설명
Prints data to the serial port as human-readable ASCII text. This command can take many forms. Numbers are printed using an ASCII character for each digit. Floats are similarly printed as ASCII digits, defaulting to two decimal places. Bytes are sent as a single character. Characters and strings are sent as is. For example-
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Serial.print(78) gives "78"
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Serial.print(1.23456) gives "1.23"
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Serial.print('N') gives "N"
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Serial.print("Hello world.")
gives"Hello world."
An 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)
. For floating point numbers, this parameter specifies the number of decimal places to use. For example-
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Serial.print(78, BIN) gives "1001110"
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Serial.print(78, OCT) gives "116"
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Serial.print(78, DEC) gives "78"
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Serial.print(78, HEX) gives "4E"
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Serial.print(1.23456, 0) gives "1"
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Serial.print(1.23456, 2) gives "1.23"
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Serial.print(1.23456, 4) gives "1.2346"
You can pass flash-memory based strings to Serial.print() by wrapping them with F(). For example:
Serial.print(F(“Hello World”))
To send data without conversion to its representation as characterse, use Serial.write().
문법
Serial.print(val)
Serial.print(val, format)
매개변수
val
: the value to print - any data type
반환
size_t
: print()
returns the number of bytes written, though reading that number is optional.