Prints data to the serial port as human-readable ASCII text followed by a carriage return character (ASCII 13, or ' ∖r') and a newline character (ASCII 10, or '∖n'). Val: the value to print - any data type format: specifies the number base (for integral data types) or number of decimal places (for floating point types)īyte print() will return the number of bytes written, though reading that number is optional To send a single byte, use Serial.write(). You can pass flash-memory based strings to Serial.print() by wrapping them with F(). For floating point numbers, this parameter specifies the number of decimal places to use. Serial.print( “Hello world.”) gives “Hello world.”Īn optional second parameter specifies the base (format) to use permitted values are BIN (binary, or base 2), OCT (octal, or base 8), DEC (decimal, or base 10), HEX (hexadecimal, or base 16). Floats are similarly printed as ASCII digits, defaulting to two decimal places. Numbers are printed using an ASCII character for each digit. Prints data to the serial port as human-readable ASCII text. You can, however, specify other rates - for example, to communicate over pins 0 and 1 with a component that requires a particular baud rate. Sets the data rate in bits per second (baud) for serial data transmission. (Don't connect these pins directly to an RS232 serial port they operate at +/- 12V and can damage your Arduino board.) To use them to communicate with an external TTL serial device, connect the TX pin to your device's RX pin, the RX to your device's TX pin, and the ground of your MEGA 2560 to your device's ground. To use these pins to communicate with your personal computer, you will need an additional USB-to-serial adaptor, as they are not connected to the MEGA 2560's USB-to-serial adaptor. Click the serial monitor button in the toolbar and select the same baud rate used in the call to begin(). You can use the Arduino environment's built-in serial monitor to communicate with an Arduino board. Thus, if you use these functions, you cannot also use pins 0 and 1 for digital input or output. It communicates on digital pins 0 (RX) and 1 (TX) as well as with the computer via USB. All Arduino boards have at least one serial port (also known as a UART or USART). Used for communication between the Arduino board and a computer or other devices. The Arduino receiving data which send from PC, and then controlling an LED according to the received data, then return the state of LED to the PC's serial port monitor. In this lesson, we will program the Arduino MEGA 2560 to achieve function of send and receive data through the serial port.
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