Arduino Uno R3 Development Board ATmega328P With USB Cable

The power pins are as follows:

• The input voltage to the Arduino board when it’s using an external power source (as opposed to 5 volts from the USB connection or another regulated power source). You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin.
• This pin outputs a regulated 5V from the regulator on the board. The board can be supplied with power either from the DC power jack (7 – 12V), the USB connector (5V), or the VIN pin of the board (7-12V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. We don’t advise it.
• A 3.3-volt supply is generated by the onboard regulator. The maximum current draw is 50 mA.
• Ground pins.
• This pin on the Arduino board provides the voltage reference with which the microcontroller operates. A properly configured shield can read the IOREF pin voltage and select the appropriate power source or enable voltage translators on the outputs for working with the 5V or 3.3V.

How to Install the Arduino Uno R3 board drivers:

If you used the Installer, Windows – from XP up to 10 – will install drivers automatically as soon as you connect your board.

If you downloaded and expanded the Zip package or, for some reason, the board wasn’t properly recognized, please follow the procedure below.

• Click on the Start Menu, and open up the Control Panel.
• While in the Control Panel, navigate to System and Security. Next, click on System. Once the System window is up, open the Device Manager.
• Look under Ports (COM & LPT). You should see an open port named “Arduino UNO (COMxx)”. If there is no COM & LPT section, look under “Other Devices” for “Unknown Device”.
• Right-click on the “Arduino UNO (COmxx)” port and choose the “Update Driver Software” option.
• Next, choose the “Browse my computer for driver software” option.
• Finally, navigate to and select the driver file named “arduino.inf”, located in the “Drivers” folder of the Arduino Software download (not the “FTDI USB Drivers” sub-directory). If you are using an old version of the IDE (1.0.3 or older), choose the Uno driver file named “Arduino UNO.inf”
• Windows will finish up the driver installation from there.

Arduino Uno R3 Memory:

The ATmega328 has 32 KB (with 0.5 KB used for the bootloader). It also has 2 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library).

Automatic (Software) Reset / How to reset Arduino UNO board:

Rather than requiring a physical press of the reset button before an upload, the Arduino Uno is designed in a way that allows it to be reset by software running on a connected computer. One of the hardware flow control lines (DTR) of the ATmega8U2/16U2 is connected to the reset line of the ATmega328 via a 100 nano-farad capacitor. When this line is asserted (taken low), the reset line drops long enough to reset the chip. The Arduino software uses this capability to allow you to upload code by simply pressing the upload button in the Arduino environment. This means that the boot-loader can have a shorter timeout, as the lowering of DTR can be well-coordinated with the start of the upload.

This setup has other implications. When the Uno is connected to either a computer running Mac OS X or Linux, it resets each time a connection is made to it from software (via USB). For the following half-second or so, the boot-loader is running on the Uno. While it is a program to ignore malformed data (i.e. anything besides an upload of new code), it will intercept the first few bytes of data sent to the board after a connection is open. If a sketch running on the board receives a one-time configuration or other data when it first starts, makes sure that the software with which it communicates waits for a second after opening the connection and before sending this data.

The Uno R3 contains a trace that can be cut to disable the auto-reset. The pads on either side of the trace can be soldered together to re-enable it. It’s labeled “RESET-EN”. You may also be able to disable the auto-reset by connecting a 110-ohm resistor from 5V to the reset line;.

Programming / How to Program Arduino Uno Board:

The Uno R3 can be a program with Arduino software (download). Select “Arduino Uno from the Tools > Board menu (according to the microcontroller on your board). For details, see the reference and tutorials.

The ATmega328 on the Uno R3 comes pre-burn with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. It communicates using the original STK500 protocol.

You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header; see these instructions for details.

The ATmega16U2 (or 8U2 in the rev1 and rev2 boards) firmware source code is available. The ATmega16U2/8U2 is loaded with a DFU bootloader, which can be activated by:

On Rev1 boards: connecting the solder jumper on the back of the board (near the map of Italy) and then resetting the 8U2.

On Rev2 or later boards: there is a resistor that pulls the 8U2/16U2 HWB line to the ground, making it easier to put into DFU mode.

You can then use Atmel’s FLIP software (Windows) or the DFU programmer (Mac OS X and Linux) to load new firmware. Or you can use the ISP header with an external programmer (overwriting the DFU bootloader).

Input and Output / Arduino Uno board Pin Out:

Each of the 14 digital pins on the Uno can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. In addition, some pins have specialized functions:

• Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data. These pins are connected to the corresponding pins of the ATmega8U2 USB-to-TTL Serial chip.
• External Interrupts 2 and 3. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt() function for details.
• PWM: 3, 5, 6, 9, 10, and 11. Provide 8-bit PWM output with the analogWrite()
• SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK). These pins support SPI communication using the SPI library.
• LED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it’s off.

The Uno R3 has 6 analog inputs, labeled A0 through A5, each of which provides 10 bits of resolution (i.e. 1024 different values). By default, they measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the analogReference() function? Additionally, some pins have specialized functionality:

• TWI: A4 or SDA pin and A5 or SCL pin. Support TWI communication using the Wire library.

There are a couple of other pins on the board:

• A reference voltage for the analog inputs. Used with analogReference().
• Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields that block the one on the board.

See also the mapping between Arduino pins and ATmega328 ports. The mapping for the Atmega8, 168, and 328 is identical.

Vayuyaan believes in satisfied customers, so whatever the product is we first import them and then test them for their supplier-defined and standard capabilities. After all the possible quality checks, we make the product available to our customers.

Arduino Uno Features:

• pinout: added SDA and SCL pins that are near the AREF pin and two other new pins placed near the RESET pin, the IOREF that allow the shields to adapt to the voltage provided by the board. In the future, shields will be compatible with both the board that uses the AVR, which operates with 5V, and with the Arduino Due which operates with 3.3V. The second one is a not-connected pin, which is reserved for future purposes.
• Stronger RESET circuit.
• Atmega 16U2 replace the 8U2.
• Microcontroller: ATmega328P.
• Operating Voltage: 5V.
• Input Voltage: 7-12V.
• Digital I/O Pins: 14 (of which 6 provide PWM output).
• Analog Input Pins: 6.
• DC Current: 40mA.
• Flash Memory: 32 KB.
• SRAM: 2 KB.
• EEPROM: 1 KB.
• Clock Speed: 16 MHz.

Arduino Board Applications:

• DIY project2 t prototyping.
• Developing varied varieties of projects that require code-based control.
• Automation System development.
• Learning AVR programming.
• Entry-level circuit designing.

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