB, indicators and other auxiliary electronic components. The microcontroller's memory consists of: 2 KB SRAM, 1 KB EEPROM and 32 KB Flash.

Connection:

The device can connect to the module using the I2C, SPI and UART interface. Also, one of the features of this board is the presence of sites for installing pin connectors for UART, I2C buses, digital and analog outputs. The board has an ISCP bus for connecting modules. The device board has a sufficiently large number of inputs and outputs to connect different modules. Device board pin assignments:

AREF: reference voltage of the built-in A/D converter
GND: ground
TX: signal transmission line (UART)
RX: signal receiving line (UART)
SS: Slave Pin (SPI)
MOSI: Master to Slave Data Transfer (SPI)
MISO: Slave to Master Data Transfer (SPI)
SCK: clock pulse (SPI)
D2 - D9: digital outputs (inputs)
A0 - A3: analog outputs
SCA: data line (I2C)
SCL: Bit Enabled (I2C)
Vin: external power supply voltage
5V: supply voltage 5V
3.3V: supply voltage 3.3V
RESET: reset the microcontroller
Device indication:

The board also has 4 LEDs:

L: Lights up when terminal D13 is working
RX: Lights up when receiving data
TX: reports data transmission
ON: lights up when voltage is applied to the board
Programming:

To work with the ARDUINO UNO R3 board, you need to download and install the Arduino IDE development environment manually. After installing it, you need to select a board, for this you need to open the program, select the "tools" menu item, then "board" and select ARDUINO UNO R3. In order to install the software into the memory of the microcontroller, it is necessary to connect the device to a PC (personal computer) using a wire and press the "download" button. Thanks to the CH340G chip, when connected to a PC, the Arduino board is defined as a COM port.

Reset:

If you need to reset the microcontroller software, briefly press the RESET button. You can also reset with the RES pin.

Device Power:

Power is supplied from a PC (USB connector) or an external power supply. The supply voltage range of the ARDUINO UNO R3 is 6 to 20 V (recommended 7 to 12 V). When working with a voltage less than 7V, it may cause a small voltage at the 5V output and unstable operation of the device. An external power source (accumulator, battery, etc.) is connected using a 5.5 x 2.1 mm power connector.

Device Specifications:

Supply voltage, V 6 ... 20
Microcontroller ATmega328P
Number of digital inputs (outputs) 14
Number of analog inputs 6
Permissible current strength of digital outputs, mA 20
Permissible output current 3.3V, mA 50
Clock frequency, MHz 16
Flash memory, KB 32
SRAM memory, KB 2
EEPROM, Kb 1
Board dimensions, mm 68 x 52