Arduino - under this name combined several popular printed circuit boards, which have a standardized arrangement of all terminals for microcontrollers, as well as the same size within the boundaries of a product model. Some have additional elements that allow for control of the supply voltage supply and USB, which thanks to its versatility and can recharge the card, and use a microcontroller to communicate with a computer. One of the best variations of the family of these cards is the model of Arduino UNO R3.
General view of the board
The photo can be seen as the standard signature, inflicted in the manufacture of the board, and written using a graphical editor. The fact is that to work in the schemes used by all components, but since not all of them have been signed, had to correct this injustice. We now move on to the explanation of the schematic drawing, which is responsible for what on it. It is worth a good look at Arduino UNO R3, this payment scheme is shown in many books, manuals, but for completeness, the article is published here.
Below is shown the whole information will be provided in the form of a schematic drawing, which is very different from a visual image of the board. But these differences did not affect the quality of the printed circuit board, but you need to understand how it works, and you'll see that there is nothing complicated.
As the MC and the computer see each other
For correct functioning of the Arduino UNO R3 driver for it to be installed on the computer that runs the board. Selection of drivers depends on the operating system. There is a separate software to Arduino UNO R3: Driver Windows 7, Windows Vista and XP. That is, with the help of any equipment, which installed the operating system, you can work with the PCB. Arduino UNO R3 is compatible with all kompyuteramy issued with a zero.
Almost all visible leads are connected directly to the microcontroller. Some of these may be both accessible for connection, and the internal circuit is enabled. Conclusion USB can be used for the power supply voltage of 5 V, and to exchange information with a computer, which then recognizes the device as simultaneous serial port.
On the technical side, microcontroller computer and "chat" with him - it is also an asynchronous serial port, through which there is data exchange. Connect the Arduino UNO R3 own hands is not difficult, then the main zakovyka - to understand how the very process of data exchange, what are its characteristics. About this you can read on.
Power for the board
The operating voltage is 5 V, but input for external power supply is designed for 7-12 V. It was experimentally established that for lack of the minimum voltage of 6 V, and the maximum fee that can withstand - 20 Q. But it is better not to deviate from the recommended settings to avoid undesirable situations, such as the failure of the embodiments and the like, dependent on the supply voltage.
The power supply system is arranged in such a way that it automatically switches to the USB-ports to a different power source, if the latter submits more than 6.7 V. Such requirements are to provide voltage for Arduino UNO R3, connection and power supply circuit have been designed for optimum performance of the board.
The advantages of working with different voltages are not limited. Arduino UNO R3 board can be made to work on the MC and the lower (3.3V) voltage, but only due to the fact that he operates at a frequency of 8 Hz. The board also requires 16Hz and correspondingly higher voltage.
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