- USING THE ARDUINO SOFTWARE SERIAL LIBRARY SERIAL
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The converter IC is connected through 1 kΩ resistors.įragment of the Arduino UNO R3 board layout. To do this, the corresponding signals of the ATmega16U2 chip - a USB / UART interface converter are connected to the same signals (RX and TX).
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In addition to the function of communicating with other controllers, the UART port of the Arduino UNO board is used to download a program to the controller from a computer. Through these pins (0 and 1), you can connect another device with a UART interface to the board. Of course, it takes CPU resources.Īrduino UNO board has one UART port, the signals of which are connected to pins 0 (RX signal) and 1 (TX signal). In this case, all signals are generated by the program.
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Software data transfer via the UART protocol can also be implemented. When I use the expression hardware interface, I emphasize that there is an electronic node in the controller, into the register of which the program only loads bytes for transmission, and the formation of exchange signals and all other operations is done by this node. The Arduino Mega and Arduino Due boards each have three ports.
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And the TX signal of the second UART is connected to the RX input of the first one.Īny Arduino board has at least one hardware UART serial interface.
When two UART devices are connected, the TX output of one device is connected to the RX input of the other. For this, there are two signals in the UART interface: data transmission can occur simultaneously with recieving. Information is exchanged via UART in duplex mode, i.e. The following standard UART transmission rates are often used.
data is transmitted with the low bit forward.byte transmission ends with a stop bit (high level).transmission of a byte begins with a start bit (low level).in inactive mode, the UART output is in a high state.There are variants with a different number of data bits, synchronization bits, a parity bit, etc. The error of the time intervals for the transmission of bits should be no more than 5% (no more than 1.5% is recommended). Thus, to transfer a byte of information requires 10 bits, not 8. In addition to the data bits, the UART interface inserts synchronization bits into the stream: start and stop. The transmission rate is indicated in baud (bits per second). The transmission time of one bit is determined by the transmission rate.
USING THE ARDUINO SOFTWARE SERIAL LIBRARY CODE
UART data is transmitted by a serial code in the following format.Įach bit is transmitted at regular intervals. The UART is a Universal Asynchronous Receiver-Transmitter. Of course, the UART interface in Arduino can be used to communicate with other controllers or peripheral devices, but so far we are interested in it from the point of view of communication with a computer. Only instead of the Arduino IDE monitor, I sometimes use my programs that display data in a convenient form. This way of debugging suits me perfectly.
You can transfer to the computer any information about the state of the program and display it on the monitor. The Arduino IDE has a serial port monitor that allows you to receive and send exchange data with the board. Physical connection of the Arduino board to a computer via a USB cable always exists. This can be done by transmitting the necessary information to the computer via a serial interface. But the main function of debugging is to see the state of the program, to know the value of variables. The Internet describes many ways to debug programs that use additional libraries, programs, hardware adapters. Finding algorithmic and computational errors is much more difficult. Formal errors are detected during compilation. There are always mistakes when developing programs. The Arduino IDE does not have a debugger, which creates certain problems in finding program code errors. Previous lesson List of lessons Next lesson The lesson describes the Arduino board UART serial interface, the library for working with it, and the use of the UART port for debugging programs.