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Serial.parseFloat()
Description
Serial.parseFloat() returns the first valid floating point number from the Serial buffer. parseFloat() is terminated by the first character that is not a floating point number. The function terminates if it times out (see Serial.setTimeout()).
Serial.parseFloat() inherits from the Stream utility class.
Syntax
Serial.parseFloat()
Serial.parseFloat(lookahead)
Serial.parseFloat(lookahead, ignore)
Parameter Values
- Serial: serial port object. See the list of available serial ports for each board on the Serial main page.
- lookahead: the mode used to look ahead in the stream for a floating point number. Allowed data types: LookaheadMode. Allowed lookahead values:
- SKIP_ALL: all characters other than a minus sign, decimal point, or digits are ignored when scanning the stream for a floating point number. This is the default mode.
- SKIP_NONE: Nothing is skipped, and the stream is not touched unless the first waiting character is valid.
- SKIP_WHITESPACE: Only tabs, spaces, line feeds, and carriage returns are skipped.
- ignore: used to skip the indicated char in the search. Used for example to skip thousands divider. Allowed data types: char
Return Values
- Data type: float.
Example Code
void setup() {
Serial.begin(9600);
}
void loop() {
if (Serial.available() > 0) {
float myFloat = Serial.parseFloat(SKIP_ALL, '\n');
// prints the received float number
Serial.print("I received: ");
Serial.println(myFloat);
}
}
- Compile and upload the above code to Arduino
- Open Serial Monitor and select Newline option
- Type -127.45 on Serial Monitor and click Send button:
COM6
Autoscroll
Clear output
9600 baud
Newline
- The result on Serial Monitor:
COM6
I received: -127.45
Autoscroll
Clear output
9600 baud
Newline
※ NOTES AND WARNINGS:
Serial functions are not only used for the communication between an Arduino board and Serial Monitor of Arduino IDE but also used for the communication between:
- An Arduino board and other Arduino board
- An Arduino board and other sensors/devices
- An Arduino board and computer (any Serial software on computer)* An Arduino board and other Arduino board
- An Arduino board and other sensors/devices
- An Arduino board and computer (any Serial software on computer)
See Also
- Language : Arduino - Serial
- Language : Serial.available()
- Language : Serial.availableForWrite()
- Language : Serial.begin()
- Language : Serial.end()
- Language : Serial.find()
- Language : Serial.findUntil()
- Language : Serial.flush()
- Language : Serial.getTimeout()
- Language : if(Serial)
- Language : Serial.parseInt()
- Language : Serial.peek()
- Language : Serial.print()
- Language : Serial.println()
- Language : Serial.read()
- Language : Serial.readBytes()
- Language : Serial.readBytesUntil()
- Language : Serial.readString()
- Language : Serial.readStringUntil()
- Language : serialEvent()
- Language : Serial.setTimeout()
- Language : Serial.write()
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| Arduino Starter Kit |
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